I2C scanner

Use it for scanning i2c bus for devices and sensors

Simple I2C scanner

A simple I2C scanner for an Arduino

Just scanning and showwing adresses.

Some devices are known like BMP280

#include <Wire.h>
#include <I2Cdev.h>

/*
   scanner for devices on i2c bus
   It can be used to detect sensors on gy-91 IMU
   and i2c devices in general

   There i
*/



//JDN testet dor uno,mega, esp32 nodemcu
void setup()
{
  Wire.begin();

  Serial.begin(115200);
  while (!Serial);             // Leonardo: wait for serial monitor
  Serial.println("\nI2C Scanner");
}

void testSlave(byte address)
{
  byte resp[10];


  switch (address) {
    case 0x68:  // mpu6050
    case 0x69:
      Wire.beginTransmission(address);
      Wire.write(byte(0x75));  // get id register from register addr 0x75
      Wire.endTransmission();
      Wire.requestFrom(address, 1);
      resp[0] = Wire.read();
      Serial.print("id: 0x"); Serial.print(resp[0], HEX); Serial.print("\tIMU: mpu6050: 0x68/0x72?(clone?), MPU6000: 0X70, mpu9250: 0x71)");
      break;
    case 0x76:  // bmp280
    case 0x77:  // bmp
      Wire.beginTransmission(address);
      Wire.write(byte(0xd0));  // get id register on addr 0xd0
      Wire.endTransmission();
      Wire.requestFrom(address, 1);
      resp[0] = Wire.read();
      Serial.print("id: 0x"); Serial.print(resp[0], HEX); Serial.print("\tbosch pressure sensor bmp085: 0x55, bmp180: 0x55, bmp285: 0x58)");
      break;
    case 0x1e:  // hmc5883L /hmc5983
      Wire.beginTransmission(address);
      Wire.write(byte(0x0a));  // get id register from addr 0x0a
      Wire.endTransmission();
      Wire.requestFrom(address, 3);
      resp[0] = Wire.read();
      resp[1] = Wire.read();
      resp[2] = Wire.read();
      Serial.print("id: 0x"); Serial.print(resp[0], HEX); Serial.print(" ");
      Serial.print("0x"); Serial.print(resp[1], HEX); Serial.print(" ");
      Serial.print("0x"); Serial.print(resp[2], HEX); Serial.print(" ");
      Serial.print(" HMC: 5983 0x48 0x34 33, HMC5883L 0x48 0x34 0x33  ! same ...");
      break;
    case 0x0d: // qmc5883l
      Wire.beginTransmission(address);
      Wire.write(byte(0x0d));  // get id register from addr 0x0d
      Wire.endTransmission();
      Wire.requestFrom(address, 1);
      resp[0] = Wire.read();
      Serial.print("id: 0x"); Serial.print(resp[0], HEX); Serial.print(" ");
      Serial.print("\tQMC5883L 0xff");
      break;

    default :;
  }

}

void scann(int all)
{
  byte error, address;
  int nDevices;

  Serial.println("\n\n\n\nScanning...");

  nDevices = 0;
  for (address = 1; address < 127; address++ )
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C device: 0x");
      if (address < 16)
        Serial.print("0");
      Serial.print(address, HEX);
      Serial.print("  (");
      Serial.print(address);
      Serial.print(") ");
      testSlave(address);
      Serial.println("");

      nDevices++;
    }
    else if (all == 1) {
      Serial.print("0X");
      if (address < 16)
        Serial.print("0");
      Serial.print(address, HEX);

      switch (error) {
        case 1: Serial.println(" err 1: data to long to fit in tx buffer");
          break;
        case 2: Serial.println(" err 2: received NACK on TX of address - NO DEVICE ?!");
          break;
        case 3: Serial.println(" err 3: received NACK on TX of data");
          break;
        case 4: Serial.println(" err 4: other err");
          break;
        case 5: Serial.println(" err 4: timeout");
          break;
      }
    }
  }

  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else {
    Serial.print("found: "); Serial.print(nDevices); Serial.println(" devices");
  }
}

void loop()
{
  Serial.println("show all i2c device addresses");
  scann(1);
  delay(1000);  // wait 1 sec
  Serial.println("show only found found devices");
  scann(0);
  delay(5000);
}




/*

   Wire.endtransmission()  returns ...

