// Master (ESP32)
#include <Wire.h>

#define SLAVE_ADDR 0x10  // I2C address of the slave

void setup() {
  Wire.begin();  // Join I2C bus as master
  Serial.begin(115200);
  delay(1000);
  Serial.println("Master ready");

  // Send a pick command to Slave (e.g. light LED #2)
  sendPickCommand(SLAVE_ADDR, 2);
}

void loop() {
  // Optional: could wait for confirmation or schedule next pick
}

void sendPickCommand(uint8_t addr, uint8_t ledNumber) {
  Wire.beginTransmission(addr);
  Wire.write(ledNumber);  // send LED number to light up
  Wire.endTransmission();
  Serial.printf("Sent pick command to slave 0x%02X: LED #%d\n", addr, ledNumber);
}