To facilitate the development of your connected objects based on Arduino, ESP32, ESP8266, STM32 or Raspberry Pi micro-controllers, here is a list of the most common I2C (breakout) modules. Ambient sensors (temperature, relative humidity, atmospheric pressure, light intensity, etc.), detection of pollutants (CO, CO2, eTVOC, etc.), AMG8833 thermal camera, LDC2004 or SSD1306 screens and I/O expansion boards digital or analog.

Each manufacturer has provided a method to activate the alternative I2C address. Generally, it will be necessary to make a small solder on the module (breakout) or to apply a voltage (3V3 or 5V for example). On the other hand, it is very rarely possible to modify the address by programming.

Here are two examples that we meet quite often

BME280	BH1750FVI
To assign the i2c address 0x77, you have to solder a jumper between the two right pins and cut the track between the two left pins	To assign the address 0x5C, a voltage greater than 0.7V must be applied to the ADDR pin

To learn more about the I2C bus, you can continue by reading this article

Arduino, ESP32 or ESP8266 I2C scanner

If you can’t find your component’s I2C address or are having communication issues, here is the source code for an Arduino, ESP32, and ESP8266 compatible I2C scanner.

#include <Arduino.h>
#include <Wire.h>

#define DISPLAY_ERROR false 
#define LOOP_DELAY    10000
#define USER_PIN      false

// Personnaliser les broches du bus I2C pour ESP8266 ou ESP32 
// Customize I2C bus pins for ESP8266 or ESP32
const int PIN_SCL = D1;
const int PIN_SDA = D2;

String I2Ctest() {
  byte error, address;
  int nDevices;
  String s;
 
  s="Scanning...\n";
 
  nDevices = 0;
  for(address = 1; address < 127; address++ ) {  
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
 
    if (error == 0) {
      s+="I2C device found at 0x";
      if (address<16)
        s+="0";
        s+=String(address,HEX);
        s+="\n";
 
      nDevices++;
    } else if ( error > 0 ) {
      if ( DISPLAY_ERROR ) {
        s+="Unknow error at 0x";
        if (address<16)
          s+="0";
          s+=String(address,HEX);
          s+="\n";
      }  
    }    
  }
  if (nDevices == 0)
    s+="No I2C devices found\n";
  else
    s+="done\n";
  return s; 
}

void setup() {
  Serial.begin(115200);
  Serial.println("I2C scanner");
  #if USER_PIN
    Wire.begin(PIN_SDA, PIN_SCL);
  #else
    Wire.begin();
  #endif
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println(I2Ctest());
  delay(LOOP_DELAY);
}

Default pins of the I2C bus of the most common development boards

Here is the list of the default pins of the most common development boards.

It is possible to manually specify the I2C pins only for ESP32 and ESP8266.

(*) Do not use the pins marked SDA and SCL on the Arduino Uno.

Before you can use I2C components using the Raspberry Pi’s GPIO, you must first activate the bus. Follow the detailed instructions in this tutorial

I2C environmental sensors

Sensors for measuring temperature, humidity, atmospheric pressure, brightness.

