Mastery chip

Porting ubuntu 13.10 on beagle board xm with GUI

masterychip@gmail.com (Anonymous) — Thu, 05 Dec 2013 14:11:00 +0000

Beagle board with GUI

Get prebuilt image:

wget https://rcn-ee.net/deb/rootfs/saucy/ubuntu-13.10-console-armhf-2013-11-15.tar.xz

Verify image with:

md5sum ubuntu-13.10-console-armhf-2013-11-15.tar.xz

8de42541ee3687d6a167878d4f873481 ubuntu-13.10-console-armhf-2013-11-15.tar.xz

Unpack image:

tar xJf ubuntu-13.10-console-armhf-2013-11-15.tar.xz

cd ubuntu-13.10-console-armhf-2013-11-15

If you don't know the location of your SD card:

sudo ./setup_sdcard.sh --probe-mmc

You should see something like

Are you sure? I don't see [/dev/idontknow], here is what I do see...

fdisk -l:

Disk /dev/sda: 500.1 GB, 500107862016 bytes <- x86 Root Drive

Disk /dev/sdd: 3957 MB, 3957325824 bytes <- MMC/SD card

lsblk:

NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT

sda      8:0    0 465.8G 0 disk

├─sda1   8:1    0 446.9G 0 part / <- x86 Root Partition

├─sda2   8:2    0     1K 0 part

└─sda5   8:5    0 18.9G 0 part [SWAP]

sdd      8:48   1   3.7G 0 disk

├─sdd1   8:49   1    64M 0 part

└─sdd2   8:50   1   3.6G 0 part

    In this example, we can see via mount, /dev/sda1 is the x86 rootfs, therefore /dev/sdd is the other drive in the system, which is the MMC/SD card that was inserted and should be used by ./setup_sdcard.sh...

1.   install image:
2.   Quick install script for "board"
3.   sudo ./setup_sdcard.sh --mmc /dev/sdX --uboot beagle_xm

Quick install script for "board" (using new --dtb option)

sudo ./setup_sdcard.sh --mmc /dev/sdX --dtb dt-beagle-xm

You should now be able to unmount the SD card from you PC, insert into your Board, reboot and have the OS loaded.

For a basic framebuffer driven desktop environment: (make sure network is setup):

Ethernet: "sudo ifconfig -a" and "sudo dhclient usb1" or "sudo dhclient eth0"

Then run:

/bin/sh /boot/uboot/tools/ubuntu/small-lxde-desktop.sh

Select any one of GUI listed below as per your need,

sudo apt-get install ubuntu-desktop

sudo apt-get install xubuntu-desktop

sudo apt-get install lubuntu-desktop

sudo apt-get install kubuntu-desktop

sudo apt-get -y install lxde lxde-core lxde-icon-theme

Keep in mind that lxde is light weight and its most preferable....

for more project info visit,

www.masterychip.com

reference

http://elinux.org/Beagleboard:Installing_LXDE

http://elinux.org/BeagleBoardUbuntu

Android Call Blocker

masterychip@gmail.com (Anonymous) — Thu, 03 Oct 2013 05:57:00 +0000

About

This application is block all incoming calls and send automatic busy message caller mobile. The automatic message based on user can edit or default busy message.

Specification

1. Eclipse IDE

2. Java 1.6

3. Android SDK for windows package

4. Android Smart phone(android 2.3.3 minimum)

Steps

1.The following steps to use for create an android call blocker application

1. First create a new Android project

12. Create the following 2 Java class

MainActivity.java

package call.control;

import java.lang.reflect.InvocationTargetException;

import com.android.internal.telephony.ITelephony;

import java.lang.reflect.Method;

import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.graphics.Color;

import android.os.Bundle;

import android.os.RemoteException;

import android.telephony.PhoneStateListener;

import android.telephony.TelephonyManager;

import android.telephony.gsm.~~SmsManager~~;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.CompoundButton;

import android.widget.EditText;

import android.widget.Toast;

import android.widget.ToggleButton;

import android.widget.CompoundButton.OnCheckedChangeListener;

public class MainActivity extends Activity{

ToggleButton blockAll_cb;

Button b1,b2;

BroadcastReceiver CallBlocker;

TelephonyManager telephonyManager;

ITelephony telephonyService;

