Infrared Photodiode

// Note: This program requires IRremote library
// Installation: Tools → Manage Libraries → Search "IRremote" → Install

#include <IRremote.h>  // Import infrared receiver library

// Pin number: change this to match your wiring
#define IR_RX_PIN 2  // Arduino digital pin connected to SIGNAL (e.g. D2)

// Create infrared receiver object
IRrecv irrecv(IR_RX_PIN);
decode_results results;  // Store decoding results

void setup() {
  // Start serial for debugging (9600 baud)
  Serial.begin(9600);
  
  // Start infrared reception
  irrecv.enableIRIn();
  
  Serial.println("Infrared receiver program started");
  Serial.println("Waiting to receive infrared signal...");
}

void loop() {
  // Check if infrared signal received
  if (irrecv.decode(&results)) {
    // Signal received, print decoding results
    Serial.print("Infrared signal received, decoded value: 0x");
    Serial.println(results.value, HEX);  // Display in hexadecimal
    
    // Identify common infrared remote codes
    switch(results.value) {
      case 0xFF00FF:  // Example: a button on a remote
        Serial.println("Button 1 pressed");
        break;
      case 0xFF807F:  // Example: another button on a remote
        Serial.println("Button 2 pressed");
        break;
      default:
        Serial.println("Unknown button");
        break;
    }
    
    // Continue receiving next signal
    irrecv.resume();
  }
  
  delay(100);  // Brief delay
}

# Note: This program requires micropython-ir library
# Installation: Copy ir.py file to Pico

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

# Pin number: change this to match your wiring
IR_RX_PIN = 0  # GPIO connected to SIGNAL (e.g. GPIO 0)

# Create pin object
ir_rx = Pin(IR_RX_PIN, Pin.IN)  # Set infrared receiver pin as input mode

print("Infrared receiver program started")
print("Waiting to receive infrared signal...")

# Variables
last_state = 1  # Previous pin state (default HIGH)

# Main loop: runs forever
while True:
    # Read pin state
    current_state = ir_rx.value()
    
    # Detect signal change (HIGH to LOW indicates signal received)
    if current_state == 0 and last_state == 1:
        print("Infrared signal detected")
        # Note: Complete decoding requires micropython-ir library
        # This is just simple signal change detection
    
    # Update previous state
    last_state = current_state
    
    time.sleep(0.01)  # Brief delay