This is battery level display module based on battery style digital tube LED.
The 5-segment LED inside is red light and the frame is green light.
There is driver chip TM1651 onboard, so the control interface is simple, just two signal lines and VCC / GND.
It can be used to display the battery power.
1. The module and its libraries are compatible with Ar duino UNO, Leonardo, DUE
2. 8 adjustable gray;
3.Power Supply should be 3.3~5.5VDC;
4. Logic level of the interface can be 3.3V / 5V;
5. 4 screw mounting holes whose diameter is 2.2mm;