5.8. Expansion headers

The 3pi+ 32U4 control board has several expansion headers (primarily in two areas toward the front of the board) that break out many of the general-purpose I/O lines from the ATmega32U4 microcontroller. Various power inputs, outputs, and control pins are also accessible elsewhere on the board. The following diagrams identify the locations of these pins and the hardware associated with them (OLED version pictured below). These diagrams are also available as printable PDFs:

• 3pi+ 32U4 OLED Control Board pinout and power distribution diagrams (1MB pdf)
• 3pi+ 32U4 Control Board pinout and power distribution diagrams (1MB pdf) (original LCD version)

For more information about the ATmega32U4 microcontroller and its peripherals, see Atmel’s ATmega32U4 documentation.

3pi+ 32U4 OLED Control Board pinout and peripherals.

3pi+ 32U4 OLED Control Board power distribution and control.