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DC motor +Raspberry pi3+ROS

asked 2017-01-21 11:29:25 -0600

mr_0ptimist gravatar image

Hello everyone, I want to control simple dc motors using R-pi3 and Ros, Is it possible? Not enough tutorials are available!

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answered 2017-02-12 05:34:36 -0600

duck-development gravatar image

this https://www.sparkfun.com/products/9457 is also a nice motor drive an there is Raspberry Robot wich use it

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answered 2017-01-21 12:59:07 -0600

NEngelhard gravatar image

You will need a motor driver (like the DRV8835) and the corresponding driver library This gives you a python application that talks to the motors. Now add a bit of ROS and you have moving robot.

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I have a LM298 motor driver. IS the corresponding library available?

mr_0ptimist gravatar imagemr_0ptimist ( 2017-01-22 23:15:54 -0600 )edit

the Problem with the LM298 is that i use 5V Logic Voltage it can kill you PI.

duck-development gravatar imageduck-development ( 2017-02-12 05:26:53 -0600 )edit
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answered 2017-02-11 16:08:45 -0600

If the motor has <400 mA max current draw and you are ok with it turning one direction, you can use the Pi pin to directly drive the base pin of a 2222 NPN transistor to drive a motor. PWM via RPIO may even work in modulating the speed. It's a simple alternative to getting a motor driver.

Let me know if you have questions, happy to expand on details.

Cheers Jack

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answered 2017-01-22 09:44:38 -0600

updated 2017-01-22 15:00:09 -0600

It will depend on the DC motors. Are they brushed or brushless motors? What voltage is required? What amperage is required?

One option is to use an I2C PWM hat or shield and an electronic speed control (ESC) for each motor. This also allows up to 16 motors (more by combining shields).

The PWM + ESC allows for a wide range of voltages and amperages, depending on the ESC. Some common ESCs are 4.8-11V and 9-16v. There are some for even higher. ESCs are also rated by current units available for very high current such as 120A or more.

Here is documentation for an I2C PWM package for ROS: http://bradanlane.gitlab.io/ros-i2cpw...

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answered 2017-01-22 22:01:24 -0600

hmchung gravatar image

The simplest way I can think of: Hardware: RPi3 -> Arduino -> Speed Controller -> Motor Software: - In RPi3: rosserial - In Arduino: rosserial, servo_lib

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You might also consider ros_arduino_bridge. I've found that rosserial uses a lot of memory, so is not as appropriate for a 2Kb RAM Arduino. (Larger MCs like the Mega or Teensy should be fine with rosserial.)

Mark Rose gravatar imageMark Rose ( 2017-01-25 13:48:23 -0600 )edit

I use the rosserial with an Arduino Nano, it has merory to controll two Steppers, and the IMU may also work. but the arduino is near to full

duck-development gravatar imageduck-development ( 2017-02-12 05:29:23 -0600 )edit

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Asked: 2017-01-21 11:29:25 -0600

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Last updated: Feb 12 '17