GPIO Header Pins
The U300 has a header with 24 pins. Use the below image and chart to determine the purpose of each pin on the header.
PIN # (NAME) Purpose
1 (NC) <reserved / not used>
2 (RST) Reset signal, refer to GND
3 (NC) <reserved / not used>
4 (NC) <reserved / not used>
5 (I1) Input pin 1, refer to IO_GND
6 (I2) Input pin 3, refer to IO_GND
7 (O1) Output pin 1, refer to IO_GND
8 (O2) Output pin 3, refer to IO_GND
9 (IO_GND) Input/Output pin reference Ground
10 (GND) Ground
11 (GND) Ground
12 (5V) 5V/2A referenced to GND power supply
13 (NC) <reserved / not used>
14 (GND) Ground
15 (NC) <reserved / not used>
16 (NC) <reserved / not used>
17 (I2) Input pin 2, refer to IO_GND
18 (I4) Input pin 24 refer to IO_GND
19 (O2) Output pin 2, refer to IO_GND
20 (O4) Output pin 4, refer to IO_GND
21 (D0) Wigan data port 0
22 (D1) Wigan data port 1
23 (TX) 3.3v serial port transmit data line
24 (RX) 3.3v serial port receive data line
Input Wiring Diagram
Sample input wiring diagram. Replace switches with appropriate components or signals. Examples could be push button switches, light sensors, etc...
Output Wiring Diagram
Sample output wiring diagram. Replace load/relay components as needed. Examples could be lights, buzzers, etc...