8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes : Forum / posts

Re: USB LED matrix

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 14:20:39 -0700

tsrhys wrote ...

Would serial be easy? Or easier or worth it?

easier ? .. much

easy? not for beginner , but you could do it in steps.. like mini projects.

First control a port to turn leds on and off.
Then learn how to use the serial port to issue commands
Learn how to drive a multiplexed display.
You will have learned a lot by the time it is working.

worth it? Only you can answer that

Re: Simpler PIC project help!

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 13:17:26 -0700

I think i got the IR trigger okay in my head
Transistor, IR diode, IR Sensitive diode, High resistance?
But as soon as we get to Micros and 7-seg im screwed

Re: USB LED matrix

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 13:13:16 -0700

Would serial be easy? Or easier or worth it?

In SIM548C i'm not getting Latitde and longitude info from $RMC string

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 12:31:36 -0700

Hi I'm using SIM548C GPS/GSM module. GPS is sending NMEA msg in all string format continuously but its not giving Latitude and longitude information.

$RMC Recommended Minimum Navigation Information

1 2 3 4 5 6 7 8 9 10 11|
| | | | | | | | | | | |
$--RMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,xxxx,x.x,a*hh
1) Time (UTC)
2) Status, V = Navigation receiver warning

In RMC format I'm getting status of "V" which means invalid or Navigation receiver warning. what to do to solve this problem?

Is't possible to query the GPS module as like GSM sending AT command?

problem with eeprom write.. plz help.....

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 11:24:06 -0700

i have been working on eeprom interfacing since last few days...
i successfully ran my project on proteus.... the eeprom read n write works fine....

but when i burnt my at89s52, the program didnt run on it as thought of... the eeprom write encounters some problems i dont know wat, but on reading back eeprom i get only garbage characters on lcd screen...
the problem seems to come after write data byte to eeprom, i dont seem to get ack from eeprom...
void mem_write(unsigned char value)
{
char j;
bitchar=value;
for(j=0;j<8;j++)
{
scl=0; // to clock in data
sda=msbc;
scl=1;
bitchar=bitchar<<1;
}
scl=0; // to receive ack from eeprom
scl=1;
scl=0;
delay(3);

}

the above code works fine in proteus but not in real project... i use pagewrite to write to eeprom.... plz help

Re: How to Interface Cell Phone to PIC/MCU

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 10:40:45 -0700

thank you very much sir...

i will post again if i have any troubled...

Re: help plz!..need 2 design a robot!

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 08:49:12 -0700

thankz..jz another quest..if the robot is to only carry weight of nt more than 60kg..i assume i would have to use a sensor for this rite?wat kinda sensor should i use?

Re: Two serial port microcontroller

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 07:27:17 -0700

I know that the C8051F34x family have two serial ports.

sorry for replying so late.
C8051F34x are controllers supported by SILabs.
they have in circuit programming facility through USB.
you can anyway order there programmer for production.

Re: Interface 8051 with a GPS module (EM-406a)

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 07:21:42 -0700

most gps have two o/ps
TTL and rs232

Electrical level : TTL level,Output voltage level :0-2.85V,RS-232 lvl

if you have a rs232 o/p.. then use
gps->max232->uC
and
gps<-max232<-uC
this will be the safest solution.

Re: Two serial port microcontroller

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 06:46:41 -0700

Ajay cant i use your software UART for 8 bit and actual UART for 9 bit?

Re: 8051 interfacing with GSM Nokia 6080 mobile

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 06:45:14 -0700

i dont know about XRAM, its just simple AT89S51 microcontroller.

Re: Help on my MCU project!!!!

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 05:59:46 -0700

well, i'm currently flushed-out of ideas...especially on what type of micro should i use......all i have now is the idea of making a module.... >:)

Re: Interface 8051 with a GPS module (EM-406a)

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 05:56:36 -0700

Nice thats the solution that i have in my mind Ajay
so R1 must be >= 0.75 * R2
my resistor invertory is so limit ..
i will use R2 = 261ohm and for R1=216 ohm with respect to above equation

but now another question arised and its about currents
i= 2,74 / 261 = 10,5 mA, should i use bigger resistors?
lets say i connect two 1K resistors in series with R1 and R2
R11=1K+R1 and R22=1K+R2 .

thanks

Re: qwerty keyboard redesign

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 05:55:31 -0700

no but i have do hv some idea about replacing some keys .... but don how to start and where to start so need some help!!!!!!!!!

Re: Help on my MCU project!!!!

contact@nospam.com (Ajay Bhargav) — Mon, 06 Jul 2009 04:11:32 -0700

what kind of help are you looking for?