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
5) 3.3V/5V Linear Regulator Voltage x1
6) 220uf 150歐姆
軟體:
1)Arduino IDE 1.6.5版本
2) DHT.zip
3) Blynk
4) Android 手機安裝Blynk 軟體 App程式
5) 留意 ESP8266 ESP-12 Tools Board --uploading 接線
6) Arduino IDE ESP8266 board from Tools > Board > Generic ESP8266 Module
http://www.whatimade.today/esp8266-easiest-way-to-program-so-far/
/*
=================================================================
Connect the USB-TTL to pc and upload sketch to ESP-12
Note: GPIO0 should be LOW
CH_PD and RST should be HIGH for first time flashing the board
GPIO0 should be LOW when uploading sketches
Remember use a 3.3V USB-TTL
connect RX of board to TX of usb and TX of board to RX
SKETCH:
edit auth code, ssid and pass
=================================================================
*/
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#define BLYNK_PRINT Serial // Comment this out to disable prints and save space
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#include <dht.h>
#define dht_dpin 16 //定義DHT11訊號要從GPIO16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;
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "605989b5204247989352d86301a4c4e9"; //Blynk Auth Token : 605989b5204247989352d86301a4c4e9
char ssid[] = "74170287";
char pass[] = "24063173";
void setup() {
Serial.begin(9600); //Set console baud rate
pinMode(ledPower,OUTPUT);
pinMode(dht_dpin,OUTPUT);
Blynk.begin(auth, ssid, pass); // auth, ssid, pass ;
}
void loop() {
Blynk.run();
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
// recover voltage
calcVoltage = voMeasured * (3.3 / 1024.0); //5V change into 3,3V
// 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;
}
Serial.print("Raw Signal Value (0-1023): ");
Serial.print(voMeasured);
Serial.print(" - Voltage: ");
Serial.print(calcVoltage);
Serial.print(" - Dust Density: ");
Serial.print(dustDensity * 1000); // 這裡將數值呈現改成較常用的單位( ug/m3 )
Serial.println(" ug/m3 ");
float T=dustDensity * 1000 ;
Blynk.virtualWrite(V0, voMeasured);
Blynk.virtualWrite(V1, calcVoltage);
Blynk.virtualWrite(V2, T);
//++++++++++++++++++++++++++++++++++++++++++++++
DHT.read11(dht_dpin); //去library裡面找DHT.read11
float h = DHT.humidity;
float t = DHT.temperature;
float f = t * 9/5 + 32;
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
Serial.print("Humidity: ");
Serial.print(h);
Serial.print("%\t");
Serial.print("Temperature: ");
Serial.print(t);
Serial.print("*C\t");
Serial.print(f);
Serial.print("*F\n");
Blynk.virtualWrite(V3, h);
Blynk.virtualWrite(V4, t);
//++++++++++++++++++++++++++++++++++++++++++++++
}
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