如何用Arduino查询LCD1602液晶屏 I2C的初始地址是0x3f还是0x27？
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 unoGND ———— GNDVCC ———— 5VSDA ———— A4SCL ———— 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https://img.xiaodingchui.com/2018/09/s-1.png通过上面我们已经可以看到扫描的结果了。原文 https://www.xiaodingchui.com/7831
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