EditText t1;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

t1=(EditText)findViewById(R.id.T1);

b1=(Button)findViewById(R.id.b1);

b2=(Button)findViewById(R.id.b2);

b1.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View arg0) {

t1.setText("");

}});

b2.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View arg0) {

finish();

}});

initviews();

blockAll_cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override

public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

blockAll_cb.setTextColor(Color.RED);

CallBlocker =new BroadcastReceiver(){

@Override

public void onReceive(Context context, Intent intent) {

telephonyManager = TelephonyManager)context.getSystemService

(Context.TELEPHONY_SERVICE);

Class c = null;

try{

c = Class.forName(telephonyManager.getClass().getName());

}

catch (ClassNotFoundException e) {

e.printStackTrace();

}

Method m = null;

try{

m = c.getDeclaredMethod("getITelephony");

}

catch (SecurityException e) {

e.printStackTrace();

}

catch (NoSuchMethodException e) {

e.printStackTrace();

}

m.setAccessible(true);

try {

telephonyService = (ITelephony)m.invoke(telephonyManager);

}

catch (IllegalArgumentException e) {

e.printStackTrace();

}

catch (IllegalAccessException e) {

e.printStackTrace();

}

catch (InvocationTargetException e) {

e.printStackTrace();

}

telephonyManager.listen(callBlockListener, PhoneStateListener.LISTEN_CALL_STATE);

}

PhoneStateListener callBlockListener = new PhoneStateListener(){

public void onCallStateChanged(int state, String incomingNumber){

if(state==TelephonyManager.CALL_STATE_RINGING){

if(blockAll_cb.isChecked()){

try{

String s=t1.getEditableText().toString();

telephonyService.endCall(); Toast.makeText(getBaseContext(), "Incoming Call No : "+incomingNumber,Toast.LENGTH_LONG).show();

String s1="Busy Now Call You Later";

if(s.length()>0){

~~SmsManager~~ sms=~~SmsManager~~.getDefault();

sms.sendTextMessage(incomingNumber, null, s, null, null);

}

else{

~~SmsManager~~ sms=~~SmsManager~~.getDefault();

sms.sendTextMessage(incomingNumber, null, s1, null, null);

}}

catch (RemoteException e) {

e.printStackTrace();

}}}}};};

IntentFilter filter= new IntentFilter("android.intent.action.PHONE_STATE");

registerReceiver(CallBlocker, filter);

}});}

public void initviews(){

blockAll_cb=(ToggleButton)findViewById(R.id.cbBlockAll);

blockAll_cb.setTextColor(Color.RED);

}

@Override

protected void onDestroy() {

super.onDestroy();

if (CallBlocker != null){

unregisterReceiver(CallBlocker);

CallBlocker = null;

}}}

MyStartupIntentReceiver.java

package call.control;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

public class MyStartupIntentReceiver extends BroadcastReceiver

{

@Override

public void onReceive(Context context, Intent intent)

{

Intent i = new Intent(context, MainActivity.class);

i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

context.startActivity(i);

}

3. Create the 2 layouts

Main.xml

________________________________________________________________________________

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="@drawable/frame"

android:orientation="vertical"

android:padding="20px" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text=""

android:textAppearance="?android:attr/textAppearanceMedium" />

<LinearLayout

android:id="@+id/linearLayout1"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="@drawable/frame"

android:padding="20px" >

<ToggleButton

android:id="@+id/cbBlockAll"

android:layout_width="wrap_content"

android:layout_height="66dp"

android:layout_weight="0.01"

android:background="@drawable/frame"

android:padding="16px"

android:textOff="OFF"

android:textOn="ON"

android:textStyle="bold" >

</ToggleButton>

<TextView

android:id="@+id/textView2"

android:layout_width="20dp"

android:layout_height="wrap_content"

android:text=""

android:textAppearance="?android:attr/textAppearanceSmall" />

<TextView

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:background="@drawable/frame"

android:padding="16px"

android:text="Block all Calls"

android:textColor="#FF0000" />

</LinearLayout>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text=""

android:textAppearance="?android:attr/textAppearanceMedium" />

<EditText

android:id="@+id/T1"

android:padding="16px" android:background="@drawable/frame"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginBottom="20dip"

android:layout_marginTop="5dip"

android:textColor="#ff0000"

android:singleLine="true" >

</EditText>

<LinearLayout

android:id="@+id/linearLayout2"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_weight="0.06"

