Into Robotics https://www.intorobotics.com ROS, Robots and Stuff Mon, 21 May 2018 12:05:41 +0000 en-US hourly 1 https://wordpress.org/?v=4.9.6 https://www.intorobotics.com/wp-content/uploads/2015/10/IR-LOGO-2013-75x75.png Into Robotics https://www.intorobotics.com 32 32 YDLIDAR F4 and G4 https://www.intorobotics.com/ydlidar-f4-and-g4/ https://www.intorobotics.com/ydlidar-f4-and-g4/#comments Tue, 17 Apr 2018 08:36:46 +0000 https://www.intorobotics.com/?p=12460 Read more →]]>  YDLIDAR Lidar F4 PRO

YDLIDAR Lidar F4 PRO

YDLIDAR F4 and G4 are two LIDAR (Light Detection and Ranging) sensors for environmental scanning, SLAM application… in other words, the sensors are designed for use in robot navigation.

The price range is $259.00 for F4 and $419.00 for G4. Both sensors are in direct competition with RPLidar A1M8(~$219.00) or RPLIDAR A2M6 (~$600.00).

I scan a little bit the specifications to see what is good and bad with these sensors:
the good

  • 12m scanning range (F4) and 16m scanning range(G4) – enough for autonomous robots in agriculture or construction fields;
  • both sensors include a safe low power infrared transmitter conforms to the FDA safety standard of Class 1 laser. This means that is safe to work with these sensors, the human eye is not affected;
  • only F4 uses a USB connection with a computer;
  • only F4 has complete drivers, supporting Windows, Android, ROS, and Linux system;

the bad

  • I try to find more information about who is the manufacturer. Their site is not completed and some links don’t work. The link to the Contact page will redirect you to something that can be called “About us”, while “About ydlidar” redirect to a 404 page. This could be interpreted as small details, but one question came into my mind – how this manufacturer will provide support and documentation for these sensors if they can not solve their own site problems?
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An ultrasonic sensor for dirty applications https://www.intorobotics.com/an-ultrasonic-sensor-for-dirty-applications/ https://www.intorobotics.com/an-ultrasonic-sensor-for-dirty-applications/#respond Sun, 08 Apr 2018 10:58:45 +0000 https://www.intorobotics.com/?p=12455 Read more →]]> 5V Waterproof Ultrasonic Module

5V Waterproof Ultrasonic Module

Now I build a 4WD outdoor robot and I was still thinking how to mount the Maxbotix’s ultrasonic sensors so that I don’t have problems with the dust and any other dirty things. Luckily, I discovered this waterproof sensor.

But there are some negative aspects. The sensor is blind for the first 25 centimeters and in many cases I have to deal with obstacles that may appear right in front of the robot (the wind pushes the tree branch in front of the robot).

As a positive side, the sensor is Arduino compatible and is working with 5V. The maximum range of the sensor is 4.5m, but some users seem to have some issue with the maximum distance. For me, a range of maximum 2 meters is much more than I would need. So, I should not worry about the maxim range.

Other important specifications:

  • resolution: 0.5cm;
  • it detects an obstacle at an angle less than 50 degrees;
  • acoustic emission frequency: 40khz;
  • pins: + 5V, Trig (control side) RX, Echo (the receiver) TX,
    GND (negative);

Otherwise, the sensor price is $14.99 without the cost of shipping.

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If you don’t have sensors … https://www.intorobotics.com/if-you-dont-have-sensors/ https://www.intorobotics.com/if-you-dont-have-sensors/#respond Fri, 06 Apr 2018 08:13:12 +0000 https://www.intorobotics.com/?p=12450 Read more →]]> use your smartphone to give your robot senses, so it can see where it’s going. Almost any smartphone – even a $30 device – is like a box with sensors. All these sensors can be used for a robot. A sensor like a camera to capture images, the accelerometer and gyro to drive the robot, and the pressure and proximity sensors for any other application.

Husarion, the company behind CORE2, has been developing an Android application that makes available the smartphone sensor readings through a ROS node.

The application is called hNode and creates a network between the smartphone, the robot, a laptop with ROS and the Husarion cloud.

I’m not sure, but to work in this way, most probably the robot should use the CORE2-ROS (running ROS) controller. More details here.

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4WD car chassis kit for outdoor adventures https://www.intorobotics.com/4wd-car-chassis-kit-for-outdoor-adventures/ https://www.intorobotics.com/4wd-car-chassis-kit-for-outdoor-adventures/#respond Thu, 05 Apr 2018 14:53:42 +0000 https://www.intorobotics.com/?p=12445 Read more →]]> Red High Power 4WD Smart Car Chassis Kit

Red High Power 4WD Smart Car Chassis Kit

I’ll start the description of the chassis from the wheels because I know what I’m talking about. I bought four similar wheels with non-inflatable rubber tire from eBay and I mounted them on a DIY mobile robot. The robot has a weight of around 10Kg (yes, two 12V sealed acid batteries). The wheels behaved quite well on uneven concrete. I did not get to test them on the grass because one of my motor axes has been broken.

