Wiki

#include <WiFi.h>
#include <WebServer.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <Thread.h>
 
const char *ssid = ".....";
const char *password = ".....";
 
float btc;
 
Thread myThread = Thread();
 
void getBtcFromKraken() {
 
  HTTPClient http;
 
  http.begin("https://api.kraken.com/0/public/Ticker?pair=XXBTZEUR");
 
  int httpCode = http.GET();
 
  if (httpCode == HTTP_CODE_OK) {
    String response = http.getString();
 
    JsonDocument doc;
    DeserializationError error = deserializeJson(doc, response);
    if (!error) {
      btc = doc["result"]["XXBTZEUR"]["c"][0].as<float>();
      Serial.print("BTC: ");
      Serial.println(btc);
    }
 
  }
 
  http.end();
}
 
 
WebServer server(80);
 
 
 
void handleRoot() {
  String html = "BTC = " + String(btc);
  server.send(200, "text/plain", html);
}
 
void setup(void) {
  Serial.begin(115200);
 
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) delay(500);
 
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
 
  //if (MDNS.begin("esp32")) {
  //  Serial.println("MDNS responder started");
  //}
 
 
  myThread.onRun(getBtcFromKraken);
  myThread.setInterval(10000);
  myThread.run();
 
  server.on("/", handleRoot);
 
  server.onNotFound([]() {
    server.send(404, "text/plain", "Not Found");
  });
 
  server.begin();
  Serial.println("HTTP server started");
}
 
void loop(void) {
  if (myThread.shouldRun()) myThread.run();
  Serial.print(".");
  server.handleClient();
  delay(500);  //allow the cpu to switch to other tasks
}