android:gravity="center"

android:padding="20px" android:background="@drawable/frame" >

<Button

android:id="@+id/b1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="10dip"

android:background="@drawable/frame"

android:padding="16px"

android:text="Clear"

android:textColor="#FF0000" >

</Button>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:gravity="center"

android:width="10px" />

<Button

android:id="@+id/b2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="10dip"

android:background="@drawable/frame"

android:padding="16px"

android:text="Exit"

android:textColor="#FF0000" >

</Button>

</LinearLayout>

_______________________________________________________________________

Frame.xml

<?xml version="1.0" encoding="utf-8"?>

</shape>

4. Edit the android manifest file

Androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

android:versionCode="1"

android:versionName="1.0" package="call.control">

<uses-permission android:name="android.permission.SEND_SMS"></uses-permission>

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

<activity android:name=".MainActivity"

android:label="@string/app_name">

<intent-filter>

</intent-filter>

</activity>

<receiver android:enabled="true" android:name=".MyStartupIntentReceiver"

android:permission="android.permission.RECEIVE_BOOT_COMPLETED">

<intent-filter>

</intent-filter>

</receiver>

</application>

<uses-sdk android:minSdkVersion="3" />

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

<uses-permission android:name="android.permission.MODIFY_PHONE_STATE"/>

<uses-permission android:name="android.permission.CALL_PHONE"/>

</manifest>

5. Sample output

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+91-9500087478

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Mail : projects@masterychip.com

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Porting Ubuntu 12.10 (quantal) on beagle board Xm Rev C

masterychip@gmail.com (Anonymous) — Wed, 11 Sep 2013 13:05:00 +0000

Installing Ubuntu 12.10(quantal) on beagle board Xm Rev C

This post is about installing Ubuntu on a hardware box with embedded Linux. Below I am logging few steps how it was done. Overall, this effort is for me to learn how to set up an Ubuntu in beagle board xm

Hardware:

Beagle Board xM (rev C)
micro SD card (4GB minimum but 8GB preferred)

Software: Ubuntu Linux kernel 3.8.13

This blog assumes that its reader has a good deal of knowledge about using and installing Linux software.

Make sure that you are a root user..

You need to prepare a root file system in the Micro SD card, so you have to connect it to Linux host PC (Am using ubuntu 12.04).

sudo apt-get update

wget https://rcn-ee.net/deb/rootfs/quantal/ubuntu-12.10-console-armhf-2013-08-24.tar.xz

Verify image with:

md5sum ubuntu-12.10-console-armhf-2013-08-24.tar.xz

the expected response is

1d8c4999592123fdd3a51864394ccb49 ubuntu-12.10-console-armhf-2013-08-24.tar.xz

Unpack image:

tar xJf ubuntu-12.10-console-armhf-2013-08-24.tar.xz

cd ubuntu-12.10-console-armhf-2013-08-24

Connect the micro SD card to host PC

sudo ./setup_sdcard.sh --mmc /dev/sdX --uboot beagle_xm

if you don’t know the sdX value

sudo ./setup_sdcard.sh --probe-mmc

You should see something like

Are you sure? I don't see [/dev/idontknow], here is what I do see...

fdisk -l:

Disk /dev/sda: 500.1 GB, 500107862016 bytes <- x86 Root Drive

Disk /dev/sdd: 3957 MB, 3957325824 bytes <- MMC/SD card

lsblk:

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

sda 8:0 0 465.8G 0 disk

├─sda1 8:1 0 446.9G 0 part / <- x86 Root Partition

├─sda2 8:2 0 1K 0 part

└─sda5 8:5 0 18.9G 0 part [SWAP]

sdd 8:48 1 3.7G 0 disk

├─sdd1 8:49 1 64M 0 part

└─sdd2 8:50 1 3.6G 0 part

In this example, we can see via mount, /dev/sda1 is the x86 rootfs, therefore /dev/sdd is the other drive in the system, which is the MMC/SD card that was inserted and should be used by

 ./setup_sdcard.sh

Install image f or the Beagle Board xM:

sudo ./setup_sdcard.sh --mmc /dev/sdX --uboot beagle_xm

 After card preparation you can see the user name and password for that   kernel... and also you can see that SD card as two different drives and the      windows can detect only one in that... connect the SD card to beagle board xm.   You can  find the booting scripts of Ubuntu in UART (115200N81)or HDMI monitor if connected.

