ESP8266 vote meter example with JSON

gistfile1.txt

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>

// WiFi network parameters
const char* ssid = "<your SSID>";
const char* password = "<your passphrase>";

void setup() {
  pinMode(1, OUTPUT);
  //Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
  }

}

void parsePayload(String payload) {
  DynamicJsonBuffer jsonbuffer;
  JsonObject& root = jsonbuffer.parseObject(payload);

  if (root.success()) {
    String dElectoral = root["dElectoral"];
    String rElectoral = root["rElectoral"];

    float D = dElectoral.toInt();
    float R = rElectoral.toInt();
    float T = D + R;

    float ratio = 0.5;
    if (T != 0) ratio = R/T;

    int meterValue = 1023 * ratio;
    analogWrite(1, meterValue);
  }
  
}

void loop() {

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

    HTTPClient http;
    http.begin("http://35.162.231.64/election2016.json");

    int httpCode = http.GET();

    if (httpCode > 0) {
      if (httpCode == HTTP_CODE_OK) {
        String payload = http.getString();
        parsePayload(payload); 
      }
      
    }
    http.end();
  }

  delay(5000);
}