nante
Published © GPL3+

IOT Weather station

This project measures the temperature, humidity, atmosferic pressure (and much more... ) and display then on a web page.

AdvancedFull instructions provided222
IOT Weather station

Things used in this project

Hardware components

SparkFun Atmospheric Sensor Breakout - BME280
SparkFun Atmospheric Sensor Breakout - BME280
×1
Monochrome 0.91”128x32 I2C OLED Display with Chip Pad
DFRobot Monochrome 0.91”128x32 I2C OLED Display with Chip Pad
×1
5 mm LED: Red
5 mm LED: Red
×1
Pushbutton Switch, Momentary
Pushbutton Switch, Momentary
×1
Through Hole Resistor, 56 ohm
Through Hole Resistor, 56 ohm
×1
Breadboard (generic)
Breadboard (generic)
×1
Jumper wires (generic)
Jumper wires (generic)
×1
Arduino Nano 33 IoT
Arduino Nano 33 IoT
×1

Software apps and online services

Arduino IDE
Arduino IDE

Story

Read more

Schematics

Weather station sketch

Code

Weather station software

C/C++
#include <Wire.h>
#include <WiFiNINA.h>
#include <EnvironmentCalculations.h>
#include <BME280I2C.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels
#define SCREEN_ADDRESS 0x3C
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)

#define SECRET_SSID "YOUR SSID"   //Your SSID
#define SECRET_PASS "YOUR PASSWORD"  //Your password

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID;        // your network SSID (name)
char pass[] = SECRET_PASS;    // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0;  // your network key index number (needed only for WEP)
float referencePressure = 1018.6;  // hPa local QFF (official meteor-station reading)
float outdoorTemp = 4.7;           // C  measured local outdoor temp.
float barometerAltitude = 1650.3;  // meters ... map readings + barometer position
BME280I2C::Settings settings(
   BME280::OSR_X1,
   BME280::OSR_X1,
   BME280::OSR_X1,
   BME280::Mode_Forced,
   BME280::StandbyTime_1000ms,
   BME280::Filter_16,
   BME280::SpiEnable_False,
   BME280I2C::I2CAddr_0x76
);

BME280I2C bme(settings);

int status = WL_IDLE_STATUS;

WiFiServer server(80);

void setup() {
   Serial.begin(9600);
   
   pinMode(LED_BUILTIN, OUTPUT);

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) { // Address 0x3C for 128x32
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  display.display();// Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  display.clearDisplay();  // Clear the buffer

  String fv = WiFi.firmwareVersion();
  if (fv < WIFI_FIRMWARE_LATEST_VERSION) {
    Serial.println("Please upgrade the firmware");
  }

  // attempt to connect to WiFi network:
  while (status != WL_CONNECTED) {

    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
    status = WiFi.begin(ssid, pass);
  }
    if(status = WL_CONNECTED){
      digitalWrite(LED_BUILTIN, HIGH);
       display.setTextSize(1);             // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE);        // Draw white text
  display.setCursor(0,0);
      display.println("connected!");
      display.display();
    }
    else{
    }
  
  server.begin();
  printWifiStatus();  // you're connected now, so print out the status:

   Wire.begin();

  while(!bme.begin())
  {
    Serial.print("Could not find BME280 sensor!");
    delay(100);
  }

  switch(bme.chipModel())
  {
     case BME280::ChipModel_BME280:
       Serial.println("Found BME280 sensor! Success.");
       break;
     case BME280::ChipModel_BMP280:
       Serial.println("Found BMP280 sensor! No Humidity available.");
       break;
     default:
       Serial.println("Found UNKNOWN sensor! Error!");
  }
}

void loop() {
  
  float temp(NAN), hum(NAN), pres(NAN);

   BME280::TempUnit tempUnit(BME280::TempUnit_Celsius);
   BME280::PresUnit presUnit(BME280::PresUnit_hPa);
   