Default
Username: ubuntu
Password: temppwd


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                   +91-9500087478

Web    :       www.masterychip.com

Mail     :       projects@masterychip.com



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FM Telephone (Wireless mic)

masterychip@gmail.com (Anonymous) — Thu, 05 Sep 2013 16:23:00 +0000

FM Transmitter
A personal FM transmitter is a low-power FM radio transmitter which purpose is to allow music or other audio content from a portable media player, CD player or other portable audio system to be played through a nearby FM radio. It can either be a capability built into a portable media player, or a portable appliance that plugs into the headphone jack or proprietary output port of a portable media player or video device. The sound is then broadcast through the transmitter on an FM broadcast band frequency and picked up by the receiver. The purpose is generally to allow portable audio devices to make use of the better sound quality of a home audio system or car stereo without requiring a wired connection between them. Often called simply an FM transmitter, it is a low power device that should not be confused with high powered commercial FM broadcasting transmitters.

Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (except the dial tone) to any FM radio. The frequency can be tuned from 88 to about 94Mhz and the range is about 200 feet. It is extremely easy to build and is therefore a good, useful beginner project.

Parts

R1 180 Ohm 1/4 W Resistor
R2 12K 1/4 W Resistor
C1 330pF Capacitor
C2 12pF Capacitor
C3 471pF Capacitor
C4 22pF Capacitor
Q1 2SA933 Transistor
D1, D2, D3, D4 1SS119 Silicon Diode
D5 Red LED
S1 SPDT Switch
L1 Tuning Coil
MISC Wire, Circuit Board

Notes

1. L1 is 7 turns of 22 AWG wire wound on a 9/64 drill bit. You may need to experiment with the number of turns.
2. By stretching and compressing the coils of L1, you can change the frequency of the transmitter. The min frequency is about 88 Mhz, while the max frequency is around 94 Mhz.
3. The green wire from the phone line goes to IN1. The red wire from the phone line goes to IN2. The green wire from OUT1 goes to the phone(s), as well as the red wire from OUT2.
4. The antenna is a piece of thin (22 AWG) wire about 5 inches long.
5. All capacitors are rated for 250V or greater.
6. The transmitter is powered by the phone line and is on only when the phone is in use. S1 can be used to turn the transmitter off if it is not needed.
7. If you have problems with the LED burning out, then add a 300 ohm 1/4W resistor in series with it.

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POWER ELECTRONICS GETTING STARTED RECTIFIER

masterychip@gmail.com (Anonymous) — Fri, 30 Aug 2013 17:33:00 +0000

Types of Converters in Power Eletronics

1. AC-DC CONVERTER
2. DC-AC CONVERTER
3. DC-DC CONVERTER
4. AC-AC CONVERTER

AC-DC CONVERTER:

1.Diode Rectiﬁers

Introduction:

Rectifier is concerned with the application and design of diode rectiﬁer circuits. It covers single-phase, three-phase,poly-phase and high-frequency rectiﬁer circuits.

Theobjectives of this chapter are:

To enable readers to understand the operation of typical rectiﬁer circuits.
To enable readers to appreciate the different qualities of rectiﬁers required for different applications.
To enable the reader to design practical rectiﬁer circuits.

Single-Phase Diode Rectiﬁers

There are two types of single-phase diode rectiﬁer that convert a single-phase ac supply into a dc voltage, namely, single-phase half-wave rectiﬁers and single-phase full-wave rectiﬁers. In the following subsections, the operations of these rectiﬁer circuits are examined and their performances are analyzed and compared in tabular form. For the sake of simplicity the diodes are considered to be ideal, that is, they have zero forward voltage drop and reverse recovery time. This assumption is generally valid for the case of diode rectiﬁers that use the mains, a low-frequency source, as the input, and when the forward voltage drop is small compared with the peak voltage of the mains. Furthermore, it is assumed that the load is purely

resistive such that load voltage and load current have similar waveforms.