Sensor	Measured	I2C address	Alternative address	Buy
BH1750	Light intensity 0 ~ 65535 lux 16 bit converter Technical documentation	0x23	0x5C If voltage on ADDR> 0.7 VDC	$6.50 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com
Projects and articles on the BH1750FVI New LoLin W600-PICO and WeMos d1 mini compatible shields BH1750 (GY-302), measure the lighting quality of your home (Arduino / ESP8266 / ESP32)
BMP180	Air pressure 300 ~ 1100hPa Technical documentation	0x77		$1.80 BUY NOW Ebay
BMP280	Temperature from -40 ~ +85 ° C Air pressure of 300 ~ 1100 hPa Technical documentation	0x76	0x77	$1.80 BUY NOW Ebay
BME280	Temperature from -40 ~ +85 ° C Humidity 0 ~ 100% Air pressure from 300 ~ 1100 hPa Technical documentation	0x76	0x77	$8.99 2 new from $6.99 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com $23.69 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com
BME680	Temperature of -40 ~ +85 ° C Humidity 0 ~ 100% Air pressure of 300 ~ 1100 hPa Technical documentation	0x76	0x77	$22.95 2 new from $22.95 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com $24.99 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com
Projects and articles produced using a BMP180, BME280 or BME680 sensor How to store data on a micro SD card. Arduino code compatible ESP32, ESP8266 OLED display SSD1306 in MicroPython, example with a I2C digital barometer BME280 (or BMP180) IoT development based on Orange Pi, Arduino (Firmata), Nodejs, Blynk and Johnny-Five Start programming with Node Js and Johnny-Five: IoT and robotics based on Arduino, Raspberry Pi, Orange Pi ESP8266 (Web Client): Sending Data to Jeedom in TCP / IP Wireless (JSON API) – Part 1 Driving the GPIO of the ESP8266 (Web Server) from Domoticz to TCP/IP Wireless – Part 2 ESP Easy: firmware ESP8266 to create connected and home automation objects without programming ESP8266 (Web Client): Sending Data to Domoticz in TCP/IP Wireless (API/JSON) – Part 1 ESP8266 (Web Server – Part 5): how to use Google Charts to display gauges and charts ESP8266 (Web Server – Part 2): Interaction between Arduino code and HTML interface ESP8266 (Web Server – Part 1): Store the web interface in the SPIFFS area (HTML, CSS, JS) Bootstrap: create a beautiful Web Interface for your projects ESP8266 ESP8266. Understand the Arduino code of a web server with HTML interface BMP180 (Arduino): how to create a numerical barometer sensor ESP Easy: How to add OLED SSD1306 display to an IoT ESP8266 project
DHT12	Temperature from -20°C ~ +60°C (±0,5°C) Humidity from 20 to 95% (±5°C)	0xB8		$27.34 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com
MLX90614	No contact temperature from -40 ~ +125°C	0x5A	0x01 to 0x7F	$11.88 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com
MS5611	Temperature from -40°C ~ +85°C Atmospheric Pressure from 10 ~ 1200 mbar	0x76
SHT30	Temperature de -40°C ~ +125°C Technical datasheet	0x44	0x45	Breakout $11.90 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com $38.46 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com More breakout, LoLin Shields
Projects and tutorials New LoLin W600-PICO and WeMos d1 mini compatible shields
SI7021	Température de -10 ~ 85°C Humidité de 0 ~ 80% Technical datasheet	0x40		$12.95 $14.95 4 new from $12.95 as of 19 January 2021 2 h 01 min BUY NOW Amazon.com
TSL2561	Light Intensity from 188 μLux ~ 88000 lux Documentation technique	0x29	0x39 0x49	$9.59 2 new from $9.59 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com
TCS34725	RGB color sensor Technical datasheet	0x29

Current measurement

Sensor	Measured	I2C address	Alternative address	Buy
INA219	Direct current measurement up to 26V@3.2A Technical documentation	0x40	0x41 0x44 0x45	$7.89 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com $10.49 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com $12.49 2 new from $12.49 as of 19 January 2021 2 h 02 min BUY NOW Amazon.com
Projects and articles

Detection of pollutants. C0, CO2

Sensor	Measured	I2C address	Alternative address	Buy
CCS811	eCO2, CO2 equivalent of 400ppm ~ 29206ppm eTVOC, Total Volatile Organic (or eCOV) equivalent up to 32768ppb Bus speed: 100kHz, 400kHz Technical documentation	0x5A	0x5B	$10.25 as of 19 January 2021 2 h 03 min BUY NOW Amazon.com $10.66 as of 19 January 2021 2 h 03 min BUY NOW Amazon.com $22.95 as of 19 January 2021 2 h 03 min BUY NOW Amazon.com
Projects and articles

I2C thermal camera

Sensor	Measured	I2C address	Alternative address	Buy
AMG8833 / AMG8831	Thermal image 8×8 pixels (64 pixels) from -20°C to +80°C	0x69	0x68	$36.50 BUY NOW $43.00 BUY NOW $66.48 as of 17 January 2021 2 h 03 min BUY NOW Amazon.com
Projects and articles Convert Arduino code into ESP Easy Mega plugin for ESP8266 / ESP32

Accelerometer, gyroscope, magnetometer

To remotely control a robotic arm, a drone, a game …

Comparative table of the most common breakouts, MPU6050, MPU9250 and ADXL345.

