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#include <Wire.h> void setup() { Wire.begin(); } void loop() { scanI2cBus(); delay(1000); } void scanI2cBus() { byte error, address; int nDevices; nDevices = 0; for(address = 0; address <= 127; 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); nDevices++; } else if(error==4) { Serial.print("Unknow error at address 0x"); if (address<16) Serial.print("0"); Serial.println(address,HEX); } } if (nDevices == 0) Serial.println("No I2C device found"); Serial.println(); } |