Pin/Screw Terminal Description
Last updated
Last updated
| Description | |
|---|---|
+
This screw terminal position is connected to the positive leg of the supply.
-
This screw terminal position is connected to the ground leg of the supply.
5V
This is a 5V output from the voltage regulator.
3V3
This is the output of the 3.3V voltage regulator.
GND
Board ground pin.
A0-A7
Analog input pins.
D2-D13
Digital I/O pins.
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.
RLY Extension
JST XH male connector. Can be used for more relay control pins or digital I/O.