/*********
  Based on Rui Santos  Complete project details at https://randomnerdtutorials.com  
  https://randomnerdtutorials.com/esp32-i2c-scanner-arduino/
  ESP32 default I2C pins are: GPIO 22 (SCL) - GPIO 21 (SDA)

  https://wolles-elektronikkiste.de/i2c-scanner - Testet mit unterschiedlichen Datenraten
  Der I2C Bus besteht aus zwei Leitungen, meist als SDA/SCL bezeichnet. SDA überträgt Daten, SCL gibt Takt vor und bestimmt so die Datenrate.
  Datenraten: Standard Mode, Takt: 100 kHz - Fast: 400 kHz - Fast Plus: 1 MHz - High Speed: 3.4 MHz - Ultra Fast: 5 MHz (nur unidirektional) 


  !!! Restart CPU in order to see the console

*********/

#include <arduino.h> 
#include <Wire.h>

//int I2C_Address_Find();
//bool I2C_Address_Exist(int I2C_Adress);

I2C_Devices MyLCD;

int I2C_Adress_LCD;
bool Flag_I2C_Adress_LCD;


 
void setup() {
    Serial.begin(115200);
    delay(500);                                                     // auf seriellen Monitor warten
    Serial.println("\n +++++++++++  MAIN  ++++++++++++");
    //I2C_Adress_LCD = MyLCD.I2C_Address_Find();
    //Flag_I2C_Adress_LCD = MyLCD.I2C_Address_Exist(I2C_Adress_LCD);

}
 
void loop() {      
}

/*
bool I2C_Address_Exist(int I2C_Adress) {
    Wire.begin();
    bool Flag_I2C_Adress;
    byte error, address;
    int nDevices;
    nDevices = 0;
    for(address = 1; address < 127; address++ ) {
        Wire.beginTransmission(address);
        error = Wire.endTransmission();
        if (error == 0) {
            Flag_I2C_Adress = true;
            nDevices++;
        }
        else if (error==4) {    Flag_I2C_Adress = false; }    
    }
    if (nDevices == 0) { Flag_I2C_Adress = false;  }
    else {Serial.println("Flag_I2C_Adress = " + String( Flag_I2C_Adress)); }
  return Flag_I2C_Adress;
}

int I2C_Address_Find() {             // Finde I2C-Adresse, gib sie zurück, Rückgabewert 0xFFFF = unbek. Error, 0xAAAA = keine gefunden  
    Wire.begin();
    int IC2_Address;
    byte error, address;
    int nDevices;
        nDevices = 0;
    for(address = 1; address < 127; address++ ) {
        Wire.beginTransmission(address);
        error = Wire.endTransmission();
        if (error == 0) {
            IC2_Address = address;
        nDevices++;
        }
        else if (error==4) { IC2_Address = 0xFFFF; }    
    }
    if (nDevices == 0) { IC2_Address = 0xAAAA; }
    else { Serial.println("IC2_Address = " + String(IC2_Address)); }
  return IC2_Address;
}

*/