【Arduino】4.I2C LCD1602屏幕的使用

本文为旧博客迁移的文章

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
 
// set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x3F,16,2); 
 
void setup(){
  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
}
 
void loop(){ }

//Find Address
#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
}

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

GND-GND

VCC-5V

SDA-A4

SCL-A5