Hi,

Thank you for the response.

Please see line #48 - “ while (lightning0.begin() != 0)” and the last line -compilation error.

```cpp
/*!
* @file DFRobot_AS3935_lightning_sensor_detailed.ino
* @brief SEN0290 Lightning Sensor
* @n This sensor can detect lightning and display the distance and intensity of the lightning within 40 km
* @n It can be set as indoor or outdoor mode.
* @n The module has three I2C, these addresses are:
* @n  AS3935_ADD1  0x01   A0 = 1  A1 = 0
* @n  AS3935_ADD2  0x02   A0 = 0  A1 = 1
* @n  AS3935_ADD3  0x03   A0 = 1  A1 = 1
* @copyright   Copyright (c) 2010 DFRobot Co.Ltd (https://www.dfrobot.com)
* @license     The MIT License (MIT)
* @author [TangJie](jie.tang@dfrobot.com)
* @version  V1.0.2
* @date  2019-09-28
* @url https://github.com/DFRobor/DFRobot_AS3935
*/

#include "DFRobot_AS3935_I2C.h"

volatile int8_t AS3935IsrTrig = 0;

#if defined(ESP32) || defined(ESP8266)
#define IRQ_PIN       0 
#else
#define IRQ_PIN       2
#endif

// Antenna tuning capcitance (must be integer multiple of 8, 8 - 120 pf)
#define AS3935_CAPACITANCE   96

// I2C address
#define AS3935_I2C_ADDR       AS3935_ADD3

void AS3935_ISR();

DFRobot_AS3935_I2C  lightning0((uint8_t)IRQ_PIN);

void setup()
{

 Serial.begin(115200);
 Serial.println("DFRobot AS3935 lightning sensor begin!");

 lightning0.setI2CAddress(AS3935_ADD3);

 while (lightning0.begin() != 0){
   Serial.print(".");
 }
 lightning0.defInit();

 // Configure sensor
 lightning0.powerUp();
 
 //set indoors or outdoors models
 lightning0.setIndoors();
 //lightning0.setOutdoors();

 //disturber detection
 lightning0.disturberEn();
 //lightning0.disturberDis();

 lightning0.setIRQOutputSource(0);
 
 #if defined(ESP32) || defined(ESP8266)
 attachInterrupt(digitalPinToInterrupt(IRQ_PIN),AS3935_ISR,RISING);
 #else
 attachInterrupt(/*Interrupt No*/0,AS3935_ISR,RISING);
 #endif
 delay(500);
 //set capacitance
 lightning0.setTuningCaps(AS3935_CAPACITANCE);
 Serial.println("AS3935 manual cal complete");
 
// Enable interrupt (connect IRQ pin IRQ_PIN: 2, default)
//  Connect the IRQ and GND pin to the oscilloscope.
//  uncomment the following sentences to fine tune the antenna for better performance.
//  This will dispaly the antenna's resonance frequency/16 on IRQ pin (The resonance frequency will be divided by 16 on this pin)
//  Tuning AS3935_CAPACITANCE to make the frequency within 500/16 kHz ± 3.5%
//  lightning0.setLcoFdiv(0);
//  lightning0.setIRQOutputSource(3);

// Set the noise level,more than 7 will use the default value:2
 lightning0.setNoiseFloorLvl(2);
 //uint8_t noiseLv = lightning0.getNoiseFloorLvl();

//used to modify WDTH,alues should only be between 0x00 and 0x0F (0 and 7)
 lightning0.setWatchdogThreshold(2);
 //uint8_t wtdgThreshold = lightning0.getWatchdogThreshold();

 //used to modify SREJ (spike rejection),values should only be between 0x00 and 0x0F (0 and 7)
 lightning0.setSpikeRejection(2);
 //uint8_t spikeRejection = lightning0.getSpikeRejection();
}

void loop()
{
 // It does nothing until an interrupt is detected on the IRQ pin.
 while (AS3935IsrTrig == 0) {delay(1);}
 delay(5);
 
 // Reset interrupt flag
 AS3935IsrTrig = 0;
 
 // Get interrupt source
 uint8_t intSrc = lightning0.getInterruptSrc();
 if (intSrc == 1){
   // Get rid of non-distance data
   uint8_t lightningDistKm = lightning0.getLightningDistKm();
   Serial.println("Lightning occurs!");
   Serial.print("Distance: ");
   Serial.print(lightningDistKm);
   Serial.println(" km");

   // Get lightning energy intensity
   uint32_t lightningEnergyVal = lightning0.getStrikeEnergyRaw();
   Serial.print("Intensity: ");
   Serial.print(lightningEnergyVal);
   Serial.println("");
 }else if (intSrc == 2){
   Serial.println("Disturber discovered!");
 }else if (intSrc == 3){
   Serial.println("Noise level too high!");
 }
 //View register data
 //lightning0.printAllRegs();
}

//IRQ handler for AS3935 interrupts
#if defined(ESP32) || defined(ESP8266)
void IRAM_ATTR AS3935_ISR()
#else
void AS3935_ISR()
#endif
{
 AS3935IsrTrig = 1;
}

```
Compilation error: 'class DFRobot_AS3935_I2C' has no member named 'begin'