ESP32 - I2C Scanner

What is I2C -
I2C stands for Inter-Integrated Circuit. I2C is a simple two-wire serial protocol used to communicate between two devices or chips in an embedded system. I2C has two lines SCL and SDA, SCL is used for clock and SDA is used for data. I2C communication protocol combines the best features of SPI and UART.

It is a synchronous, multi-master/multi-slave (controller/target), single-ended, serial communication bus.

Step 1: Connect Board to Laptop

Step 2: Connect any I2C board to the ESP32 board

Spte 3 - load I2C Scanner Example Code

Select boar ESP32 DEV Module from Tools >> Boards menu, then select appropriate com port. Upload this program to ESP32.

/*

https://www.cheers2engineering.com/guided-projects/advanced-grades-9-12/esp32-module/i2c-scanner

I2CScanner - to locate I2C devices, and display I2C if a device is connected ESP32

ON Board SDA - 23, SCL - 19

*/

#include <Wire.h>

void setup() {

Wire.begin(23,19); //sda - 23, scl - 19

Serial.begin(115200);

Serial.println("I2C Scanner");

}

void loop() {

byte error, address;

int connectedDevices;

Serial.println("Scanning...");

connectedDevices = 0;

for(address = 1; address < 127; address++ ) {

Wire.beginTransmission(address);

error = Wire.endTransmission();

if (error == 0) { //device found

Serial.print("I2C device found at address 0x");

if (address<16) {

Serial.print("0");

}

Serial.println(address,HEX);

connectedDevices++;

}

else if (error==4) {

Serial.print("Unknown error at address 0x");

if (address<16) {

Serial.print("0");

}

Serial.println(address,HEX);

}

if (connectedDevices == 0) {

Serial.println("No I2C devices found");

}

else {

Serial.println("done");

}

delay(5000);

}

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