Well, in other words, if the weight of the robot will not exceed 5-6 Kg, these wheels work very well on uneven concrete and most probably on grass. If you exceed this weight, when you turn around your robot, the rubber tire gives signs that would get off the rim.

The DC 12V motors are powerful enough to push the platform on almost any terrain. Without electronics and batteries, the platform weight around 2,2Kg. It is a big weight, but it must be taken into account that the chassis is made of iron.

Specification:

  • Power Supply Battery: 3.7v 18650*3 (NOT included)
  • Motor: 4pcs
  • Motor Voltage: DC 12V
  • Load current: 0.68A
  • Locked rotor current: 2.19A
  • Motor Speed: 300±10% (no-load) 245±10% (load)
  • Rated moment: 1.8kg.cm
  • Chassis Material: Iron
  • Color: Red
  • Motor size: 3.7*5.8cm/ 1.4*2.2inch
  • Output shaft size: 0.6*1.5cm
  • Wheel size: Dia :12.6cm/ 4.9inch width:5.9cm/2.3inch
  • Wheel Material: Rubber+plastic
  • Product Size: 27*27*12cm/ 10.6*10.6*4.7inch
  • Package Size: 38.5*29*6.5cm / 15.1*11.4*2.5inch
  • Gross Weight: 2255g/4.9 lb

The price of the chassis is $99.99 and not include the controller like Arduino or Raspberry Pi, the motor controller and the batteries.

If you don’t have plans to build an outdoor chassis from scratch, this metal chassis could be a solution for your project.

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Orange Pi 4G-IOT worth some attention https://www.intorobotics.com/orange-pi-4g-iot-worth-some-attention/ https://www.intorobotics.com/orange-pi-4g-iot-worth-some-attention/#comments Thu, 05 Apr 2018 08:38:21 +0000 https://www.intorobotics.com/?p=12441 Read more →]]>
Orange Pi 4G-IOT

Orange Pi 4G-IOT


This board is not designed with robotics in mind, but it could be helpful in some applications.

It has an ARM processor, Android OS, and Cellular connectivity. In other words, the board can run ROS and stay connected to the 4G Internet via nano-SIM. For most of us who build adventurous robots with an Internet connection, Orange Pi 4G-IOT can replace the Raspberry Pi board and a 4G USB dongle.

Also, the price is very attractive. On Aliexpress the board price is $45.00 – the price does not include the shipping costs.

I know that it’s about marketing, but about the fact that the board is open-source, I still do not understand how it would help me integrate it more easily into my projects or develop applications in another niche.

Regarding the features, the board supports sensors like accelerometer, fingerprint identification for security, IR control, camera, and touchscreen display.

Orange Pi 4G-IoT has a built-in Emmc memory with a capacity of 8GB. The memory space is enough to run the OS and some code, but it makes me nervous when I think that the board was designed for games and multimedia.

The full list of specifications:

Orange Pi 4G-IoT specifications:

  • SoC – Mediatek MT6737 quad-core Cortex A53 processor @ 1.1/1.3 GHz with Arm Mali-T720MP1 GPU
  • System Memory – 1GB DDR3
  • Storage – 8GB eMMC flash + micro SD slot
  • Video Output – HDMI, LCD display interface with touch panel support
  • Audio – 3.5mm earphone jack, built-in microphone
  • Cellular Connectivity

  • nano SIM card slot
  • “GSM” antenna + diversity antenna
  • 2G – GSM @ 850/900/1800/1900 MHz
  • WCDMA – B1/B2/B4/B5/B8
  • TD-CDMA
  • CDMA2000
  • LTE Cat 4
  • FDD-LTE – B1/B2/B3/B4/B7/B107/B20
  • TDD-LTE – B38/40/41B
  • Connectivity – WiFi, Bluetooth, FM, and GPS with antenna
  • Camera – 25-pin ZIF connector for 13MP camera
  • USB – 3x USB host ports, 1x micro USB port (only for flashing firmware)
  • Sensors – Accelerometer, fingerprint (how?)
  • Expansion – 40-pin header with 2x SPI, 3x I2C, 2x UART, 1.8V
  • Misc – IR receiver, power key, power and status LEDs
  • Power Supply – 5V/2A via power barrel jack; battery support through “weld plate”
  • Dimensions – 85 x 55 mm

source

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