Keypad 1x4 Independent Button
Here's a pretty nifty device! The Keypad 1x4 Independent Button is an Arduino-compatible electronic module that offers four momentary button inputs for your projects. You can connect to it using the five male header pins onboard. Each of the four buttons has one pin, and the remaining connects to the common ground line.
- 1 x 4 Independent Key Button Keypad Keyboard Module