SPI-communication

The C-code of a master and slave that communicate over SPI.
The code was written in Atmel Studio and is supposed to demonstrate the functionality of the SPI communication between two Arduino UNO/NANO.

Master

• reads the state of a button
• Send the button state over SPI to the slave
• controls the SPI communication

Slave

• controls an LED depending on the button state of the master
• Turns on the LED in case button is pressed
• Turns off the LED in case button is not pressed

Schematic: