1. Arduino (any Arduino will do). 2. Keypad (it can be 4x4 or 4x3. I have used a 4x4 keypad). 3. Processing Software. 4. Keypad library Here are the links if you don ...

surveyurl: https://www.research.net/r/Download_Arduino_and_install_Arduino_driver ![](https://github.com/SeeedDocument/Download_Arduino_and_install_Arduino_driver/raw ...