Description
The Mini Weather Station collects the datas related to the weather and environment using different sensors. In this project we are collecting the datas which are Temperature,Humidity,Atmospheric pressure,Light intensity,UV index and Dust concentration.The aim is to make a small and simple weather station, using open hardware. Okey, let's get start .
The Mini Weather Station collects the datas related to the weather and environment using different sensors. In this project we are collecting the datas which are Temperature,Humidity,Atmospheric pressure,Light intensity,UV index and Dust concentration.The aim is to make a small and simple weather station, using open hardware. Okey, let's get start .
Components Required
| 1. | Arduino UNO | * 1 |
| 2. | Grove Light Sensor | * 1 |
| 3. | Grove UV sensor | * 1 |
| 4. | Barometric Pressure Sensor (BMP085) | * 1 |
| 5. | DHT22 Sensor | * 1 |
| 6. | Grove Dust Sensor | * 1 |
| 7. | ESP8266 | * 1 |
| 8. | Protoshield with Bread Board | * 1 |
| 9. | 1K ohm Resistor | * 2 |
| 10. | 10K ohm Resistor | * 1 |
| 11. | 47K ohm Resistor | * 1 |
| 12. | Jumper Wires | * 1 |
Circuit Diagram
Program
#include <SoftwareSerial.h>
#include <DHT.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP085_U.h>
#define SSID "XXXXX" //replace XXXXX by your router SSID
#define PASS "YYYYY" //replace YYYYY by your router password
#define IP "184.106.153.149" // thingspeak.com IP
#define DHT22_PIN 2
String GET = "GET /update?key=ZZZZZ&field1="; //replace ZZZZZ by your ThingSpeak channel write key
SoftwareSerial monitor(10, 11); //Serial communication to ESP8266 module (RX, TX)
dht DHT;
Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10085);
//Variables
int luminancePin = A0;
int uvPin = A1;
int dustPin = 8;
unsigned long duration;
unsigned long starttime;
unsigned long sampletime_ms = 30000;
unsigned long delay_time = 60000;
unsigned long lowpulseoccupancy = 0;
float ratio = 0;
float concentration = 0;
//setup
void setup()
{
//start serial communications
Serial.begin(9600);
monitor.begin(9600);
Serial.println("Initializing...");
//configure Arduino pins
pinMode(dustPin, INPUT);
//initialize pressure sensor
Serial.println("Detecting BMP085 pressure sensor...");
if(!bmp.begin())
{
Serial.println("BMP085 sensor wasn't detected. Verify your connections or I2C ADDR!");
while(1);
}
Serial.println("BMP085 detected!");
//communication with wifi module
monitor.flush();
monitor.println("AT");
delay(2000);
if(monitor.find("OK")){
Serial.println("Communication with ESP8266 module: OK");
}
else {
Serial.println("ESP8266 module ERROR");
}
//connect wifi router
connectWiFi();
Serial.print("Sampling (");
Serial.print(sampletime_ms/1000);
Serial.println("s)...");
//initialize timer
starttime = millis();
}
void loop(){
//measuring dust particles
duration = pulseIn(dustPin, LOW);
lowpulseoccupancy = lowpulseoccupancy + duration;
//30 seconds cicle
if ((millis() - starttime) >= sampletime_ms)
{
ratio = lowpulseoccupancy/(sampletime_ms*10.0); // percentage (de 0 a 100%)
concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // from datsheet
lowpulseoccupancy = 0;
//read other sensors
char buffer[10];
//light sensor
float luminance = analogRead(luminancePin);
//UV sensor
float uv = analogRead(uvPin);
uv = uv * 0.0049; //convert values to volts
uv = uv * 307; //convert to mW/m²
uv = uv/200; //calculate UV index
//temperature and humidity
int chk = DHT.read22(DHT22_PIN);
float humidity = DHT.humidity;
float temperature = DHT.temperature;
//pressure and temperature1
sensors_event_t event;
bmp.getEvent(&event);
float pressure = 0;
float temperature1 = 0;
if (event.pressure)
{
pressure = event.pressure;
bmp.getTemperature(&temperature1);
}
//convert sensor values to strings
String luminanceStr = dtostrf(luminance, 4, 1, buffer);
luminanceStr.replace(" ","");
String uvStr = dtostrf(uv, 4, 1, buffer);
uvStr.replace(" ","");
String humidityStr = dtostrf(humidity, 4, 1, buffer);
humidityStr.replace(" ","");
String temperatureStr = dtostrf(temperature, 4, 1, buffer);
temperatureStr.replace(" ","");
String dustStr = dtostrf(concentration, 4, 1, buffer);
dustStr.replace(" ","");
String pressureStr = dtostrf(pressure, 4, 1, buffer);
pressureStr.replace(" ","");
String temperature1Str = dtostrf(temperature1, 4, 1, buffer);
temperature1Str.replace(" ","");
//send data to ThingSpeak
updateSensors(luminanceStr, humidityStr, temperatureStr, uvStr, dustStr, pressureStr, temperature1Str);
//wait next sampling cycle
Serial.print("Wait ");
Serial.print(delay_time/1000);
Serial.println("s for next sampling");
Serial.println();
delay(delay_time);
//initialize new cycle
Serial.println();
Serial.print("Sampling (");
Serial.print(sampletime_ms/1000);
Serial.println("s)...");
starttime = millis();
}
}
//Send data to ThingSpeak
void updateSensors(String luminanceStr, String humidityStr, String temperatureStr, String uvStr, String dustStr, String pressureStr, String temperature1Str) {
String cmd = "AT+CIPSTART=\"TCP\",\"";
cmd += IP;
cmd += "\",80";
monitor.println(cmd);
delay(2000);
cmd = GET;
cmd += luminanceStr;
cmd += "&field2=";
cmd += humidityStr;
cmd += "&field3=";
cmd += temperatureStr;
cmd += "&field4=";
cmd += uvStr;
cmd += "&field5=";
cmd += dustStr;
cmd += "&field6=";
cmd += pressureStr;
cmd += "&field7=";
cmd += temperature1Str;
cmd += "\r\n";
delay(1000);
int strsize = cmd.length();
monitor.println("AT+CIPSEND=" + String(strsize));
delay(2000);
monitor.print(cmd);
if(monitor.find("OK")){
Serial.println("Transmission completed with success");
}else{
Serial.println("Transmission failed!");
}
}
void sendDebug(String cmd){
Serial.print("SEND: ");
Serial.println(cmd);
monitor.println(cmd);
}
boolean connectWiFi(){
Serial.println("Connecting wi-fi...");
String cmd ="AT+CWMODE=1";
monitor.println(cmd);
delay(2000);
monitor.flush(); //clear buffer
cmd="AT+CWJAP=\"";
cmd+=SSID;
cmd+="\",\"";
cmd+=PASS;
cmd+="\"";
monitor.println(cmd);
delay(5000);
if(monitor.find("OK")){
Serial.println("Connection succeeded!");
return true;
}else{
Serial.println("Connection failed!");
return false;
}
Serial.println();
}