Single-Phase Half-Wave Rectiﬁers

The simplest single-phase diode rectiﬁer is the single-phase half-wave rectiﬁer. A single-phase half-wave rectiﬁer with resistive load. The circuit consists of only one diode that is usually fed with a transformer second-ary as shown. During the positive half-cycle of the transformer secondary voltage, diode D conducts. During the negative half-cycle, diode D stops conducting. Assuming that the transformer has zero internal impedance and provides perfect sinusoidal voltage on its secondary winding, the voltage and current waveforms of resistive load R and the voltage wave-form of diode D are shown in Figure. By observing the voltage waveform of diode D in Figures, it is clear that the peak inverse voltage (PIV) of diode D is equal to Vm during the negative half-cycle of the transformer secondary voltage. Hence the Peak Repetitive Reverse Voltage (VRRM) rating of diode D must be chosen to be higher than Vm to avoid reverse breakdown. In the positive half-cycle of the transformer second-ary voltage, diode D has a forward current which is equal to the load current and, therefore, the Peak Repetitive Forward Current (IFRM) rating of diode D must be chosen to be higher than the peak load current Vm=R, in practice. In addition, the transfor-mer has to carry a dc current that may result in a dc saturationproblem of the transformer core.

Thanks for saravanan for this valuable post

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+91-9500087478

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Getting started with labview

masterychip@gmail.com (Anonymous) — Tue, 27 Aug 2013 12:51:00 +0000

Lab-view (Laboratory Virtual Instrument Engineering Workbench) is a graphical programming language that uses icons instead of lines of text to create applications. In contrast to text-based programming languages, where instructions determine the order of program execution, Lab-view uses data flow programming, where the flow of data through the nodes on the block diagram determines the execution order of the VI's and functions. VI's, or virtual instruments, is Lab-view programs that imitate physical instruments.

Lab-view programs are called virtual instruments, or VI's, because their appearance and operation imitate physical instruments, such as oscilloscopes and multi meters. Lab-view contains a comprehensive set of tools for acquiring, analyzing, displaying, and storing data, as well as tools to help you troubleshoot code you write.

In Lab-view, you build a user interface by using a set of tools and objects. The user interface is known as the front panel. After you build the front panel, you add code using graphical representations of functions to control the front panel objects. You add this graphical code, also known as G code or block diagram code, to the block diagram. In some ways, the block diagram resembles a flowchart.

In Lab-view, you build a user interface, or front panel, with controls and indicators. Controls are knobs, push buttons, dials, and other input mechanisms. Indicators are graphs, LED's, and other output displays. After you build the user interface, you add code using VI's and structures to control the front panel objects.

Overview of lab-view and its tools:

Lab-view programs are called virtual instruments (VI's).Each VI contains three main parts:

• Front Panel – How the user interacts with the VI.
• Block Diagram – The code that controls the program.
• Icon/Connector – Means of connecting a VI to other VI's.

Front panel:

The Front Panel is used to interact with the user when the program is running. Users can control the program, change inputs, and see data updated in real time. Stress that controls are used for inputs- adjusting a slide control to set an alarm value, turning a switch on or off, or stopping a program. Indicators are used as outputs. Thermometers, lights, and other indicators indicate values from the program. These may include data, program states, and other information.
Every front panel control or indicator has a corresponding terminal on the block diagram. When a VI is run, values from controls flow through the block diagram, where they are used in the functions on the diagram, and the results are passed into other functions or indicators.

Block diagram:

After you build the front panel, you add code using graphical representations of functions to control the front panel objects. The block diagram contains this graphical source code, also known as G code or block diagram code. Front panel objects appear as terminals on the block diagram.

Icon/Connector:

After you build a VI front panel and block diagram, build the icon and the connector pane so you can use the VI as a sub VI. The icon and connector pane correspond to the function prototype in text-based programming languages. Every VI displays an icon, such as the one shown as follows, in the upper right corner of the front panel and block diagram windows..

A VI icon is a graphical representation of a VI. It can contain text, images, or a combination of both. If you use a VI as a sub VI, the icon identifies the sub VI on the block diagram of the VI. If you add the VI to the palette, the VI icon also appears on the Functions palette. You can double-click the icon in the front panel window or block diagram window to customize or edit it.

You also need to build a connector pane, shown as follows, to use the VI as a sub VI.

The connector pane is a set of terminals that correspond to the controls and indicators of that VI, similar to the parameter list of a function call in text-based programming languages. The connector pane defines the inputs and outputs you can wire to the VI so you can use it as a sub VI. A connector pane receives data at its input terminals and passes the data to the block diagram code through the front panel controls and receives the results at its output terminals from the front panel indicators.

