第一個程式碼

#include <LiquidCrystal_I2C.h>

#include <Wire.h> // 此庫已內置於 Arduino IDE 中

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup()

{

Serial.begin(115200);

Wire.begin(D2,D1);

lcd.init(); // 初始化 LCD

lcd.backlight(); // 開啟或開啟背光

lcd.setCursor(0, 0);

lcd.print("ERIC | 16x2 LCD TEST"); // 開始將文字列印到第一行

lcd.setCursor(0, 1);

lcd.print("-----------------------"); // 開始列印測試到第二行

}

void loop()

{

// Nothing Absolutely Nothing!

}

第二個程式碼

#include <DHT11.h>

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2); //設置LCD1602的I2C位址為0x27，LCD1602

//為兩行，每行16個字元的液晶顯示器

int pin=14;

DHT11 dht11(pin);

void setup()

{

lcd.init(); // 給LCD的I2C通訊初始化

lcd.backlight(); // 點亮LCD背光燈

}

void loop()

{

int err;

float temp, humi;

if((err=dht11.read(humi, temp))==0)

{

lcd.setCursor(0, 0);

lcd.print("Temp=");

lcd.print(temp);

lcd.setCursor(0, 1);

lcd.print("Humi=");

lcd.print(humi);

}

else

{

lcd.setCursor(0, 0);

lcd.print("error !");

}

delay(DHT11_RETRY_DELAY); //delay for reread

}

第三個程式碼

#include <ESP8266WiFi.h>

#ifndef STASSID

#define STASSID "xxxxxxx"

#define STAPSK "nnnnnnnnn"

#endif

String apiKey ="Your API of thingsspeak"; // 從 ThingSpeak 輸入寫入 API 金鑰(看下頁圖示填入)

const char* ssid = STASSID;

const char* password = STAPSK;

const char* server = "api.thingspeak.com";

#include <DHT11.h>

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2); //設置LCD1602的I2C位址為0x27，LCD1602

//為兩行，每行16個字元的液晶顯示器

int pin=14;

DHT11 dht11(pin); //連接 dht11 的引腳

WiFiClient client;

void setup() {

Serial.begin(115200);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(".");

}

Serial.println("");

Serial.println("WiFi connected");

lcd.init(); // 給LCD的I2C通訊初始化

lcd.backlight(); // 點亮LCD背光燈

}

void loop()

{

int err;

float temp, humi;

if((err=dht11.read(humi, temp))==0)

{

lcd.setCursor(0, 0);

lcd.print("Temp=");

lcd.print(temp);

lcd.setCursor(0, 1);

lcd.print("Humi=");

lcd.print(humi);

}

else

{

lcd.setCursor(0, 0);

lcd.print("error !");

}

delay(DHT11_RETRY_DELAY); //delay for reread

float h = humi;

float t = temp;

if (isnan(h) || isnan(t))

{

Serial.println("Failed to read from DHT sensor!");

return;

}

if (client.connect(server,80)) // "184.106.153.149" or api.thingspeak.com

{

String postStr = apiKey;

postStr +="&field1=";

postStr += String(t);

postStr +="&field2=";

postStr += String(h);

postStr += "\r\n\r\n";

client.print("POST /update HTTP/1.1\n");

client.print("Host: api.thingspeak.com\n");

client.print("Connection: close\n");

client.print("X-THINGSPEAKAPIKEY: "+apiKey+"\n");

client.print("Content-Type: application/x-www-form-urlencoded\n");

client.print("Content-Length: ");

client.print(postStr.length());

client.print("\n\n");

client.print(postStr);

Serial.print("Temperature: ");

Serial.print(t);

Serial.print(" degrees Celcius, Humidity: ");

Serial.print(h);

Serial.println("%. Send to Thingspeak.");

}

client.stop();

Serial.println("Waiting...");

// thingspeak needs minimum 15 sec delay between updates

delay(1000);

}