如何用Arduino查询LCD1602液晶屏 I2C的初始地址是0x3f还是0x27？

victor

经过本人测试有效，特地写出教程供广大爱好者阅读。

第一步：.连线arduino和LCD1602显示器

LCD1602—–arduino uno

GND ———— GND

VCC ———— 5V

SDA ———— A4

SCL ———— A5

第二部，上传程序#include <Wire.h> void setup(){  Wire.begin();  Serial.begin(9600);  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("Unknow 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}第三部，打开串口监视

通过上面我们已经可以看到扫描的结果了。

victor

原文 https://www.xiaodingchui.com/7831