weather station

weather.ino

#include <ArduinoJson.h>

#include <WiFi.h>

#include <FastLED.h>

#define NUM_BOARDS 1# define NUM_LEDS 64 * NUM_BOARDS

# define DATA_PIN 18# define CLOCK_PIN 5

CRGB matrix[NUM_LEDS];

CRGB rain_colour;
CRGB temp_colour;
CRGB blank_colour;
CRGB cloud_colour;

CRGB wind_colour;

// WiFi network name and password:
const char * networkName = "Redbrick";
const char * networkPswd = "100heads>1";

// Internet domain to request from:
const char * hostDomain = "api.openweathermap.org";
const int hostPort = 80;

const int BUTTON_PIN = 0;
const int LED_PIN = 5;

//String rain;

void setup() {

  // Initilize hardware:
  Serial.begin(115200);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);

  rain_colour[0] = 0;
  rain_colour[1] = 0;
  rain_colour[2] = 100;

  blank_colour[0] = 0;
  blank_colour[1] = 0;
  blank_colour[2] = 0;

  LEDS.addLeds < APA102, DATA_PIN, CLOCK_PIN, BGR > (matrix, NUM_LEDS);
  //LEDS.setBrightness(32);

  // Connect to the WiFi network (see function below loop)
  connectToWiFi(networkName, networkPswd);

  digitalWrite(LED_PIN, LOW); // LED off
  Serial.print("heap: ");
  Serial.println(ESP.getFreeHeap());
  Serial.print("Press button 0 to connect to ");
  Serial.println(hostDomain);
}

void loop() {
  requestURL(hostDomain, hostPort); // Connect to server
  delay(1000000);
}

void connectToWiFi(const char * ssid,
  const char * pwd) {
  int ledState = 0;

  printLine();
  Serial.println("Connecting to WiFi network: " + String(ssid));

  WiFi.begin(ssid, pwd);

  while (WiFi.status() != WL_CONNECTED) {
    // Blink LED while we're connecting:
    digitalWrite(LED_PIN, ledState);
    ledState = (ledState + 1) % 2; // Flip ledState
    delay(500);
    Serial.print(".");
  }

  Serial.println();
  Serial.println("WiFi connected!");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
}

void requestURL(const char * host, uint8_t port) {
  // printLine();
  Serial.println("Connecting to domain: " + String(host));

  // Use WiFiClient class to create TCP connections
  WiFiClient client;
  if (!client.connect(host, port)) {
    Serial.println("connection failed");
    return;
  }
  Serial.println("Connected!");
  printLine();

  Serial.print("heap: ");
  Serial.println(ESP.getFreeHeap());

  // This will send the request to the server
  client.print((String)
    "GET /data/2.5/forecast?q=bristol&appid=fb19be8ac48cdff616fbc7f54ff30a19 HTTP/1.1\r\n" +
    "Host: " + String(host) + "\r\n" +
    "Connection: close\r\n\r\n");
  unsigned long timeout = millis();
  while (client.available() == 0) {
    if (millis() - timeout > 5000) {
      Serial.println(">>> Client Timeout !");
      client.stop();
      return;
    }
  }

  Serial.print("heap: ");
  Serial.println(ESP.getFreeHeap());

  String line = "";
  while (client.available()) {
    Serial.print("heap: ");
    Serial.println(ESP.getFreeHeap());
    line = client.readStringUntil('\r');
    if (line.indexOf('{') >= 0) {
      Serial.println(line);
      Serial.println("parsingValues");

      //create a json buffer where to store the json data 
      Serial.print("heap before doc: ");
      Serial.println(ESP.getFreeHeap());
      DynamicJsonDocument json_doc(60000);
      Serial.print("heap before deserialization: ");
      Serial.println(ESP.getFreeHeap());
      DeserializationError json_error = deserializeJson(json_doc, line);
      Serial.print("heap: ");
      Serial.println(ESP.getFreeHeap());
      //   json_error = jsonBuffer.parseObject(line); 
      if (json_error) {
        Serial.println("parseing failed");
        Serial.println(json_error.c_str());

        //return; 
      } else {

        // Note -- we only want 16 items from the list of forecasts.

        for (int i = 0; i < 16; i++) {

          String rain = json_doc["list"][i]["rain"]["3h"];
          if (rain != "null") {

            rain_colour[2] = min(max(2, int(rain.toInt() * 10)), 255);
            if (i < 8) {
              matrix[56 + i] = rain_colour;
            } else {
              matrix[24 + (i - 8)] = rain_colour;
            }

          } else {

            if (i < 8) {
              matrix[56 + i] = blank_colour;
            } else {
              matrix[24 + (i - 8)] = blank_colour;
            }
          }
        }

        FastLED.show();

        //now let's get the temperature
        for (int i = 0; i < 16; i++) {
          String temp_str = json_doc["list"][i]["main"]["temp"];
          //note -- temp in kelvin, let's convert to celcius
          float temp = temp_str.toFloat() - 273.15;

          //frost!
          if (temp < 0) {
            temp_colour[0] = 10;
            temp_colour[1] = 10;
            temp_colour[2] = 10;
          } else {
            temp_colour[2] = max(40 - (temp * float(2.5)), float(0.0));
            temp_colour[0] = max((temp * 3) - 30, float(0.0));
          }

          if (i < 8) {
            matrix[48 + i] = temp_colour;
          } else {
            matrix[16 + (i - 8)] = temp_colour;
          }
        }

        //cloudiness -- percentage
        for (int i = 0; i < 16; i++) {
          String cloud_str = json_doc["list"][i]["clouds"]["all"];
          int cloud = cloud_str.toInt();
          cloud_colour[0] = 5;
          cloud_colour[1] = 5;
          cloud_colour[2] = cloud / 20;

          if (i < 8) {
            matrix[40 + i] = cloud_colour;
          } else {
            matrix[8 + (i - 8)] = cloud_colour;
          }
        }

        ///let's have wind as the last option

        for (int i = 0; i < 16; i++) {
          String wind_str = json_doc["list"][i]["wind"]["speed"];
          int wind = wind_str.toInt();
          wind_colour[0] = 0;
          wind_colour[1] = min(wind, 50);
          wind_colour[2] = 0;

          if (i < 8) {
            matrix[32 + i] = wind_colour;
          } else {
            matrix[i - 8] = wind_colour;
          }
        }

        FastLED.show();

      }
    }
  }
}

void printLine() {
  Serial.println();
  for (int i = 0; i < 30; i++)
    Serial.print("-");
  Serial.println();
}

void sun() {}

void cloud() {

}