View source for Weatherstation/Weather Station March 2023


Features / improvements

# MDNS for discovery of web service.
# Moved Secrets to include file.
# removed serial requirement, so it can run "headless"
# moved from esp12 hardware to esp32 hardware. - note less elegant web code, not handler based.
# Dsiabled neopin lighting.

<pre>
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include "Adafruit_BME680.h"
#include <WiFi.h>
#include <ESPmDNS.h>

#include "wifi_secrets.h"

#define HOSTNAME "weatherstation3"

char ssid[]     = SECRET_SSID;
char password[] = SECRET_PASS;


#define SEALEVELPRESSURE_HPA (1013.25)
#define I2C_SDA 0
#define I2C_SCL 1

WiFiServer server(80);

// Variable to store the HTTP request
String header;

Adafruit_BME680 bme;
unsigned long currentTime;
unsigned long previousTime;
const long timeoutTime = 2000;

void handleMetrics( WiFiClient client) {
  // digitalWrite(LED_BUILTIN, HIGH);
  Serial.print("request: metrics");

  // delay(1000);                       // wait for a second
  Serial.print("bme.performReading()");
  if (! bme.performReading()) {
    Serial.println("Failed to perform reading.");
    // server.send(200, "text/plain", "Failed to perform reading.");
    return;
  }
  Serial.println("Reading done, sending....");
  // # HELP temperature Temperature in Celcius"
  // # TYPE temperature guage")
  String message = "temperature{instance=\"";
  message += HOSTNAME;
  message += "\"} ";
  message += bme.temperature;
  message += "\n";
  
  // Serial.println("# HELP barometric_pressure in hectopascals (hPa)"
  // Serial.println("# TYPE barometric_pressure guage")
  message += "barometric_pressure{instance=\"";
  message += HOSTNAME;
  message += "\"} ";
  message += (bme.pressure / 100.0);
  message += "\n";

  // Serial.println("# HELP humidity relative humidity percent (%)"
  // Serial.println("# TYPE humidity guage")
  message += "humidity{instance=\"";
  message += HOSTNAME;
  message += "\"} ";
  message += bme.humidity;
  message += "\n";

  // Serial.println("# HELP gas_resistance Gas Resistance in  KOhms"
  // Serial.println("# TYPE gas_resistance guage")
  message += "gas_resistance{instance=\"";
  message += HOSTNAME;
  message += "\"} ";
  message += (bme.gas_resistance / 1000.0);
  message += "\n";

  // Serial.println("# HELP approximate_altitude in meters KOhms"
  // Serial.println("# TYPE approximate_altitude guage")
  message += "approximate_altitude{instance=\"";
  message += HOSTNAME;
  message += "\"} ";
  message += bme.readAltitude(SEALEVELPRESSURE_HPA);
  // message += "\n";
  Serial.println(message);
  client.print(message);
  // server.send(200, "text/plain", message);
}

void handleNotFound() {
  Serial.println("handleNotFound: not found");
  // server.send(404, "text/plain", "Not found");
}

// the setup function runs once when you press reset or power the board
void setup() {
  Wire.setPins(I2C_SDA, I2C_SCL);
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);
  Serial.begin(9600);
  // while (!Serial);
  
  Serial.println(F("begin wifi"));
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.println(F("wifi begined, wait for connected"));
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println(F("connected"));
  
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  if (!MDNS.begin(HOSTNAME)) {
    Serial.println("Error setting up MDNS responder!");
    while(1){
      delay(1000);
    }
  }

  Serial.println(F("BME680 begin"));
  if (!bme.begin()) {
    Serial.println("Could not find a valid BME680 sensor, check wiring!");
    while (1);
  }

  Serial.println("setting over sampling");
  bme.setTemperatureOversampling(BME680_OS_8X);
  bme.setHumidityOversampling(BME680_OS_2X);
  bme.setPressureOversampling(BME680_OS_4X);
  bme.setIIRFilterSize(BME680_FILTER_SIZE_3);
  bme.setGasHeater(320, 150);
  Serial.println("set over sampling");

  Serial.println("web server begin");
  server.begin();
  Serial.println("HTTP server started");
  MDNS.addService("http", "tcp", 80);
}

void loop() {
  WiFiClient client = server.available();

  if (client) {                             // If a new client connects,
    currentTime = millis();
    previousTime = currentTime;
    Serial.println("C");          // print a message out in the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected() && currentTime - previousTime <= timeoutTime) {  // loop while the client's connected
      currentTime = millis();
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        // Serial.write(c);                    // print it out the serial monitor
        header += c;
        if (c == '\n') {                    // if the byte is a newline character
          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();
            
            if (header.indexOf("GET /metrics") >= 0) {
              handleMetrics(client);
              //stuff
            } else {
              Serial.println("UNRECOGNIZED CALL");
            }
            
            // client.println("<p>GPIO 27 - State " + output27State + "</p>");
            break;
          } else { // if you got a newline, then clear currentLine
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }
    }
  }
  // Clear the header variable
  header = "";
  // Close the connection
  client.stop();
  Serial.println("Client disconnected.");
  Serial.println("");
  }
}
/*
  Serial.println("loop start");
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
*/

  //server.handleClient();
  // MDNS.update();
</pre>

<hr>

wifi_secrets.h would look something like this:

<pre>
#define SECRET_SSID "FBI Van"
#define SECRET_PASS "candyisfree"
</pre>

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