The main control of this industrial control board is compatible with Arduino Uno, and it is easy to master the control
principle. By re-distributing the pins and combining them with the relay, the input-output linkage control is well realized. The
1602 display can feedback on the desired port data. The power supply and programming ports use 9-pin VGA ports, which can adapt to a variety of complex production environments and are more stable. Pin condition
0: (Rx) for receiving serial data
1: (TX) for sending serial data
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2, 3: The external interrupt signal can be input, and the interrupt can be triggered when the external low level, level change
or rising and falling edges occur. 3, 5, 6, 9, 10,11: These pins provide 8-bit PWM output, using functions like analogWrite()
10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK): These pins support SPI communication and can be operated using the official
SPI library
I2C: A4 (SDA) and A5 (SCL), you can use the official Wire library to operate

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