Arduino - IIC SCANNER

最新推荐文章于 2025-09-28 14:52:53 发布

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本文介绍了一个基于Arduino平台的I2C设备扫描程序。该程序利用Wire库进行I2C通信，通过串口输出连接到总线上的设备地址。程序能够识别有效设备并报告未知错误。

#include <Wire.h>

#define SERIAL_BAUD 57600 

void setup()
{
  Wire.begin();

  Serial.begin(SERIAL_BAUD);
  Serial.println("I2C Scanner started");
  Serial.println();
}


void loop()
{
  uint8_t error, i2cAddress, devCount, unCount;

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

  devCount = 0;
  unCount = 0;
  for(i2cAddress = 1; i2cAddress < 127; i2cAddress++ )
  {
    Wire.beginTransmission(i2cAddress);
    error = Wire.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C device found at 0x");
      if (i2cAddress<16) Serial.print("0");
      Serial.println(i2cAddress,HEX);
      devCount++;
    }
    else if (error==4)
    {
      Serial.print("Unknow error at 0x");
      if (i2cAddress<16) Serial.print("0");
      Serial.println(i2cAddress,HEX);
      unCount++;
    }    
  }

  if (devCount + unCount == 0)
    Serial.println("No I2C devices found\n");
  else {
    Serial.print(devCount);
    Serial.print(" device(s) found");
    if (unCount > 0) {
      Serial.print(", and unknown error in ");
      Serial.print(unCount);
      Serial.print(" address");
    }
    Serial.println();
  }
  Serial.println();
  delay(5000); 
}