// Master
#include <Wire.h>

#define RECEIVER_ADDRESS 1 // Receiver will be the XIAO RP2040

const int buttonPin = D0;
int buttonState = 0;

void setup() {
  Wire.begin();
  pinMode(buttonPin, INPUT_PULLUP);
  Serial.begin(9600);
  Serial.println("Master ready");
}

void loop() {
  buttonState = digitalRead(buttonPin);

  if (buttonState == HIGH) {
    Serial.println("Button Pressed");
    sendMessage(RECEIVER_ADDRESS, 1); // Send a signal to the receiver
    delay(1000);
  } else {
    Serial.println("Button Not Pressed");
  }
  delay(100);
}

void sendMessage(int address, byte value) {
  Wire.beginTransmission(address);
  Wire.write(value); // Send the value to the receiver
  Wire.endTransmission();
  Serial.println("Message sent to receiver");
}