Creating Multi-Purpose I2C Devices with Arduino for use with a Raspberry Pi

RE: Creating Multi-Purpose I2C Devices with Arduino for use with a Raspberry Pi

robogary — Sun, 08 Nov 2020 15:54:56 GMT

Frank - Whats your insights on using a I2C IO expander module , such as a https://learn.adafruit.com/gpio-expander-bonnet or https://www.sparkfun.com/products/13601

an Arduino Nano as an I2C slave ?

The Nano seems to be a cheaper solution and adds flexibility to filter, DAC, distributed logic, etc,

RE: Creating Multi-Purpose I2C Devices with Arduino for use with a Raspberry Pi

robogary — Sun, 08 Nov 2020 15:10:07 GMT

Hi Frank - have you invested any more time on this project ?

RE: Creating Multi-Purpose I2C Devices with Arduino for use with a Raspberry Pi

three-phase — Thu, 19 Dec 2019 20:30:09 GMT

Very interesting read Frank, thanks for posting.

Kind regards

RE: Creating Multi-Purpose I2C Devices with Arduino for use with a Raspberry Pi

genebren — Thu, 19 Dec 2019 16:36:31 GMT

Hi Frank,

Great write-up on using I2C between a Raspberry Pi and an Arduino. I find the I2C bus to be a very good solution for inter-processor communications, having used it for those purposes on a wide variety of projects. I find that it is very useful to bridge between a main processor and a variety of sub processors or even hardware (having used it to communicate to hardware devices, CPLD/FPGAs or other processors).

Well done!

Gene

RE: Creating Multi-Purpose I2C Devices with Arduino for use with a Raspberry Pi

dubbie — Thu, 19 Dec 2019 11:52:12 GMT

This looks great. I'd quite like to build a multiprocessor (as in several smaller microcontrollers such as Arduino) for a mobile robot for some time with the idea of using a micro for each function (motor, rangefinders and so on) with a communication link between all the units, in order to be able to work on the individual functional units without having to worry about the rest of the system. I was vaguely thinking about RS232 TTL serial but maybe I2C or SPI might be better. Your blog will be helpful in this aspiration, although I'm not sure how long it might take to convert an aspiration into some type of reality. I seem to always keep getting diverted by interests of the moment.

Dubbie

RE: Creating Multi-Purpose I2C Devices with Arduino for use with a Raspberry Pi

neilk — Thu, 19 Dec 2019 11:50:02 GMT

Nice posting Frank. I'm not a Raspberry user, but I have an interest in ESP8266 to good old Arduino communication. I hadn't thought of using I2C. It could be very useful to me.

Neil

RE: Creating Multi-Purpose I2C Devices with Arduino for use with a Raspberry Pi

shabaz — Thu, 19 Dec 2019 09:36:33 GMT

Hi Frank,

This is an excellent post for reference, I've not used Python for I2C on a Pi before.

Incidentally, whenever I see I2C (or SPI in fact), I always get curious to see what color wires people use : )

I've semi-standardized on yellow for clock signals, and green for data, no idea why : ) but it was a great coincidence to see that's the same color-scheme as on your 'scope traces for I2C!