Matrix keyboard with capacitive sensor
The card has outputs of each key and communication with 2 wires, so it is not necessary to use more than 2 wires to communicate with the microcontroller or arduino
LED indicator on the board
Model: TTP229
Voltage: 2.4V to 5.5V
Response time: 100 mS
Sensitivity control.
Energy saving mode (2.5 uA)