می توانید از لینک های آموزشی زیر استفاده نمایید:
Raspberry Pi with Arduino, Serial connection stops working - Arduino Stack Exchange

https://www.pololu.com/product/2595

Level shifters for serial communication to an arduino - Raspberry Pi Stack Exchange

2 cent TTL Level Shifter - connect a 3.3V Pi to 5V TTL serial device or Arduino and more... - All