  WiFiClient client = server.available();
  if (client) {
    Serial.println("new client");
    boolean currentLineIsBlank = true;// an HTTP request ends with a blank line
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial.write(c);
        // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the HTTP request has ended,
        // so you can send a reply
        if (c == '\n' && currentLineIsBlank) {
          // send a standard HTTP response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connection: close");  // the connection will be closed after completion of the response
          client.println("Refresh: 5");  // refresh the page automatically every 5 sec
          client.println();
          client.println("<!DOCTYPE HTML>");
          client.println("<html>");
          client.println("<head>");
          client.print("<title>WEATHER STATION</title>");// Your title on the tab
          client.println("</head>");
          client.print("<body>");
          client.print("<h1><center>WEATHER STATION</center></h1>");//Your title
          client.print("</body>");
          client.print("</html>");

bme.read(pres, temp, hum, tempUnit, presUnit);
   client.print("<center>");
   client.print("<h2><p>Temp: ");
   client.print(temp);
   client.print("&#176"+ String(tempUnit == BME280::TempUnit_Celsius ? "C" :"F"));
   client.println("<br />");
   client.print("\t\tHumidity: ");
   client.print(hum);
   client.print("% RH");
   client.println("<br />");
   client.print("\t\tPressure: ");
   client.print(pres);
   client.print(String(presUnit == BME280::PresUnit_hPa ? "hPa" : "Pa")); // expected hPa and Pa only
   client.println("<br />");
   EnvironmentCalculations::AltitudeUnit envAltUnit  =  EnvironmentCalculations::AltitudeUnit_Meters;
   EnvironmentCalculations::TempUnit     envTempUnit =  EnvironmentCalculations::TempUnit_Celsius;

   /// To get correct local altitude/height (QNE) the reference Pressure
   ///    should be taken from meteorologic messages (QNH or QFF)
   float altitude = EnvironmentCalculations::Altitude(pres, envAltUnit, referencePressure, outdoorTemp, envTempUnit);

   float dewPoint = EnvironmentCalculations::DewPoint(temp, hum, envTempUnit);

   /// To get correct seaLevel pressure (QNH, QFF)
   ///    the altitude value should be independent on measured pressure.
   /// It is necessary to use fixed altitude point e.g. the altitude of barometer read in a map
   float seaLevel = EnvironmentCalculations::EquivalentSeaLevelPressure(barometerAltitude, temp, pres, envAltUnit, envTempUnit);

   float absHum = EnvironmentCalculations::AbsoluteHumidity(temp, hum, envTempUnit);

   client.print("\t\tAltitude: ");
   client.print(altitude);
   client.print((envAltUnit == EnvironmentCalculations::AltitudeUnit_Meters ? "m" : "ft"));
   client.println("<br />");
   client.print("\t\tDew point: ");
   client.print(dewPoint);
   client.print("&#176"+ String(envTempUnit == EnvironmentCalculations::TempUnit_Celsius ? "C" :"F"));
   client.println("<br />");
   client.print("\t\tEquivalent Sea Level Pressure: ");
   client.print(seaLevel);
   client.print(String( presUnit == BME280::PresUnit_hPa ? "hPa" :"Pa")); // expected hPa and Pa only
   client.println("<br />");

   client.print("\t\tHeat Index: ");
   float heatIndex = EnvironmentCalculations::HeatIndex(temp, hum, envTempUnit);
   client.print(heatIndex);
   client.print("&#176"+ String(envTempUnit == EnvironmentCalculations::TempUnit_Celsius ? "C" :"F"));
   client.println("<br />");
   client.print("\t\tAbsolute Humidity: ");
   client.println(absHum);
   client.print("%");
             
          client.println("<br />");
          client.println("</html>");
          client.print("<style>body{background-color: White ;}");// You can choose your backround-color
          break;
        }
        if (c == '\n') {
          // you're starting a new line
          currentLineIsBlank = true;
        } else if (c != '\r') {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }
    // give the web browser time to receive the data
    delay(1);
    // close the connection:
    client.stop();
    Serial.println("client disconnected");
  }
}

void printWifiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your board's IP address:
  IPAddress ip = WiFi.localIP();
  display.setTextSize(1);             // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE);        // Draw white text
  display.setCursor(0,10);
  display.print("IP Address: \n");
  display.println(ip);
  display.display();
  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

Credits

nante

nante

0 projects • 0 followers

Comments

Add projectSign up / Login