//I2C scanner
// author : Patrick Luyts
// date: 18/11/2023
//*************************************************
// initialisation
#include <Wire.h>
#define Led_Pin_Groen 19
#define Led_Pin_Rood 18
//************************************************
//setup
void setup() {
  Wire.begin();
  Serial.begin(115200);
  Serial.println("\nI2C Scanner");
  pinMode(Led_Pin_Groen, OUTPUT);
  pinMode(Led_Pin_Rood, OUTPUT);
}

void loop() 
{
  byte error, address;
  int nDevices;
  Serial.println("Scanning...");
  nDevices = 0;
  for (address = 1; address < 127; address++ ) 
  {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    if (error == 0) 
    {
      Serial.print("I2C device found at address 0x");
      if (address < 16) 
      {
        Serial.print("0");
        digitalWrite(Led_Pin_Groen, HIGH);
        delay(1000);
        digitalWrite(Led_Pin_Groen, LOW);
        delay(1000);
      }
      Serial.println(address, HEX);
      nDevices++;
    }
    else if (error == 4) 
    {
      Serial.print("Unknow error at address 0x");
      if (address < 16) 
      {
        Serial.print("0");
      }
      Serial.println(address, HEX);
    }
  }
  if (nDevices == 0) 
  {
    Serial.println("No I2C devices found\n");
    digitalWrite(Led_Pin_Rood, HIGH);
    delay(1000);
    digitalWrite(Led_Pin_Rood, LOW);
    delay(1000);
  }

else 
{
  Serial.println("done\n");
}
delay(5000);
}