液晶顯示器

#include <Wire.h>

void setup()

{

  Serial.begin (115200);  

  Wire.begin (21, 22);   // sda= GPIO_21 /scl= GPIO_22

}

void Scanner ()

{

  Serial.println ();

  Serial.println ("I2C scanner. Scanning ...");

  byte count = 0;

  Wire.begin();

  for (byte i = 8; i < 120; i++)

  {

    Wire.beginTransmission (i); // Begin I2C transmission Address (i)

    if (Wire.endTransmission () == 0) //0=success(ACK response) 

    {

      Serial.print ("Found address: ");

      Serial.print (i, DEC);

      Serial.print (" (0x");

      Serial.print (i, HEX);     // PCF8574 7 bit address

      Serial.println (")");

      count++;

    }

  }

  Serial.print ("Found ");      

  Serial.print (count, DEC);        // numbers of devices

  Serial.println (" device(s).");

}

void loop()

{

  Scanner ();

  delay (5000);

}

#include <Wire.h> 

#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 for a 16 chars and 2 line display

LiquidCrystal_I2C lcd(0x27, 16, 2);//0x27為裝置位址

// esp32   sda= GPIO_21 /scl= GPIO_22 

void setup()

{

// initialize the LCD

lcd.begin();

// Turn on the blacklight and print a message.

lcd.backlight();

lcd.print("Hello, world!");

  lcd.setCursor(0,1);//設定游標

  lcd.print("CPshs.hcc.edu.tw!"); //印出文字

}

void loop()

{

// Do nothing here...

}

/**

 * Displays text sent over the serial port (e.g. from the Serial Monitor) on

 * an attached LCD.

 */

#include <Wire.h> 

#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 for a 16 chars and 2 line display

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup()

{

lcd.begin();

lcd.backlight();

// Initialize the serial port at a speed of 9600 baud

Serial.begin(9600);

}

void loop()

{

// If characters arrived over the serial port...

if (Serial.available()) {

// Wait a bit for the entire message to arrive

delay(100);

// Clear the screen

lcd.clear();

// Write all characters received with the serial port to the LCD.

while (Serial.available() > 0) {

lcd.write(Serial.read());

}

}

}

// ===== LCD顯示溫濕度 =====

#include  <Wire.h>    //掛載Wire.h標頭檔

#include  <LiquidCrystal_I2C.h> //掛載LiquiaCrystal_I2C.h標頭檔

const int Address=0x27;   //宣告I2C位址

LiquidCrystal_I2C  I2C_LCD(Address,16,2); //建構LiquiaCrystal_I2C.h物件

// sda= GPIO_21 /scl= GPIO_22 

byte degree[]={ 

        0b00110,

        0b01001,

        0b01001,

        0b00110,

        0b00000,

        0b00000,

        0b00000,

        0b00000 };

#include <DHT.h>

const int dhtPin=04;    //宣告04腳連接dhtPin信號

DHT myDHT(dhtPin,DHT11);

float tempC=0.0,tempF=0.0,RH=0.0;

//宣告攝氏溫度(tempC)、華氏溫度(tempF)與濕度(RH)之變數

const int dipPin=39;    //宣告39腳連接dipPin信號

//初始設定

void setup() {

  I2C_LCD.begin();      //啟用LCD

  I2C_LCD.backlight();      //開啟LCD背光

  I2C_LCD.createChar(0,degree); //載入自建字元

  myDHT.begin();        //啟用DHT11

  pinMode(dipPin, INPUT);//設定攝氏、華氏溫度切換

}

//主程式

void loop() {

  int dip = digitalRead (dipPin);       //讀取指撥開關

  I2C_LCD.home();         //啟用LCD歸位

  I2C_LCD.print("Temp. : ");      //顯示Temp. :

  if (dip) {              //指撥開關切到OFF位置(攝氏溫度)

    tempC = myDHT.readTemperature(0); //讀取攝氏溫度

    I2C_LCD.setCursor(8,0);       //游標移至(8,0)位置

    I2C_LCD.print(tempC);       //顯示攝氏溫度

    I2C_LCD.setCursor(14,0);    //游標移至(14,0)位置

    I2C_LCD.write(0);         //顯示度

    I2C_LCD.print("C");       //顯示C

  }

  else  {                 //指撥開關切到ON位置(華氏溫度)

    tempF = myDHT.readTemperature(1); //讀取華氏溫度

    I2C_LCD.setCursor(8,0);       //游標移至(8,0)位置

    I2C_LCD.print(tempF);       //顯示華氏溫度

    I2C_LCD.setCursor(14,0);    //游標移至(14,0)位置

    I2C_LCD.write(0);         //顯示度

    I2C_LCD.print("F");       //顯示F

  }

  RH = myDHT.readHumidity();      //讀取濕度

  I2C_LCD.setCursor(0,1);       //游標移至(0,1)位置

  I2C_LCD.print("Humi. : ");      //顯示Humi. :

  I2C_LCD.print(RH);        //顯示度

  I2C_LCD.print("%RH");       //顯示%RH

  delay(500);           //暫停0.5秒

}