Use 5V power supply and short press the button to increase the power-on interval. The default is 125ms and the maximum is 2000ms. The code can be changed by yourself.
Press and hold for 1S to get random numbers
Highest count 4096
The capacitor in the upper left corner is not easy to solder and needs to be changed. You can change the PCB by yourself.
All use 1K resistors. 3MM led lights are easily broken. You need to buy more when purchasing.
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