'''

Voltaat Learn (http://learn.voltaat.com)

Link to the full tutorial:

Tutorial: How to use the keyboard with the Raspberry Pi Pico.

This code controls a servo motor by pressing keyboard buttons.

Note: You can use this sketch with any Raspberry Pi Pico.

'''

from machine import Pin

import time

from servo import Servo   # Import Servo library

# Define keypad rows and columns

rows = [Pin(26, Pin.OUT), Pin(22, Pin.OUT), Pin(21, Pin.OUT), Pin(20, Pin.OUT)]

cols = [Pin(19, Pin.IN, Pin.PULL_DOWN), Pin(18, Pin.IN, Pin.PULL_DOWN),

       Pin(17, Pin.IN, Pin.PULL_DOWN), Pin(16, Pin.IN, Pin.PULL_DOWN)]

# Key map (according to the 4x4 keypad layout)

keys = [['1', '2', '3', 'A'],

       ['4', '5', '6', 'B'],

       ['7', '8', '9', 'C'],

       ['*', '0', '#', 'D']]

# Initialize servo on GP15

my_servo = Servo(pin_id=15)

def read_keypad():

   for i, row in enumerate(rows):

       row.value(1)  # Activate current row

       for j, col in enumerate(cols):

           if col.value() == 1:   # If a key is pressed

               row.value(0)

               # wait until release (debounce)

               while col.value() == 1:

                   time.sleep(0.01)

               return keys[i][j]

       row.value(0)

   return None

# Main program

print("Press 1, 2, 3, or 4 to move servo ...")

while True:

   key = read_keypad()

   if key:

       print("Key pressed:", key)

       if key == '1':

           my_servo.write(0)     # Move to 0 degrees

       elif key == '2':

           my_servo.write(45)    # Move to 45 degrees

       elif key == '3':

           my_servo.write(90)    # Move to 90 degrees

       elif key == '4':

           my_servo.write(180)   # Move to 135 degrees

       time.sleep(0.2)  # Small delay to prevent bouncing

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