Discover how to use a 3x4 keypad with Arduino UNO R4. This includes connecting the 3x4 keypad, coding, verifying the keypad password, and programming the Arduino UNO R4. The guide includes detailed instructions, code samples, wiring diagrams, and video tutorials that explain each code line by line. This will help you begin easily. For more Arduino UNO R4 tutorials, visit Newbiely.com.