4×4 Matrix Keypad – 1Pc
$50.14
$81.73
Microcontroller: ATmega32u4Operating voltage: 5VInput voltage(recommended): 7V – 12V Input voltage(limits): 6V – 20VDigital I / O pins: 20 PWM channels: 7PWM channels: 7 Analog input channels: 12 DC current per I / O pin: 40mA
Arduino