Blynk CDS light sensor Turning on/off the lights

Blynk  數值顯示器 (Value Display) :

此種顯示元件有四個, 可以綁定硬體設備的 Digital/Analog/Virtual 輸出腳, 主要差別是元件外觀的大小與是否具有將輸出資料格式化的功能 :

1. Value Display S : 數值顯示器 (短)
2. Value Display M : 數值顯示器 (中)
3. Labeled Value M : 格式化的數值顯示器 (中)
4. Labeled Value L : 格式化的數值顯示器 (長)

 Blynk 有三個通知元件 :

1. Twitter : 傳送訊息到個人的推特
2. Email : 傳送訊息到指定郵件信箱
3. Push : 推送訊息到手機 

#define BLYNK_PRINT Serial    // Comment this out to disable prints and save space

#include <ESP8266WiFi.h>

#include <BlynkSimpleEsp8266.h>

#include <SimpleTimer.h>

SimpleTimer timer;

// You should get Auth Token in the Blynk App.

// Go to the Project Settings (nut icon).

char auth[] = "46wqwr1366bb2e7d46b7b0a0d4d785da7c3b";

// Your WiFi credentials.

// Set password to "" for open networks.

char ssid[] = "74170287";

char pass[] = "24063173";

//set name/sensor pin and a name for its value

int sensor_light = A0;                          //connect light sensor to A0 pin on nodemcu

int LEDRELAY = 2 ;

int value_light;

//include timer library and start timer function

//start a task named "light"

void light()

{

    value_light = analogRead(sensor_light);               //everytime called for value_light, get an analog reading from sensor set above

    Blynk.virtualWrite(V2, value_light);                //virtually write sensor read value to blynk server

    Serial.print("analogRead(sensor_light)=");

    Serial.println(value_light);

    if (value_light < 300) {                    //if light sensor value is below set number then turn on AC

        Blynk.email("alex9ufo@gmail.com", "sun down", "turning on lights");  

        digitalWrite (LEDRELAY, LOW);                     //relay on 

        Serial.println("turning on lights");

     }else{                            

        Blynk.email("alex9ufo@gmail.com", "sun up", "turning off lights"); 

        digitalWrite (LEDRELAY, HIGH);                          //relay off

        Serial.println("turning off lights");

        }

}

void setup()

{

    pinMode (LEDRELAY, OUTPUT);            //add relay module on pin D2, 4

    digitalWrite (LEDRELAY, LOW);          //keep relay off while device turning on

    Serial.begin(9600);                     //Set console baud rate

    Blynk.begin(auth, ssid, pass);        //enter your location wifi name/password

    timer.setInterval(5000, light);     //run light task every 5 seconds

}

void loop() {

    Blynk.run();                //start blynk

    timer.run();                //start timer

}