IoT HVAC Monitor

/*
 IoT HVAC Monitor
 by My Parts Chest
 https://mypartschest.com
 July 2018 
*/

#include <ESP8266WiFi.h>
#include "ThingSpeak.h"
#include <DHTesp.h>
DHTesp dht;

// WiFi and Channel parameters
const char WIFI_SSID[] = "xxxxxxxxxx";
const char WIFI_PSK[] = "xxxxxxxxxx";
unsigned long CHANNEL_ID = 123456;
const char * WRITE_API_KEY = "xxxxxxxxxxxxxxxxxxx";

// Pin definitions
const int LED_PIN = 5; // Thing's onboard, green LED
const int ANALOG_PIN = A0; // The only analog pin on the Thing
const int DIGITAL_PIN = 14; // Digital pin to be read

// Global variables
WiFiClient client;
int OnOff = 0;

void setup() {
  //start serial
  Serial.begin(115200);

  // Set up LED for debugging
  pinMode(LED_PIN, OUTPUT);
  pinMode(DIGITAL_PIN, INPUT);

  //setup dht11
  dht.setup(DIGITAL_PIN, DHTesp::DHT11); // Connect DHT sensor
  
  // Connect to WiFi
  connectWiFi();
  
  // Initialize connection to ThingSpeak
  ThingSpeak.begin(client);

}

void loop() {

  // Call rht.update() to get new humidity and temperature values from the sensor.
  int analogReading = analogRead(ANALOG_PIN);

  float volts = (analogPIN / 1023.0);
  Serial.print("Voltage: ");
  Serial.println(volts);
  
  if (analogPIN > 25) //ignore noise
  {
    OnOff = 1;
  }
  else
  {
    OnOff = 0;
  }

  //get temp and humidity
  float humidity = dht.getHumidity();
  float temperature = dht.getTemperature();
  float tempInF = dht.toFahrenheit(temperature);
  
  //display temp and humidity
  Serial.print("Temperature (C): ");
  Serial.println(temperature, 1);
  Serial.print("Temperature (F): ");
  Serial.println(tempInF, 1);
  Serial.print("Humidity: ");
  Serial.println(humidity, 1);
  Serial.println();
  
  // If successful, push values to ThingSpeak.
  if (analogReading > 0)
  {
    // Turn LED on when sending data
    digitalWrite(LED_PIN, HIGH);
    Serial.println("Sending Data to Thingspeak..." );
    // Write the values to ThingSpeak channel
    ThingSpeak.setField(1, volts);
    ThingSpeak.setField(2, OnOff);
    ThingSpeak.setField(3, tempInF);
    ThingSpeak.setField(4, humidity);
    ThingSpeak.writeFields(CHANNEL_ID, WRITE_API_KEY);
    Serial.println("Data Sent" );
	digitalWrite(LED_PIN, LOW);
  }

  //Send data only once per minute
  delay(60000);
}

// Attempt to connect to WiFi
void connectWiFi() {

  delay(1000);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(WIFI_SSID);
  
  byte led_status = 0;

  // Set WiFi mode to station (client)
  WiFi.mode(WIFI_STA);

  // Initiate connection with SSID and PSK
  WiFi.begin(WIFI_SSID, WIFI_PSK);

  // Blink LED while we wait for WiFi connection
  while ( WiFi.status() != WL_CONNECTED ) {
    digitalWrite(LED_PIN, led_status);
    led_status ^= 0x01;
    delay(100);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  
  // Turn LED off when we are connected
  digitalWrite(LED_PIN, LOW);
}