This little guy, while simple in nature, acts as a fully functional (and portable) keypad on the go! It comes with two main programs, and it connects easily to your Arduino. It can be used to: 1 ...

Arduino code for testing matrix keypad functionality In the code written in Arduino IDE is demnostrated the work of a matrix keypad consisted of three rows and four columns. The three row pins and ...

Arduino-Safe-Servo-Matrix-Keypad Download the ZIP file and extract it on your computer, then open click on safe_and_servo.ino and your Arduino IDE should pop up, click upload and it should be good.

Yes, they’re marked Analog in, but it doesn’t matter. The keypad switch matrix is connected in four columns and two rows. Each of the four columns gets a pull-down resistor.