ThingSpeak + ESP12 Test Board + 細懸浮微粒(PM2.5)

細懸浮微粒(PM2.5)

目的:

使用ESP8266  ESP-12 Tools Board 類比輸入A0來讀取PM2.5感測器的電壓值，轉換成PM2.5 之值，GPIO16 來讀取DHT11溫度溼度感測器的值。

硬體 (電子元件):

1)麵包板 x 1

2)ESP8266  ESP-12 Tools Board 主板 x 1

3)DHT11 x1 溫度溼度感測器

4)SHARP 原裝夏普 GP2Y1010AU0F PM2.5感測器 x1     +  220uf  150歐姆

5) 3.3V/5V Linear Regulator Voltage x1

軟體: 

1)Arduino IDE 1.6.5版本
2) DHT.zip
3) ThingSpeak API Key + Channel Setting
4) 留意  ESP8266  ESP-12 Tools Board --uploading 接線
5) Arduino IDE  ESP8266 board from Tools > Board > Generic ESP8266 Module

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//參考 http://www.arduinesp.com/thingspeak  

#include <ESP8266WiFi.h>

#include <dht.h>   

// replace with your channel's thingspeak API key, 

String apiKey = "TW60RSJ9YFYLQRGK";   // your channel's thingspeak API key

const char* ssid = "74170287";        // your WIFI SSID

const char* password = "24063173";    // your WIFI Password

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

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

#define dht_dpin 16  //定義訊號要從進來  

dht DHT;   

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

int measurePin = A0; // ADC  Connect dust sensor to Arduino A0 pin 

int ledPower = 14;   //Connect 3 led driver pins of dust sensor to Arduino D2

int samplingTime = 280;

int deltaTime = 40;

int sleepTime = 9680;

long updateInterval = 250;               //傳送資料時間間隔)

float voMeasured = 0;

float calcVoltage = 0;

float dustDensity = 0;

float h=0;

float t=0;

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

WiFiClient client;

 

void setup() {                

  Serial.begin(115200);

  delay(10);

  pinMode(dht_dpin,INPUT);

  pinMode(measurePin,INPUT); 

  pinMode(ledPower,OUTPUT);   

  

  WiFi.begin(ssid, password);

 

  Serial.println();

  Serial.println();

  Serial.print("Connecting to ");

  Serial.println(ssid);

   

  WiFi.begin(ssid, password);

   

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

    delay(500);

    Serial.print(".");

  }

  Serial.println("");

  Serial.println("WiFi connected");

  

}

 

 

void loop() {

//++++++++++++++++++++++++++++++++++++++++++++++

  DHT.read11(dht_dpin);   //去library裡面找DHT.read11  

  h = DHT.humidity;

  t = DHT.temperature;

  if (isnan(h) || isnan(t)) {

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

    return;

  }

//++++++++++++++++++++++++++++++++++++++++++++++

  digitalWrite(ledPower,LOW); // power on the LED

  delayMicroseconds(samplingTime);

  voMeasured = analogRead(measurePin); // read the dust value

  delayMicroseconds(deltaTime);

  digitalWrite(ledPower,HIGH); // turn the LED off

  delayMicroseconds(sleepTime);

  // 0 - 5V mapped to 0 - 1023 integer values  5V change into 3.3V

  // recover voltage

  calcVoltage = voMeasured * (3.3 / 1024.0);   //5.0V change into 3.3

  // linear eqaution taken from http://www.howmuchsnow.com/arduino/airquality/

  // Chris Nafis (c) 2012

  if (calcVoltage < 0.583) {

       dustDensity = 0;

       }

   else{

        dustDensity = 6 * calcVoltage / 35 - 0.1;

         }

 

  dustDensity=dustDensity * 1000  ;     // 這裡將數值呈現改成較常用的單位( ug/m3 )

//++++++++++++++++++++++++++++++++++++++++++++++

   // dustDensity = 0.1714 * calcVoltage - 0.1;     // 6/35=0.1714 

  

  if (isnan(voMeasured) || isnan(calcVoltage) || isnan(dustDensity) ) {

    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);     //field1

           postStr +="&field2=";

           postStr += String(h);    //field2

           postStr +="&field3=";

           postStr += String(voMeasured);   //field3

           postStr +="&field4=";

           postStr += String(dustDensity);      //field4      

           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");  

    Serial.print("Raw Signal Value (0-1023): ");

    Serial.print(voMeasured);

    Serial.print(" - Voltage: ");

    Serial.print(calcVoltage);

    Serial.print(" - Dust Density: ");

    Serial.print(dustDensity ); // 這裡將數值呈現改成較常用的單位( ug/m3 )

    Serial.println(" ug/m3 ");

  

   }

 

  client.stop();

  Serial.println("Waiting...");    

  // thingspeak needs minimum 15 sec delay between updates

  delay(20000);  

}