Arduino中使用I2C通信可直接調用Wire.h庫, 這個庫允許Arduino鏈接其他I2C設備, 鏈接線有兩條, 分別是SDA(數據行)和SCI(時鐘線). 各型號Arduino的I2C對應引腳:

Arduino Board：I2C / TWI pins

Arduino Uno/Ethernet：A4 (SDA), A5 (SCL)

Arduino Mega2560：20 (SDA), 21 (SCL)

Arduino Leonardo：2 (SDA), 3 (SCL)

Arduino Due：20 (SDA), 21 (SCL), SDA1, SCL1

一般購買到的是分開的兩個組件, 需要按下圖這樣將PCF8574T焊接到1602LCD上

PCF8574T模塊4pin(Gnd, Vcc, SDA i2c數據, SCL i2c時鐘)和Arduino接口的對應關系: Gnd -> Gnd, Vcc -> Vcc, SDA -> A4, SDL -> A5

獲取I2C地址

#include

voidsetup() {

Serial.begin (115200); //Leonardo: wait for serial port to connect

while (!Serial) { }

Serial.println ();

Serial.println ("I2C scanner. Scanning ...");byte count = 0;

Wire.begin();for (byte i = 8; i < 120; i++) {

Wire.beginTransmission (i);if (Wire.endTransmission () == 0) {

Serial.print ("Found address:");

Serial.print (i, DEC); Serial.print ("(0x");

Serial.print (i, HEX); Serial.println (")");

count++; delay (1); //maybe unneeded?

} //end of good response

} //end of for loop

Serial.println ("Done.");

Serial.print ("Found");

Serial.print (count, DEC);

Serial.println ("device(s).");

}//end of setup

void loop() {}

運行時, 打開Serial Monitor, 將波特率設為115200, 看到的輸出就是I2C地址

自帶LiquidCrystal_I2C顯示測試

在運行顯示測試前檢查是否已經安裝了library: LiquidCrystal, LiquidCrystal_I2C

#include #include

//I2C地址, 一般為0x3F, 0x20或0x27

LiquidCrystal_I2C lcd(0x27,16,2);voidsetup() {

lcd.init();

lcd.backlight();//打開背光

}voidloop() {

lcd.setCursor(0,0);

lcd.print("LCD1602 iic Test");

lcd.setCursor(0,1);

lcd.print("0123456789ABCDEF");

delay(1000);

}

如果屏幕亮但是無顯示, 可以調節背后的電位器讓字符顯示到合適的對比度.

第三方New LiquidCrystal顯示測試

#include #include#includeLiquidCrystal_I2C lcd(0x27,2,1,0,4,5,6,7); //0x27 is the I2C bus address for an unmodified backpack

void setup() { //activate LCD module

lcd.begin (16,2); //for 16 x 2 LCD module

lcd.setBacklightPin(3,POSITIVE);

lcd.setBacklight(HIGH);

}voidloop() {

lcd.home ();//set cursor to 0,0

lcd.print("HELLO WORLD....");

lcd.setCursor (0,1); //go to start of 2nd line

lcd.print(millis());

delay(1000);

lcd.setBacklight(LOW);//Backlight off

delay(1000);

lcd.setBacklight(HIGH);//Backlight on

}

供電和耗電測試

硬件是Arduino NANO + 擴展板 + PCF8574T + 1602LCD, 使用輸入電壓12V. 擴展板本身不帶IC, 只有一個電源LED, 功耗可以忽略. 在使用自帶的LiquidCrystal_I2C庫跑上面的測試代碼時, 測得的功耗僅為0.95W左右.

總結

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