Parameter
Detailed introduction:
On the board IN-A IN-B IN-C IN-D connector is a four-way signal input. OUT interface is output. But interface external button switch signal use. The POWER (or + G) interface supplies the power interface with a DC voltage of 5V.
The input and output interfaces are defined as follows: The input and output interfaces have the same definition but different signal directions. IN-A IN-B IN-C IN-D direction is input, and OUT direction is output!
It should be noted that when one of the signal lines such as D1 is used as the DATA data line, then all input and output interfaces of D1 must be used as DATA; D2-D8 is the same reason.
Connect the +5V G of the power connector to GND. The wrong results in damage to the board is at your own risk!
When the But interface is connected to the button, the two lines of the button should be connected to the But interface. Please do not lead from other places. The two lines that connect the button cannot connect any other place. Otherwise, any problem occurs.
On the board A B C D V 5 single-character interfaces for LED display use!

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