Compute the world's state with sentiment analysis

stateOfTheWorld.ino

//Libraries
#include <ArduinoJson.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <Adafruit_NeoPixel.h>

//Pin for the NeoPixel
int ledPin = 14;

//Initiate NeoPixel
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(12, ledPin, NEO_GRB + NEO_KHZ800);

//Colors
int minus5[] = {255, 0, 0};
int minus4[] = {255, 51, 0};
int minus3[] = {255, 102, 0};
int minus2[] = {255, 153, 0};
int minus1[] = {255, 204, 0};
int neutral[] = {255, 255, 0};
int plus1[] = {204, 255, 0};
int plus2[] = {153, 255, 0};
int plus3[] = {102, 255, 0};
int plus4[] = {51, 255, 0};
int plus5[] = {0, 255, 0};


// WiFi Credentials
const char* ssid = "WiFi SSID";
const char* password =  "PASSWORD";

String article;
int sentiment = 0;

void getSentiment() {

  HTTPClient http;

  http.begin("http://api.meaningcloud.com/sentiment-2.1?key=<<API-KEY>>&of=json&txt=" + article + "&lang=en");

  int httpCode = http.GET();

  if (httpCode == 200) {

    String payload = http.getString();

    const size_t capacity = 2*JSON_ARRAY_SIZE(0) + 7*JSON_ARRAY_SIZE(1) + 5*JSON_ARRAY_SIZE(2) + 2*JSON_ARRAY_SIZE(3) + JSON_ARRAY_SIZE(4) + 2*JSON_ARRAY_SIZE(5) + 2*JSON_ARRAY_SIZE(6) + JSON_ARRAY_SIZE(7) + 25*JSON_OBJECT_SIZE(4) + 4*JSON_OBJECT_SIZE(6) + 22*JSON_OBJECT_SIZE(7) + JSON_OBJECT_SIZE(8) + 2*JSON_OBJECT_SIZE(9) + 3*JSON_OBJECT_SIZE(10) + JSON_OBJECT_SIZE(11) + 3500;

    DynamicJsonDocument doc(capacity);

    DeserializationError error = deserializeJson(doc, payload, DeserializationOption::NestingLimit(11));

    if (error) {
      Serial.print(F("deserializeJson() Error: "));
      Serial.println(error.c_str());
      return;
    }

    JsonObject status = doc["status"];
    String score_tag = doc["score_tag"];

    Serial.println(score_tag);

    if (score_tag == "P+") {
      sentiment += 2;
    }
    else if (score_tag == "P") {
      sentiment += 1;
    }
    else if (score_tag == "N") {
      sentiment -= 1;
    }
    else if (score_tag == "N+") {
      sentiment -= 2;
    }
    else if (score_tag == "NONE") {
      sentiment += 0;
    }
  }

  else {
    Serial.println("Bad HTTP Request");
  }
  http.end();
}

void setup() {
  pixels.begin();
  pixels.setBrightness(175);

  pinMode (14, OUTPUT); //LED Pin


  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting...");
  }
  Serial.println("Connected!");
}

void () {

  //reset sentiment count
  sentiment = 0;

  if ((WiFi.status() == WL_CONNECTED)) {

    HTTPClient http;

    http.begin("http://newsapi.org/v2/top-headlines?country=us&apiKey=<<API-KEY>>");

    int httpCode = http.GET();

    if (httpCode == 200) {

      String payload = http.getString();

      const size_t capacity = JSON_ARRAY_SIZE(20) + 20 * JSON_OBJECT_SIZE(2) + JSON_OBJECT_SIZE(3) + 20 * JSON_OBJECT_SIZE(8) + 16600;
      DynamicJsonDocument doc(capacity);

      DeserializationError error = deserializeJson(doc, payload);

      if (error) {
        Serial.print(F("deserializeJson() Error: "));
        Serial.println(error.c_str());
        return;
      }

      //Save number of headlines
      int noHeadlines = doc["totalResults"];

      //Loop through headlines & get sentiment
      for (int i = 0; i < 15; i++) {

        //Get Headlines from Newsapi
        JsonArray articles = doc["articles"];

        JsonObject articles_number = articles[i];

        const char* articles_number_title = articles_number["title"];

        article = String(articles_number_title);
        Serial.println(article);
        
        article.replace(" ", "%20");
        Serial.println(article);

        getSentiment();
      }
      
      Serial.println("Loop done.");
      Serial.println(sentiment);

      //Show state on NeoPixel
      if (sentiment <= -5) {
        for (int i = 0; i < 12; i++) {
          pixels.setPixelColor(i, minus5[0], minus5[1], minus5[2]);
          pixels.show();
        }
      } else if (sentiment >= 5) {
        for (int i = 0; i < 12; i++) {
          pixels.setPixelColor(i, plus5[0], plus5[1], plus5[2]);
          pixels.show();
        }
      }

      switch (sentiment) {
        case -4:
          for (int i = 0; i < 12; i++) {
            pixels.setPixelColor(i, minus4[0], minus4[1], minus4[2]);
            pixels.show();
          }
          break;
        case -3:
          for (int i = 0; i < 12; i++) {
            pixels.setPixelColor(i, minus3[0], minus3[1], minus3[2]);
            pixels.show();
          }
          break;
        case -2:
          for (int i = 0; i < 12; i++) {
            pixels.setPixelColor(i, minus2[0], minus2[1], minus2[2]);
            pixels.show();
          }
          break;
        case -1:
          for (int i = 0; i < 12; i++) {
            pixels.setPixelColor(i, minus1[0], minus1[1], minus1[2]);
            pixels.show();
          }
          break;
        case 0:
          for (int i = 0; i < 12; i++) {
            pixels.setPixelColor(i, neutral[0], neutral[1], neutral[2]);
            pixels.show();
          }
          break;
        case 1:
          for (int i = 0; i < 12; i++) {
            pixels.setPixelColor(i, plus1[0], plus1[1], plus1[2]);
            pixels.show();
          }
          break;
        case 2:
          for (int i = 0; i < 12; i++) {
            pixels.setPixelColor(i, plus2[0], plus2[1], plus2[2]);
            pixels.show();
          }
          break;
        case 3:
          for (int i = 0; i < 12; i++) {
            pixels.setPixelColor(i, plus3[0], plus3[1], plus3[2]);
            pixels.show();
          }
          break;
        case 4:
          for (int i = 0; i < 12; i++) {
            pixels.setPixelColor(i, plus4[0], plus4[1], plus4[2]);
            pixels.show();
          }
          break;
      }
    }

    else {
      Serial.println("Bad HTTP Request");
    }

    http.end();
    Serial.println("Connection closed.");
  }
  //Wait for 30 minutes until next call
  delay(1800000);
}