Hi. How to connect Raspberry Pi3 with Arduino MEGA 2560 to get more GPIO?

[image] Raspberry PI + Arduino - Serial Binding Items & Sitemaps It is part of the task which I need to accomplish confused Or you can add a ethernet module to the mega2560 and use MQTT protocol for data exchange

Hi, I have used two MEGA 2560’s connected to my PI through serial, after which I decided to use I2C with MCP23017, which I did not regret. Code was simpler with I2C, everything worked well from the start.

[image] Zoltan_Rokk: I have used two MEGA 2560’s connected to my PI through serial, after which I decided to use I2C with MCP23017, which I did not regret. Code was simpler with I2C, everything worked well from the start. you can provide a link to the I2C from MCP23017 that you use?

I2C is the protocol on which the MCP23017 communicates with RPi. I’m using a custom built PCB for the controller itself, but you can use for starters maybe a shield, for ex.: [image] IO Pi Plus - Raspberry Pi 32 Channel GPIO Port Expander Add 32 digital GPIO pins to your Raspberry Pi wi…