Tools palette:

If Automatic tool selection is enabled and you move the cursor over objects on the front panel or block diagram, Lab-view automatically selects the corresponding tool from the Tools palette. Toggle automatic tool selection by clicking the Automatic Tool Selection button in the Tools palette or by pressing the <Shift-Tab> keys. In this class we will discuss the four most common tools in Lab-view: The Operating, Positioning/Re-sizing, Labeling, and Wiring Tools.

Use the Operating tool to change the values of a control or select the text within a control.

Use the Positioning tool to select, move, or re-size objects. The Positioning tool changes shape when it moves over a corner of a re-sizable object.

Use the Labeling tool to edit text and create free labels.The Labeling tool changes to a cursor when you create free labels.

Use the Wiring tool to wire objects together on the block diagram.

When automatic tool selection is disabled, you can alternate among tools on the Tools palette, by pressing the <Tab> key. To toggle between the Positioning and Wiring tools on the block diagram or the Positioning and Operating tools on the front panel, press the space bar.

Status toolbar:

Click the Run button to run the VI. While the VI runs, the Run button appears with a black arrow if the VI is a top-level VI, meaning it has no callers and therefore is not a sub VI.

Click the Continuous Run button to run the VI until you abort or pause it. You also can click the button again to disable continuous running.

While the VI runs, the Abort Execution button appears. Click this button to stop the VI immediately.

Note: Avoid using the Abort Execution button to stop a VI. Either let the VI complete its data flow or design a method to stop the VI programmatically. By doing so, the VI is at a known state. For example, place a button on the front panel that stops the VI when you click it.

Click the Pause button to pause a running VI. When you click the Pause button, Lab-view highlights on the block diagram the location where you paused execution. Click the Pause button again to continue running the VI.

Select the Text Settings pull-down menu to change the font settings for the VI, including size, style, and color.

Select the Align Objects pull-down menu to align objects along axes, including vertical, top edge, left, and so on.

Select the Distribute Objects pull-down menu to space objects evenly, including gaps, compression, and so on.

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Smart phone controlled smart car

masterychip@gmail.com (Anonymous) — Mon, 26 Aug 2013 12:57:00 +0000

I built a wireless robotics platform from a cheap R/C car, an 8051 micro-controller with Bluetooth module, and a Processing program running on a micro-controller to control the vehicle. The vehicle is completely controlled by android smart phone which allows very rapid prototyping of the code to tell the vehicle what to do and how to react to the commands from android smart phone via Bluetooth. I’m hoping this is a good way to teach to 9-year old boy about programming.

It’s the most basic example of adding small intelligence to a robot, but it’s actually the designer’s intelligence!!

Before I get into details, here’s an overview of the features:

All logic controlling the vehicle is performed in a Processing program running on android mobile phone. The microcontroller program listens for commands from the android phone.

Bi-directional wireless communication performs over a Bluetooth protocol. It’s as simple as connecting the RX/TX pairs together, and giving it power. This vehicle has two 12Vmotors with 3 control signals namely, forward, right and left

An android smart phone consists of an application to control the car using built-in Bluetooth

Inside the vehicle is a simple relay circuit board with microcontroller board and Bluetooth. The 12V dc motor of 100 rpm is used in this smart car

Power: Vehicle motors, 8051 microcontroller, relay circuit and Bluetooth module powered by 12V 7.5 ah lead acid battery.

The final smart car driving at night....................

LIGHT EMITTING DIODE Interfacing tutorial

masterychip@gmail.com (Anonymous) — Mon, 26 Aug 2013 12:02:00 +0000

Light Emitting Diodes (LED) is the most commonly used electronic components, generally for display digital states. Typical uses of LED's include alarm devices, timers and confirmation of user input such as a mouse click or keystroke, events etc. LED's are very cheap and easily available in a variety of shape, size and colors.

89C51, which belongs to the family of 8051 series of micro-controllers is very commonly used by a large community of hobbyist and engineers. Its simplicity and ease of programming with inbuilt features easily makes its position in the top preferred list of micro-controller for both beginners and advanced user.
To connect a led refer the methods of connection here

You can use 10-15 mA as a safe LED current which will provide decent light intensity and conserve battery power. Determine the Series resistor using Ohms law with an excess voltage value and current value for LED. Red LED's generally need 1.5V to 1.9V to light any extra voltage must be dropped with a series resistor else the LED will draw extra current in an attempt to lower the supply voltage down to the 1.5V level. The typical supply voltage source for micro-controller is 5V.

