If you want to add a keypad to your Arduino project, the options are pretty limited. There’s that red and blue 4×4 membrane we’ve all seen in password-protected door lock projects,… ...

To build this project, all you need is three main components: an Arduino Uno, a 16x2 LCD, and a push button. You can connect everything to a breadboard to keep it simple.

The $87.36 Arduino Plug and Make Kit comes with an Arduino UNO R4 WiFi ... a movement sensor, a time-of-flight distance sensor, a buzzer, a thermometer and humidity sensor, and a set of three buttons.