Created
April 3, 2020 00:23
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I2C scanner for Arduino, ESP32, ESP8266 ...
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#include <Arduino.h> | |
#include <Wire.h> | |
void setup() | |
{ | |
Wire.begin(); | |
Serial.begin(9600); | |
while (!Serial); | |
Serial.println("\nI2C Scanner"); | |
} | |
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); // wait 5 seconds for next scan | |
} |
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