	MPU6050	ADXL345	MPU9250
Gyroscope (axes)	3	3	3
Gyroscope measurement game			± 250, ± 500, ± 1000, ± 2000 ° / sec
Accelerometer (axes)	3	3	3
Accelerometer measuring range	± 2g / ± 4g / ± 8g / ± 16g	± 2g / ± 4g / ± 8g / ± 16g	± 2g / ± 4g / ± 8g / ± 16g
Magnetometer (axes)			3
Magnetometer measuring capacity			± 4800µT
Total degrees of freedom (DOF)	6	6	9
I2C addresses	0x68 0x69	0x1C	0x68 0x0C
Max speed of the I2C bus	400 kHz	400 kHz	400 kHz
SPI	✓	✓	✓
Supply voltage	2.375V ~ 3.46V	2.0V ~ 3.6V	2.4V ~ 3.6V
Consumption		23 µA 0.1 µA (standby)	3.5mA
Operation	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Technical documentation	Read	Read	Read

OLED and LCD screens on I2C bus

Equipment	Application	I2C address	Alternative address	Buy
LCD2004	4-line LCD display screen Technical documentation	0x27
SSD1306	Black and white OLED screens, 64×64 or 128×68 pixels	0x3C		128×64 pixels $6.99 as of 19 January 2021 2 h 03 min BUY NOW Amazon.com $18.99 $19.99 as of 19 January 2021 2 h 03 min BUY NOW Amazon.com More dimensions
Projects and articles Unpacking Wemos ESP32 LoLin clone with 0.96” SSD1306 monochrome OLED display OLED display SSD1306 in MicroPython, example with a I2C digital barometer BME280 (or BMP180) Portable WiFi Scanner with OLED Display (ESP8266): signal strength, connection test to a server Domoticz: Lua script to create a remote OLED display with ESP Easy Connect an I2C SSD1306 OLED display and an ESP-01 (ESP8266) Jeedom, create an OLED SSD1306 remote display with ESP Easy and HTTP request ESP Easy: How to add OLED SSD1306 display to an IoT ESP8266 project

Additional digital I / O expansion boards, RTC clock

Equipment	Application	I2C address	Alternative address	Buy
ADS1115	4 additional 16-bit A / D inputs Technical documentation	0x48	0x4B
DS1307	Real-time clock with optional battery backup	0x68
MCP23017	16 additional digital inputs / outputs, DIP28 box Bus speed: 100kHz, 400kHz, 1.7MHz Technical documentation	0x20	0x27	$4.99 5 new from $4.95 as of 19 January 2021 2 h 04 min BUY NOW Amazon.com $23.95 as of 19 January 2021 2 h 04 min BUY NOW Amazon.com
PCF8574	8 additional digital inputs / outputs Bus speed: 100kHz, 400kHz, 1MHz Technical documentation	0x38	0x3F	$6.99 as of 19 January 2021 2 h 03 min BUY NOW Amazon.com $7.99 as of 19 January 2021 2 h 03 min BUY NOW Amazon.com
PCA9685	16 12-bit PWM channels Technical documentation	0x40	0x7F

Equipment classification by I2C address

0x10

VEML6075 UV sensor. 0x10 only

VEML7700 Ambient light sensor. 0x10 only

0x11

Si4713 FM transmitter with RDS. 0x11 or 0x63

0x13

VCNL40x0 Proximity sensor. 0x13 only

0x18

MCP9808 Temperature sensor. From 0x18 to 0x1F

LIS3DH 3-axis accelerometer. 0x18 or 0x19

0x19

LSM303 Accelerometer. 0x1E for the magnetometer

0x1C

LSM303 Magnetometer. 0x19 for the accelerometer

MMA845x 3-axis accelerometer. 0x1C or 0x1D. Obsolete

FXOS8700 Accelerometer + magnetometer. 0x1C, 0x1D, 0x1E or 0x1F. Obsolete

MMA7455L Accelerometer. 0x1C or 0x1D

0x1D

LSM9DS0 IMU 9 axes (0x1D or 0x1E for Accel / Mag, 0x6A or 0x6B for Gyro)

