Arduino check I2C addresses
2023-04-27
This code can check I2C address from multiple devices
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | // -------------------------------------- // i2c_scanner // // Modified from https://playground.arduino.cc/Main/I2cScanner/ // -------------------------------------- #include <Wire.h> // Set I2C bus to use: Wire, Wire1, etc. #define WIRE Wire void setup() { WIRE.begin(); Serial.begin(9600); while (!Serial) delay(10); 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 } |