ESP32: i2c のスキャン

こちらのページと同じことを行いました。
Wire/examples/i2c_scanner/i2c_scanner.ino

Ubuntu 24.04 上の Arduino IDE 2.3.2 を使いました。

プログラム

i2c_scanner.ino

// ---------------------------------------------------------------------
//	i2c_scanner.ino
//
//						Feb/06/2023
// ---------------------------------------------------------------------
#include <Wire.h>

#define	PROGRAM	"i2c_scanner.ino"
#define	VERSION	"2023-2-6 AM 08:37"

// ---------------------------------------------------------------------
void setup()
{
	Wire.begin();

	Serial.begin(115200);
	delay(3000);
	Serial.println(PROGRAM);
	Serial.println(VERSION);
	Serial.println();
}


// ---------------------------------------------------------------------
void loop()
{
	byte error, address;
	int nDevices;

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

	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 found at address 0x");
			if (address<16) 
				Serial.print("0");
			Serial.print(address,HEX);
			Serial.println("	!");

			nDevices++;
		}
		else if (error==4) 
		{
			Serial.print("Unknown error at address 0x");
			if (address<16) 
				Serial.print("0");
			Serial.println(address,HEX);
		}		
	}
	if (nDevices == 0)
		Serial.println("No I2C devices found\n");
	else
		Serial.println("done\n");

	delay(5000);
}

// ---------------------------------------------------------------------

実行結果

Scanning...
I2C device found at address 0x1E	!
done