ADXL345 3-axis accelerometer. 0x1D or 0x53

0x1E

HMC5883 Magnetometer. 0x1E only

LIS2MDL Magnetometer. 0x1E only.

0x20

FXAS21002 Gyroscope. 0x20 or 0x21

MCP23008 GPIO expansion module. 0x20 or 0x27

MCP23017 GPIO expansion module. 16 additional digital inputs / outputs. 0x20 or 0x27

0x23

BH1750 Light intensity 0 ~ 65535 lux, 16 bit converter. 0x23 or 0x5C

0x26

MSA301 3-axis accelerometer. 0x26 only. Obsolete

0x27

LCD2004 Driver for 4-line LCD display screen. 0x27 only

0x28

BNO055 IMU. 0x28 or 0x29

CAP1188 8-channel capacitive touch sensor. From 0x28 to 0x2D

DS3502 10K digital potentiometer. From 0x28 to 0x2B. Obsolete

PCT2075 Temperature sensor. Several ranges available: 0x28-0x2E, 0x48-0x4F, 0x70-0x77

0x29

TCS34725 Color sensor. 0x29 only

TSL2561 Light sensor. 0x29, 0x39 or 0x49

TSL2591 Light sensor. 0x29 or 0x28

VL53L0x Distance measurement by ToF laser. 0x29, configurable from code

• HC-SR04 (ultrasound) vs Sharp GP2Y0A02YK0F (IR) vs VL53L0X (Laser), which solution to choose for distance measurement with Arduino or Raspberry Pi

VL6180X ToF sensor. 0x29 only

0x33

MLX90640 8×8 pixel infrared thermal camera. 0x33 only

0x38

VEML6070 UV index. 0x38 or 0x39

FT6x06 Capacitive touch sensor. 0x38 only. Obsolete

PCF8574 8 additional digital inputs / outputs. 0x38 or 0x3F

0x39

APDS-9960 IR / Color / Proximity sensor. 0x39 only

0x3C

SSD1305 I2C Monochrome OLED display. 0x3C or 0x3D using a solder jumper on some boards

SSD1306 I2C Monochrome OLED display. 0x3C or 0x3D using a solder jumper on some boards

• Unpacking Wemos ESP32 LoLin clone with 0.96” SSD1306 monochrome OLED display
• OLED display SSD1306 in MicroPython, example with a I2C digital barometer BME280 (or BMP180)
• Portable WiFi Scanner with OLED Display (ESP8266): signal strength, connection test to a server
• Domoticz: Lua script to create a remote OLED display with ESP Easy
• Connect an I2C SSD1306 OLED display and an ESP-01 (ESP8266)
• Jeedom, create an OLED SSD1306 remote display with ESP Easy and HTTP request
• ESP Easy: How to add OLED SSD1306 display to an IoT ESP8266 project

0x40

Si7021 Humidity / temperature sensor. 0x40 only

HTU21D-F Humidity / temperature sensor. 0x40 only. Obsolete

HDC1008 Humidity / temperature sensor. 0x40, 0x41, 0x42 or 0x43. Obsolete

TMP007 IR temperature sensor. From 0x40 to 0x47. Obsolete

TMP006 IR temperature sensor. From 0x40 to 0x47. Obsolete

PCA9685 16-channel PWM expansion board. From 0x40 to 0x7F

INA219 DC current / voltage sensor. From 0x40 to 0x7F

INA260 Precision DC current / power sensor. From 0x40 to 0x7F. Obsolete

0x41

STMPE610 / STMPE811 Resistive touch sensor. 0x41 or 0x44. Obsolete

0x44

SHT30 Humidity / temperature sensor. 0x44 or 0x45

ISL29125 RBG color sensor. 0x44 only

0x48

ADS1115 4-channel 16-bit ADC expansion board. 0x48 0x49 0x4A or 0x4B

PN532 NFC / RFID reader. 0x48 only

0x50

MB85RC FRAM memory module. From 0x50 to 0x57

0x52

Nintendo Nunchuck Controller . 0x52

0x57

MAX3010 Pulse and oximetry sensor

0x58

TPA2016 I2C Audio Amplifier

SGP30 Air Quality Measurement (IAQ)

