ESP8266 , Arduino UNO ThingSpeak Temperature & Humidity Monitor

//Its code

// Code to use SoftwareSerial

#include <SoftwareSerial.h>

SoftwareSerial espSerial = SoftwareSerial(2,3);// arduino RX pin=2 arduino TX pin=3 connect the arduino RX pin to esp8266 module TX pin - connect the arduino TX pin to esp8266 module RX pin

#include <DHT.h> //Attention: For new DHT11 version library you will need the Adafruit_Sensor library

//Download from here: https://github.com/adafruit/Adafruit_Sensor

// LCD RS=7, EN=8, DS4=9, DS5=10, DS6=11, DS7=12

#include <LiquidCrystal.h>

LiquidCrystal lcd( 7, 8, 9, 10, 11, 12);

//Attention: For new DHT11 version libraries you will need the Adafruit_Sensor library

//Download from here:https://github.com/adafruit/Adafruit_Sensor

//and install to Arduino software

#define DHTPIN 6 // Connect the signal pin of DHT11 sensor to digital pin 6

#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

String apiKey = "CUGPJYT9VKOZM1RT"; // replace with your channel's thingspeak WRITE API key

String ssid="DESKTOP-KD"; // Wifi network SSID

String password ="912345678"; // Wifi network password

boolean DEBUG=true;

//======================================================================== showResponce

void showResponse(int waitTime){

long t=millis();

char c;

while (t+waitTime>millis()){

if (espSerial.available()){

c=espSerial.read();

if (DEBUG) Serial.print(c);

}

}

}

//========================================================================

boolean thingSpeakWrite(float value1, float value2){

String cmd = "AT+CIPSTART=\"TCP\",\""; // TCP connection

cmd += "184.106.153.149"; // api.thingspeak.com

cmd += "\",80";

espSerial.println(cmd);

if (DEBUG) Serial.println(cmd);

if(espSerial.find("Error")){

if (DEBUG) Serial.println("AT+CIPSTART error");

return false;

}

String getStr = "GET /update?api_key="; // prepare GET string

getStr += apiKey;

getStr +="&field1=";

getStr += String(value1);

getStr +="&field2=";

getStr += String(value2);

// getStr +="&field3=";

// getStr += String(value3);

// ...

getStr += "\r\n\r\n";

// send data length

cmd = "AT+CIPSEND=";

cmd += String(getStr.length());

espSerial.println(cmd);

if (DEBUG) Serial.println(cmd);

delay(100);

if(espSerial.find(">")){

espSerial.print(getStr);

if (DEBUG) Serial.print(getStr);

}

else{

espSerial.println("AT+CIPCLOSE");

// alert user

if (DEBUG) Serial.println("AT+CIPCLOSE");

return false;

}

return true;

}

//================================================================================ setup

void setup() {

lcd.begin(16, 2);

lcd.clear();

lcd.print("Humidity & Temp");

lcd.setCursor(0,1);

lcd.print(" Measurement ");

delay(2000);

lcd.clear();

lcd.print("VicinityInfoIndia");

lcd.setCursor(0,1);

lcd.print("Welcomes You");

delay(2000);

Serial.begin(9600);

lcd.clear();

lcd.print("WIFI Connecting");

lcd.setCursor(0,1);

lcd.print("Please wait....");

DEBUG=true; // enable debug serial

Serial.begin(9600);

dht.begin(); // Start DHT sensor

espSerial.begin(9600); // enable software serial

// Your esp8266 module's speed is probably at 115200.

// For this reason the first time set the speed to 115200 or to your esp8266 configured speed

// and upload. Then change to 9600 and upload again

espSerial.println("AT+RST"); // Enable this line to reset the module;

showResponse(1000);

espSerial.println("AT+UART_CUR=9600,8,1,0,0"); // Enable this line to set esp8266 serial speed to 9600 bps

showResponse(1000);

espSerial.println("AT+CWMODE=1"); // set esp8266 as client

showResponse(1000);

espSerial.println("AT+CWJAP=\""+ssid+"\",\""+password+"\""); // set your home router SSID and password

showResponse(5000);

if (DEBUG) Serial.println("Setup completed");

delay(1500);

lcd.clear();

lcd.print("WIFI Connected.");

delay(1000);

lcd.setCursor(0,1);

lcd.print("Setup comleted");

delay(3000);

}

// ====================================================================== loop

void loop() {

// Read sensor values

float t = dht.readTemperature();

float h = dht.readHumidity();

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

if (DEBUG) Serial.println("Failed to read from DHT");

}

else {

if (DEBUG) Serial.println("Temp="+String(t)+" *C");

lcd.setCursor(0,0);

lcd.print("Temperature:");

lcd.print(t);

if (DEBUG) Serial.println("Humidity="+String(h)+" %");

lcd.setCursor(0,1);

lcd.print("Humidity: ");

lcd.print(h);

thingSpeakWrite(t,h); // Write values to thingspeak

}

// thingspeak needs 15 sec delay between updates,

delay(16000);

}