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Is there a way to interface three or more Arduinos with a Raspberry Pi over i2c using Robot Operating System? I'm new to this. I see that the ROS rosserial protocol uses UART and that is for only two devices. Is there a way to chain Arduinos to a Raspberry Pi with ROS?
the pi has 4 usb ports so you connect those arduinos with usb cable . then starts 4 rosserial instances and you are a happy guy.
if you like to use i2c you have to programm a ros node witch handles the i2c to arduino communication and publisch the desired data to ros topics.
but an arduino side then there is no more ros specific code but only a i2c slave and you applicatioon code.
the rossrial way is the more generic, if you use this way.
srsly? One 8 Bit µC per USB port? I'm feeling very tired now.. This is really wasting a lot resources.
a hub is cheap and you have a power for the mc. it is the simples and and fastes way to solve your problem. ros is not the resource but time saver. for rapid prototyping.
I didn't understand how to ask the question properly at the time. I think what I was needing is to use multiple pi's connected over ros with each pi as its own node and connect arduinos to each node.
You can use one pi to connect multible arduino. If you use the USB connection of the arduino. It will work out of box.
hello, The Rosserial isn't restricted only for 2 two devices, please refer this,link text
Yes I see now that I was confused. Arduino Uno only has one serial port. That's why I can only talk between two devices. I see now with an Arduino Mega it has 4 serial ports.
Asked: 2020-09-24 17:52:04 -0500
Seen: 987 times
Last updated: Sep 26 '20
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I would not use ROS as underlying communication protocol with the Arduinos. Instead create your own communication protocol with I2C and write a node for the rpi which converts between the i2c protocol and ROS messages.
Does no one build projects with more than 4 Arduino Mega's?