It includes a Keypad library and defines variables for the keypad layout and pinouts, as well as functions for controlling the LED lights. An array is used to track which key is holding to determine ...

So we won’t use the last pin of keypad which is for fourth column. You can also use 4X3 keypad instead of 4X4 keypad. Next connect the Led's, servo and buzzer with the Arduino as shown in the below ...

(keypad: columns and rows switching) So now you can see how the button presses can be translated into electrical data for use with a microcontroller. We can now start the real experiment with as ...

The Board Overview Now, if we look at the Arduino Uno R4 WiFi development board, we can see that it comes with many hardware upgrades over its predecessor. Here is a part marking image of the Arduino ...