Silkscreen

Label

Function

PWM

0-3

PWM Signal Output P0~3

Analog

0-3

Analog Signal Input P0~3

IIC

C

IIC Clock line

D

IIC Data Line

UART

T

UART Transmit

R

UART Receive

SPI

MISO

SPI Data Output Line

SS

SPI Enable Pin

SCLK

SPI Clock Line

MOSI

SPI Data Input Line

PWM

The PWM signal of this expansion board is generated by the on-board STM32.

PWM0~PWM3 are output via multiple channels of one timer with same frequency. The

duty ratio can be set by users. PWM4 adopts another timers to output PWM. The PWM

can be powered by Raspberry Pi(5V) or external power(6-12V).