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#include "Wire.h" 

#define MPU6050_ADDR              0x68
#define MPU6050_PWR_MGT_1         0x6B 
#define MPU6050_INT_ENABLE        0x38
#define MPU6050_WOM_EN            0x06 
#define MPU6050_WOM_THR           0x1F 

byte interruptPin = 2;

void setup() {
  Serial.begin(9600);
  
  Wire.begin();
  writeRegister(MPU6050_PWR_MGT_1, 0);
  setInterrupt(1); // Set Wake-on-Motion Interrupt Threshold
  
  pinMode(interruptPin, INPUT);
  attachInterrupt(digitalPinToInterrupt(interruptPin), motionInterrupt, RISING);
  
  // Set timer to go back into deep sleep after 10 seconds
  esp_sleep_enable_timer_wakeup(10 * 1000000); // 10 seconds converted to microseconds
  esp_deep_sleep_start();
}

void loop() {
  // This code won't be executed after waking up
}

void setInterrupt(byte threshold){
  writeRegister(MPU6050_WOM_THR, threshold); // Set Wake-on-Motion Threshold
  writeRegister(MPU6050_INT_ENABLE, 1 << MPU6050_WOM_EN); // Enable the interrupt
}

void writeRegister(uint16_t reg, byte value){
  Wire.beginTransmission(MPU6050_ADDR);
  Wire.write(reg);
  Wire.write(value);
  Wire.endTransmission();
}

void motionInterrupt() {
  Serial.println("ESP32 has been woken up!");
  delay(100); // Short delay to ensure the serial print completes
}