Datasheet

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Connections can be made in many ways:
2.1 Atmega-328 & Pi UART
Pi to RS232 buffers Atmega-328 to RS232 buffers Pi to Atmega-328
Raspberry-Pi
Atmega 328
RS232
buffers
Raspberry-Pi
Atmega 328
RS232
buffers
Raspberry-Pi
Atmega 328
RS232
buffers
Atmega
48
Atmega
48
Atmega
48
2.2 Atmega-48 UART
Atmega-48 to RS232 buffers Atmega-48 to Atmega-328 Atmega-48 to Pi
Raspberry
-Pi
Atmega 328
RS232
buffers
Raspberry-Pi
Atmega 328
RS232
buffers
Raspberry-Pi
Atmega 328
RS232
buffers
Atmega
48
Atmega
48
Atmega
48