Jayraj Desai
Published © GPL3+

Personal Weather Station (Arduino+ ESP8266 + Thingspeak)

Wonder how much would be the temperature in your room? or what would be the humidity and pressure? This project would get you the answers.

IntermediateFull instructions provided5 hours80,179
Personal Weather Station (Arduino+ ESP8266 + Thingspeak)

Things used in this project

Hardware components

Adafruit BMP180
×1
DHT11 Temperature & Humidity Sensor (4 pins)
DHT11 Temperature & Humidity Sensor (4 pins)
×1
LDR
Light Dependent Resistor
×1
ESP8266 ESP-01
Espressif ESP8266 ESP-01
×1
Arduino Nano R3
Arduino Nano R3
×1
Resistor 4.75k ohm
Resistor 4.75k ohm
×1
Resistor 51K
×1
LM2596 DC-DC Buck Converter Step-Down Power Module
×1
DC jack
×1
switch
×1
12v-2A wall adapter
×1
PCB
×1
Male Header 40 Position 1 Row (0.1")
Male Header 40 Position 1 Row (0.1")
×1
Female Header 8 Position 1 Row (0.1")
Female Header 8 Position 1 Row (0.1")
×5
plastic box
×1

Software apps and online services

Arduino IDE
Arduino IDE
ThingSpeak API
ThingSpeak API

Hand tools and fabrication machines

wire stripper
Hot glue gun (generic)
Hot glue gun (generic)
Soldering iron (generic)
Soldering iron (generic)
screw driver
File
used for handcrafting

Story

Read more

Schematics

Fritzing Schematic

.fzz file

Code

Code

Arduino
#include <SoftwareSerial.h>
#include <Wire.h>
#include <dht.h>
#include <Adafruit_BMP085.h>

#define DEBUG 0                                     // change value to 1 to enable debuging using serial monitor  
#define dht_pin A0                                  // defining pin A0 for DHT sensor
#define lightSensor A1                              // defining pin A1 as input pin for LDR voltage divider

dht DHT;
Adafruit_BMP085 bmp;
SoftwareSerial esp8266Module(10, 11);               // RX, TX

String network = "----";                            // your access point SSID
String password = "-------------";                  // your wifi Access Point password
#define IP "184.106.153.149"                        // IP address of thingspeak.com
String GET = "GET /update?key=----------------";    // replace with your channel key


void setup()
{
  if(DEBUG){
    Serial.begin(9600);                             // Setting hardware serial baud rate to 9600
  }  
  esp8266Module.begin(9600);                        // Setting softserial baud rate to 9600
  if (!bmp.begin()) {
    if(DEBUG){
      Serial.println("Could not find a valid BMP085 sensor, check wiring!");
    }
    while (1) {}
  }
  delay(2000);
}

void loop() 
{
    setupEsp8266();                                   
    DHT.read11(dht_pin);
    double humi = DHT.humidity;
    double bmp_temp = bmp.readTemperature();
    double bmp_pressure = bmp.readPressure();
    int lightIntensity = analogRead(lightSensor);
    updateTemp(String(bmp_temp) ,String(lightIntensity),String(bmp_pressure),String(humi));
    delay(30000);
}

//-------------------------------------------------------------------
// Following function setup the esp8266, put it in station made and 
// connect to wifi access point.
//------------------------------------------------------------------
void setupEsp8266()                                   
{
    if(DEBUG){
      Serial.println("Reseting esp8266");
    }
    esp8266Module.flush();
    esp8266Module.println(F("AT+RST"));
    delay(7000);
    if (esp8266Module.find("OK"))
    {
      if(DEBUG){
        Serial.println("Found OK");
        Serial.println("Changing espmode");
      }  
      esp8266Module.flush();
      changingMode();
      delay(5000);
      esp8266Module.flush();
      connectToWiFi();
    }
    else
    {
      if(DEBUG){
        Serial.println("OK not found");
      }
    }
}

//-------------------------------------------------------------------
// Following function sets esp8266 to station mode
//-------------------------------------------------------------------
bool changingMode()
{
    esp8266Module.println(F("AT+CWMODE=1"));
    if (esp8266Module.find("OK"))
    {
      if(DEBUG){
        Serial.println("Mode changed");
      }  
      return true;
    }
    else if(esp8266Module.find("NO CHANGE")){
      if(DEBUG){
        Serial.println("Already in mode 1");
      }  
      return true;
    }
    else
    {
      if(DEBUG){
        Serial.println("Error while changing mode");
      }  
      return false;
    }
}

//-------------------------------------------------------------------
// Following function connects esp8266 to wifi access point
//-------------------------------------------------------------------
bool connectToWiFi()
{
  if(DEBUG){
    Serial.println("inside connectToWiFi");
  }  
  String cmd = F("AT+CWJAP=\"");
  cmd += network;
  cmd += F("\",\"");
  cmd += password;
  cmd += F("\"");
  esp8266Module.println(cmd);
  delay(15000);
  
  if (esp8266Module.find("OK"))
  {
    if(DEBUG){
      Serial.println("Connected to Access Point");
    }  
    return true;
  }
  else
  {
    if(DEBUG){
      Serial.println("Could not connect to Access Point");
    }  
    return false;
  }
}

//-------------------------------------------------------------------
// Following function sends sensor data to thingspeak.com
//-------------------------------------------------------------------
void updateTemp(String voltage1,String voltage2,String voltage3,String voltage4)
{  
  String cmd = "AT+CIPSTART=\"TCP\",\"";
  cmd += IP;
  cmd += "\",80";
  esp8266Module.println(cmd);
  delay(5000);
  if(esp8266Module.find("Error")){
    if(DEBUG){
      Serial.println("ERROR while SENDING");
    }  
    return;
  }
  cmd = GET + "&field1=" + voltage1 + "&field2=" + voltage2 + "&field3=" + voltage3 + "&field4=" + voltage4 + "\r\n";
  esp8266Module.print("AT+CIPSEND=");
  esp8266Module.println(cmd.length());
  delay(15000);
  if(esp8266Module.find(">"))
  {
    esp8266Module.print(cmd);
    if(DEBUG){
      Serial.println("Data sent");
    }
  }else
  {
    esp8266Module.println("AT+CIPCLOSE");
    if(DEBUG){
      Serial.println("Connection closed");
    }  
  }
}

Library and code for Personal Weather Station

Check out Readme

Credits

Jayraj Desai

Jayraj Desai

10 projects • 61 followers
Just a Hobbyist, trying things

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