SPI - Arduino uno (Slave) Raspberry pi (Master)

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1

Hi! I want to know how can I connect arduino uno as slave and raspberry pi 3 as Master . How can i send commands from raspberry pi to arduino uno. connection and code . Thank You

2

Master and Slave in which protocol?
I2c, SPI, Modbus, Can?

3

SPI protocol

4

I changed the title of your topic to more informative one

5

One will need to consider the physical connection between a 3V3 RPi and a 5V Uno. One may consider using a 3V3 micro controller or using level shifters. Pick one.

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