Pin/Screw Terminal Description
+
This screw terminal position is connected to the positive leg of the 12V supply.
-
This screw terminal position is connected to the ground leg of the 12V supply.
5V
This screw terminal is a 5V output from the buck converter
3V3
This pin is the output of the 3.3V voltage regulator.
GND
Board ground pin and screw terminal.
A0-A5
Analog input pins that can also act as standard digital GPIO and are PWM capable.
D2-D4
Common GPIO pins that are PWM capable.
MO,MI,SCK
SPI pins. They can also be used as digital GPIOs.
RX
Primarily used as a UART RX pin, can also be used as a digital GPIO.
TX
Primarily used as a UART TX pin, can also be used as a digital GPIO.
SDA
Primarily used as a data pin for I 2C, can also be used as a digital GPIO.
SCL
Primarily used as a clock pin for I 2C, can also be used as a digital GPIO.
NO
Normally Open pin for the relay.
COM
Common pin for the relay.
NC
Normally Closed pin for the relay.
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