  0: success.
  1: data too long to fit in transmit buffer.
  2: received NACK on transmit of address.
  3: received NACK on transmit of data.
  4: other error.
  5: timeout

  XXXXXXXXXXXXXXXXXXXXXXXX
  mpu6500 et al
  https://wolles-elektronikkiste.de/en/mpu9250-9-axis-sensor-module-part-1
  PROBMLEM 9250 IS A 6500 ??
  https://github.com/kriswiner/ESP32/issues/24

  https://www.tindie.com/products/onehorse/all-st-motion-sensor-breakout-board/
*/

click for raw headerfile code

I2C scanner with mpu6050 bypass

Some IMU boards uses the secondary i2c bus behind the mpu 6050 This scanner do activate the gateway so also devcies behind the mpu6050 can be seen

You need to have mpu6050 installed

(click for mpu6050 i2c scanner code)

#include <Wire.h>
#include <MPU6050.h>

/*
   scanner for devices on i2c bus

   and i2c devices in general


*/

MPU6050 mpu;

//JDN testet dor uno,mega, esp32 nodemcu
void setup()
{
  Wire.begin();

  Serial.begin(115200);
  while (!Serial);             // Leonardo: wait for serial monitor
  mpu.initialize();
  mpu.setI2CBypassEnabled(true);
  delay(500);
  Serial.println("\nI2C Scanner MPU6050");
}

void testSlave(byte address)
{
  byte resp[10];


  switch (address) {
    case 0x68:  // mpu6050
    case 0x69:
      Wire.beginTransmission(address);
      Wire.write(byte(0x75));  // get id register from register addr 0x75
      Wire.endTransmission();
      Wire.requestFrom(address, 1);
      resp[0] = Wire.read();
      Serial.print("id: 0x"); Serial.print(resp[0], HEX); Serial.print("\tIMU: mpu6050: 0x68/0x72?(clone?), MPU6000: 0X70, mpu9250: 0x71)");
      break;
    case 0x76:  // bmp280
    case 0x77:  // bmp
      Wire.beginTransmission(address);
      Wire.write(byte(0xd0));  // get id register on addr 0xd0
      Wire.endTransmission();
      Wire.requestFrom(address, 1);
      resp[0] = Wire.read();
      Serial.print("id: 0x"); Serial.print(resp[0], HEX); Serial.print("\tbosch pressure sensor bmp085: 0x55, bmp180: 0x55, bmp280: 0x58)");
      break;
    case 0x1e:  // hmc5883L /hmc5983
      Wire.beginTransmission(address);
      Wire.write(byte(0x0a));  // get id register from addr 0x0a
      Wire.endTransmission();
      Wire.requestFrom(address, 3);
      resp[0] = Wire.read();
      resp[1] = Wire.read();
      resp[2] = Wire.read();
      Serial.print("id: 0x"); Serial.print(resp[0], HEX); Serial.print(" ");
      Serial.print("0x"); Serial.print(resp[1], HEX); Serial.print(" ");
      Serial.print("0x"); Serial.print(resp[2], HEX); Serial.print(" ");
      Serial.print(" HMC: 5983 0x48 0x34 33, HMC5883L 0x48 0x34 0x33  ! same ...");
      break;
    case 0x0d: // qmc5883l
      Wire.beginTransmission(address);
      Wire.write(byte(0x0d));  // get id register from addr 0x0d
      Wire.endTransmission();
      Wire.requestFrom(address, 1);
      resp[0] = Wire.read();
      Serial.print("id: 0x"); Serial.print(resp[0], HEX); Serial.print(" ");
      Serial.print("\tQMC5883L 0xff");
      break;

    default :;
  }

}

void scann(int all)
{
  byte error, address;
  int nDevices;

  Serial.println("\n\n\n\nScanning...");

  nDevices = 0;
  for (address = 1; address < 127; address++ )
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C device: 0x");
      if (address < 16)
        Serial.print("0");
      Serial.print(address, HEX);
      Serial.print("  (");
      Serial.print(address);
      Serial.print(") ");
      testSlave(address);
      Serial.println("");

      nDevices++;
    }
    else if (all == 1) {
      Serial.print("0X");
      if (address < 16)
        Serial.print("0");
      Serial.print(address, HEX);

      switch (error) {
        case 1: Serial.println(" err 1: data to long to fit in tx buffer");
          break;
        case 2: Serial.println(" err 2: received NACK on TX of address - NO DEVICE ?!");
          break;
        case 3: Serial.println(" err 3: received NACK on TX of data");
          break;
        case 4: Serial.println(" err 4: other err");
          break;
        case 5: Serial.println(" err 4: timeout");
          break;
      }
    }
  }

  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else {
    Serial.print("found: "); Serial.print(nDevices); Serial.println(" devices");
  }
}

void loop()
{
  Serial.println("show all i2c device addresses");
  scann(1);
  delay(1000);  // wait 1 sec
  Serial.println("show only found found devices");
  Serial.println("\nI2C Scanner MPU6050");
  scann(0);
  delay(5000);
}




/*

   Wire.endtransmission()  returns ...

  0: success.
  1: data too long to fit in transmit buffer.
  2: received NACK on transmit of address.
  3: received NACK on transmit of data.
  4: other error.
  5: timeout

  XXXXXXXXXXXXXXXXXXXXXXXX
  mpu6500 et al
  https://wolles-elektronikkiste.de/en/mpu9250-9-axis-sensor-module-part-1
  PROBMLEM 9250 IS A 6500 ??
  https://github.com/kriswiner/ESP32/issues/24

  https://www.tindie.com/products/onehorse/all-st-motion-sensor-breakout-board/
*/

click for raw headerfile code

Jens