Mechanical Key and LED

// Pin number: change this to match your wiring
#define BUTTON_PIN 2   // Arduino digital pin connected to BUTTON (e.g. D2)
#define LED_PIN 13     // LED pin (Arduino built-in LED on pin 13, or external LED)

void setup() {
  // Initialize pin modes
  pinMode(BUTTON_PIN, INPUT_PULLUP);  // Set button pin as input mode, enable internal pull-up resistor
  pinMode(LED_PIN, OUTPUT);           // Set LED pin as output mode (to control LED on/off)
  
  // Start serial for debugging (9600 baud)
  Serial.begin(9600);
  
  Serial.println("Mechanical key program started");
  Serial.println("LED on when key pressed, LED off when key released");
}

void loop() {
  // Read button state
  int buttonState = digitalRead(BUTTON_PIN);  // Read button pin level: LOW(0)=pressed, HIGH(1)=released
  
  // Control LED based on button state
  if (buttonState == LOW) {
    // Key pressed: LED on
    digitalWrite(LED_PIN, HIGH);
    Serial.println("Key pressed - LED on");
  } else {
    // Key released: LED off
    digitalWrite(LED_PIN, LOW);
    Serial.println("Key released - LED off");
  }
  
  delay(100);  // Brief delay to avoid reading too fast
}

# Import required modules
from machine import Pin  # GPIO control
import time              # For delay (time.sleep)

# Pin number: change this to match your wiring
BUTTON_PIN = 0   # GPIO connected to BUTTON (e.g. GPIO 0)
LED_PIN = 1      # LED pin (GPIO 1, or external LED, Pico built-in LED is GPIO 25)

# Create pin objects
button = Pin(BUTTON_PIN, Pin.IN, Pin.PULL_UP)   # Set button pin as input mode, enable pull-up resistor
led = Pin(LED_PIN, Pin.OUT)                     # Set LED pin as output mode (to control LED on/off)

print("Mechanical key program started")
print("LED on when key pressed, LED off when key released")

# Main loop: runs forever
while True:
    # Read button state
    buttonState = button.value()  # Read button pin level: 0=pressed (LOW), 1=released (HIGH)
    
    # Control LED based on button state
    if buttonState == 0:
        # Key pressed: turn LED on and print message
        led.on()                 # Output HIGH, LED on
        print("Key pressed - LED on")
    else:
        # Key released: turn LED off
        led.off()                # Output LOW, LED off
        print("Key released - LED off")
    
    # Delay 100 milliseconds to avoid reading too fast
    time.sleep_ms(100)