// set the LCD address to 0x27 for a 16 chars and 2 line display LiquidCrystal_I2C lcd(0x3F,16,2);
voidsetup(){ lcd.init(); // initialize the lcd lcd.backlight(); //Open the backlight lcd.print("Welcome to "); // Print a message to the LCD. lcd.setCursor(0,1); //newline lcd.print("www.csdn.com");// Print a message to the LCD }
//Find Address #include<Wire.h> voidsetup(){ Wire.begin(); Serial.begin(9600); Serial.println("\nI2C Scanner"); } voidloop(){ 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++; } elseif (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 }
开发中遇到的问题
屏幕无显示 调节后面的对比度,查看
一行黑点 地址错误,使用代码二查看地址,然后修改代码一。
如何连接跳线
1 2 3 4 5 6 7
GND-GND
VCC-5V
SDA-A4
SCL-A5
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