Then, 5 - 1.7 = 3.3V of excess voltage.
Let’s design the LED to use 10mA
Ohms law Resistance R = V / I
3.3 / 10mA = 330 Ohms, Place a 330 ohm resistor in series with the LED.

Circuit Diagram

Software Tools

1. RIDE Compiler (Evaluation version)
2. WINISP Downloader (Free version )

Program

//http://embedmastery.blogspot.in/

#include

sbit led=P1^1; //declaration

void delay();

void main()
{
led=0; //led connected in the port P1.1 made to off
delay();
led=1; //led connected in the port P1.1 made to on
delay();
}

void delay()
{
int i=0;
for(i=0;i<50000;i++);
}

Interfacing Switch and LED with 8051

masterychip@gmail.com (Anonymous) — Mon, 26 Aug 2013 10:58:00 +0000

Interfacing Switch and LED with 8051

This article is meant for beginners in the field of micro-controllers When I started with micro-controllers as everyone I also need to learn how to interface a switch with micro-controller.

A switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another. A switch may be directly manipulated by a human as a control signal to a system, or to control power flow in a circuit.

A switch requires a pull-up or pull-down resistor to produce a definite high or low voltage when it is open or closed. A resistor placed between a digital input and the supply voltage is called a "pull-up" resistor because it normally pulls the pin's voltage up to the supply.

Software Tools:

1. RIDE Compiler (Evaluation version)

2. WINISP Down loader (Free version )

Hardware:

1. P89C51

2. Push button switch

3. micro-controller board

Program:

#include<reg51.h>

sbit LED=P0^7; //port declaration

sbit SW1=P0^0;

sbit SW2=P0^1;

void main()

{

while(1)

{

if(SW1==0 || SW2==0) //if the SW1 or SW2 is pressed

{

LED=1;

}

else

LED=0;

}

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Sinking and Sourcing

masterychip@gmail.com (Anonymous) — Sat, 24 Aug 2013 10:20:00 +0000

Difference Between Sinking and Sourcing

Sinking and sourcing refer to the type of digital inputs and outputs used. A sinking digital I/O (input/output) provides a ground. A sourcing digital I/O provides a voltage source.

Consider a simple circuit that consists of one digital input connected to a digital output. The circuit needs a voltage source, a ground, and a load. A sourcing digital I/O provides the voltage needed for the circuit. A sinking digital I/O provides the ground needed in the circuit. The digital input provides the load required for the circuit to work.

Figure 1 shows a sinking digital output that is connected to a sourcing digital input. In this circuit, the sourcing digital input provides the voltage and the load. The sinking digital output controls the line by using a transistor to leave the line high (at +V) or to ground the line to 0 V.

Figure 2 shows a sourcing digital output that is connected to a sinking digital input. In this circuit, the sourcing digital output provides the voltage and the sinking digital input provides the load and the ground. The digital output controls the line by using a transistor to leave the line at 0 V or to raise the line to +V.

Because you need both a voltage source and a ground in order to create a complete circuit, you need to have a sourcing input or output connected to a sinking output or input. If you wish to connect a sourcing input to a sourcing output or a sinking input to a sinking output, you will need to add an additional resistor. For further information on connecting two I/O of the same type,

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LED Dot-matrix display

masterychip@gmail.com (Anonymous) — Thu, 22 Aug 2013 10:25:00 +0000

Driver MM5450

A dot-matrix display is a display device used to display information on machines, clocks and many other devices requiring a simple display device of limited resolution. Light emitting diodes aligned in a form of matrix constitute a dot matrix display. Arrangement of the LED's in the matrix pattern is made in either of the two ways: row anode-column cathode or row cathode-column anode. In row anode-column cathode pattern, the entire row is anode while all columns serve as cathode and vice-versa pattern is there in row cathode-column anode.

A dot matrix controller converts instructions from a processor or controller into signals which turns on or off lights in the matrix so that the required display is produced. We covered how to interface seven segment LED displays to a micro-controller Today, we will move on to interfacing an LED dot matrix display. LED dot matrices are very popular means of displaying information as it allows both static and animated text and images.

