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 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(” I2C 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 “);
else
Serial.println(“done “);
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。
创建日期：2018.05.06
更新日期：2022.02.19
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