Created
March 1, 2024 12:33
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I2C Scanner
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#include <Wire.h> | |
void setup() { | |
Serial.begin(115200); // Start serial communication at 115200 baud rate | |
while (!Serial); // Wait for serial port to connect | |
Serial.println("\nI2C Scanner"); | |
Wire.begin(); // Initialize I2C communication | |
} | |
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 the next scan | |
} | |
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