Perhaps, you have encountered them at gas stations displaying the gas prices, or in the public places and alongside highways, displaying advertisements on large dot matrix panels. In this experiment, we will discuss about the basic structure of a monochrome (single color LED dot matrix and its interface with a micro-controller to display static characters and symbols. I am using the 89C51 micro-controller on for demonstration, but this technique is applicable to any other micro-controllers that have sufficient I/O pins to drive the LED matrix driver MM5450 through SPI protocol.

Click Here to watch youtube video

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Open access of Non IEEE and Conference papers

masterychip@gmail.com (Anonymous) — Sat, 13 Jul 2013 11:24:00 +0000

Free white papers (Project papers)

I hope this section will very useful for you to do your final year project and hobbyist project with some new innovation by using open access papers. you can download free Non IEEE papers and Conference papers in the given link below..

http://www.hindawi.com/

http://www.scirp.org/journal/OpenAccess.aspx

http://www.dovepress.com/

http://www.doaj.org/doaj?uiLanguage=en

http://www.oajse.com/

http://www.academypublisher.com/

http://www.sersc.org/

http://www.educause.edu/

http://www.mdpi.com/

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Do It Yourself PCB methods

masterychip@gmail.com (Anonymous) — Wed, 10 Jul 2013 05:36:00 +0000

Make your own PCB.

DISCLAIMER: I know very little places about electronics world, so try this at your own risk...!

I surfed in internet for giving you a better making of PCB by DIY (Do it yourself) method and I have found out some of the methods. I hope it'll be more helpful for you to make better PCB at your own. Choose your own style method that's convenient for you and try with your own risk.Friends be careful while handling with chemicals.

Refer the following links

DIY PCB fabrication: MADE EASY!

How-To: Etch a single sided PCB

DIY PCB Manufacturing

PCB DIY

Etching In House

Easy PCB Fabrication using Laser Printer Toner Transfer method

DIY Surface Mount on a Budget

Best One-Off DIY PCB Creation Technique

How to make PCB's at home in 1 hour

Video Reference:

Best wishes...

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MJPG – video streamer on mini 6410 using UVC camera

masterychip@gmail.com (Anonymous) — Sat, 06 Jul 2013 06:11:00 +0000

MJPG – video streamer on mini 6410 using UVC camera

In this section we are going to learn about motion jpg streamer over a network (Either public or private). This section will not describe the complete part but it’ll give some idea about video streaming. I have used a friendlyarm mini6410 board. Refer below for more details about mini6410

you can use this project for surveillance system and medical monitoring

Hardware:

1. Friendlyarm Mini6410

2. Microsoft Lifecam VX-500

You can also choose from this list of camera's based on cost and requirement of your project

Software:

Choose Friendly arm Mini6410 board installed with Linux and qtopia GUI interface you can find the source code here

Final output is shown here

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Welcome to the Mastery Chip blog...

masterychip@gmail.com (Anonymous) — Fri, 05 Jul 2013 07:37:00 +0000

This blog make embedded systems design and development simple for the beginners and also for experts. It’ll be providing genuine and real-time embedded project experience to students and hobbyist and I am happy to guide the students for doing their final year projects and support students to make their innovative ideas come alive.

Embed mastery chip enables the students to do the real project work solutions and provide necessary training in that project, which are currently focusing the real industry. The architecture platform we provides for the project work will be tomorrows demanding technology trends in Industry indigenously developed by our Research & Development team effort.

Embed mastery chip is a trusted leader in providing IT, Embedded, VLSI solutions to Industries, Shops, Schools and Colleges. So we trying to make Embed mastery chip unique

We have vast experience in hardware design & firmware development works based on the following platforms......

89C51, PIC, 16F877, RF, I2C, SPI, CAN, USB, Embedded Web server, RF, Bluetooth, GSM, GPS, Zigbee, ARM7TDMI, MATLAB, LABVIEW, Power Electronics, Power Systems, Robotics, Bio-medical MEMS, VLSI, Fingerprint, Wireless Sensor Networking, Android, NS2 & Computer Applications etc...

Embedded Systems

Embedded Linux

VLSI

Power Electronics & Drives

Wireless Networking

Embedded Networking

Embedded Instrumentation

Medical Electronics

RTOS

Android Applications

Computer Applications

For project related query contact.

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