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Keypad Simulation with Raspberry Pi Pico RP2040

Hello Guys, In this tutorial, we'll learn to simulate a 4x4 keypad with Raspberry Pi Pico in wokwi online simulator using micropython. The best part of this simulator is, you don't have to pay any money to use it. Just a pc or laptop with an active internet connection is required for this.

You can also follow the below video or step-by-step interfacing of keypad with Raspberry Pi Pico.

Video Tutorial:


Source Code:

This code is for reading input from a 4x4 keypad using a microcontroller. The keypad has 4 columns and 4 rows, and the pins for each are specified in the lists "col_list" and "row_list". The code sets the rows as output pins and the columns as input pins with pull-up resistors enabled. It then creates a map between the keypad buttons and characters, and defines a function "Keypad4x4Read()" that takes in the column and row pins as arguments. The function iterates through the rows, setting each one low and reading the values of the columns. If a button press is detected, the corresponding character is returned and the pressed button is managed. 

In the main loop, the function is called and if a button press is detected, the pressed button's character is printed. There is also a sleep function to avoid multiple key press detections.

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