universal I2C-Scanner

This small project is for scanning for I2C devices on the I2C bus of a microcontroller. I initially used the I2C scanner from the Arduino Playground as a basis.

I2C Pins at Microcontroller

Here is a small table with I2C pins of the most popular microcontrollers. (Of course this is not exhaustive).

Microcontroller	SDA	SCL
Arduino UNO, Arduino Nano	A5	A4
Arduino Micro	D2	D3
Arduino Mega 2560 R3	D20	D21
Arduino DUE	D20	D21
Wemos D1 Mini - ESP8266	D2 (GPIO04)	D1 (GPIO05)
ESP8266 - Ideaspark	D6 (GPIO12)	D5 (GPIO14)
ESP32	GPIO21	GPIO21
ESP32 S3	GPIO08	GPIO09

predefined microcontroller

I have already predefined some microcontrollers (file boards.h).

#if defined(ARDUINO_ESP8266_GENERIC)
    #define  otherBoard
    //Boardconfiguration for Heltec HTIT-W8266 board with oboard OLED Display
    BoardConfiguration bc = { "Generic ESP8266 Module", 1, { { 16, 24 } } };

You find the definions in %user%\AppData\Local\Arduino15\packages*\hardware...\boards.txt.

Example: %user%\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11

Output

An Generic ESP8266 Module was recognized!
The microcontroller has 1 I2C Interfaces!
	[0] SDA: 4, SCL: 5
		Scanning...
		I2C device found at address 0x3c!
End.