connecting RPI to arduino using i2c

Hi all, ive been researching on how to connect an arduino nano to a Rpi and the tutorials Ive found only explain very basic stuff.

Does anyone know where I can find more advanced stuff to do a decent interface between the two.

0 vish over 11 years ago

Hi,
You can refer this link to get an overview : http://blog.retep.org/2014/02/15/connecting-an-arduino-to-a-raspberry-pi-using-i2c/
But as rPi runs on 3v3 and arduino on 5V, I don't recommend you connecting them directly, although in the above article he demonstrates it.
You can use a level shifter for safety. Refer here http://www.nxp.com/documents/application_note/AN10441.pdf

I'm also facing a similar level shift problem and the discussion is going on in this thread : I2C communication between 3.3V uC and 5V uC May be you will find it interesting.
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0 Robert Peter Oakes over 11 years ago in reply to vish

Saying Arduino is 5 V is like saying all cars use reg gas. some dont and with he Arduino you need to look at the various models, some are actually fully 3V3
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0 vish over 11 years ago in reply to Robert Peter Oakes

Oops!!Sorry. My mistake. I generally thought of UNO( or other 5V version ) as it is more popular.
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0 tabarus12 over 11 years ago in reply to vish

Thanks for the info Ill look in to it, the board that I want to connect is the arduino nano.
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0 Robert Peter Oakes over 11 years ago

This is an Arduino that runs on 3V3 Arduino - ArduinoBoardFio

it runs at 8Mhz which is the max for that voltage but may still be more than fast enough depending on your intended use.
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0 mconners over 11 years ago in reply to Robert Peter Oakes

http://arduino.cc/en/Main/ArduinoBoardProMini

These also run at 3.3v , like Peter says though, they run a bit slower but adequate for many applications.

Mike
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0 tabarus12 over 11 years ago in reply to Robert Peter Oakes

Yea thats fast enough for my application, Im planing on using it as an all in one integrated automated home management system.

Basically, depending on the temperature, humidity, wind and sun light, to determine when to open and close windows, shades, to turn external lights on or of and water the lawn.

And using the serial port to connect to an RPI to serve as detection center for the RPI to run as burglar alarm triggering sirens and sending a text to the cellphones of all the registered house occupants when a burglary or trespassing is occurring, its going to be cool.
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