0x5A

MPR121 12 point capacitive touch sensor. 0x5A, 0x5B, 0x5C or 0x5D

CCS811 VOC sensor. 0x5A or 0x5B

MLX9061x Non-contact IR temperature sensor from -40 ° C to + 125 ° C. 0x5A only

DRV2605 Driver for Haptic motor. 0x5A only. Obsolete

0x5C

AM2315 Humidity and temperature sensor. 0x5C only

AM2320 Humidity and temperature sensor. 0x5C only

LPS25 Digital barometer. 0x5C or 0x5D.

LPS33HW Digital barometer. 0x5C or 0x5D.

LPS35HW Digital barometer. 0x5C or 0x5D.

0x5E

TLV493D 3 axis magnetometer . 0x5E

0x60

MCP4728 12-bit analog to digital converter, 4 inputs. 0x60 only

MPL115A2 Digital barometer. 0x60

MPL3115A2 Digital barometer. 0x60 only

Si5351A Clock generator. 0x60 or 0x61

Si1145 Light / infrared sensor. 0x60 only

MCP4725A0 12 bit DAC. 0x60 or 0x61

TEA5767 Stereo radio receiver. 0x60 only

VCNL4040 Proximity and ambient light sensor. 0x60 only

0x62

MCP4725A1 12-bit DAC. 0x62 or 0x63

0x68

AMG8833 Thermal IR Breakout Camera (0x68 or 0x69)

• Convert Arduino code into ESP Easy Mega plugin for ESP8266 / ESP32

DS1307 RTC clock

DS3231 RTC clock

ICM-20649 Accelerometer + Gyroscope. 0x68 or 0x69

ITG3200 Gyroscope. 0x68 or 0x69

MPU-9250 9-DoF IMU. 0x68 or 0x69

MPU-60X0 Accelerometer + Gyroscope. 0x68 or 0x69

PCF8523 RTC clock. 0x68 only

0x6A

ICM330DHC 6 axis IMU. 0x6A or 0x6B

L3GD20H Gyroscope. 0x6A or 0x6B

LSM6DS33 6 axis IMU. 0x6A or 0x6B

LSM6DSOX 6 axis IMU. 0x6A or 0x6B

0x70

HT16K33 LED Matrix Driver. From 0x70 to 0x77

TCA9548 Extension board with 8 additional digital outputs. From 0x70 to 0x77

0x76

BMP280 Temperature, atmospheric pressure. 0x76 or 0x77

BME280 Temperature, humidity, atmospheric pressure. 0x76 or 0x77

BME680 Temperature, humidity, atmospheric pressure, air quality (IAQ). 0x76 or 0x77

MS5607 / MS5611 Digital barometer. 0x76 or 0x77

0x77

BMA180 Accelerometer. 0x77 only

BMP085 Temperature, barometer. 0x77 only. Obsolete

Updates

10/6/2020 First publication 

• 4 solutions to add I/O (ADS1115, MCP23017, PCF8574, PCA9685). Arduino, ESP8266, ESP32, ESP8266, Raspberry Pi Projects
• I2C addresses of the most common sensors and actuators
• Get started with the I2C bus on Arduino ESP8266 ESP32. Wire.h library
• Unpacking Wemos ESP32 LoLin clone with 0.96” SSD1306 monochrome OLED display
• Unpacking the Geekcreit PCA9685 I2C Shield 16 Servos + 2 DC motors for Arduino or ESPDuino (ESP8266)