E10. HTTP Client, JSON and Cloud APIs

#include <WiFi.h>                         // the Wi-Fi commands
#include <HTTPClient.h>                   // the commands for asking websites

String ssid = "YOUR_WIFI_SSID";           // your Wi-Fi network name
String password = "YOUR_WIFI_PASSWORD";   // your Wi-Fi password

// the question: current temperature at latitude 51.5, longitude -0.12 (London)
String url = "http://api.open-meteo.com/v1/forecast?latitude=51.5&longitude=-0.12&current=temperature_2m";

void setup() {                            // runs once
  Serial.begin(115200);                   // start Serial at the ESP32 speed

  WiFi.begin(ssid, password);             // start joining the network
  Serial.print("Connecting");             // tell the user we are trying
  while (WiFi.status() != WL_CONNECTED) { // repeat until we have joined
    delay(500);                           // wait half a second
    Serial.print(".");                    // print a dot each time
  }
  Serial.println(" connected");           // we are on the network

  HTTPClient http;                        // something that can ask websites
  http.begin(url);                        // the address to ask
  int code = http.GET();                  // ask, and keep the status code
  Serial.print("Status code: ");          // a label
  Serial.println(code);                   // 200 means OK
  Serial.println(http.getString());       // print the whole reply
  http.end();                             // finished with this request
}

void loop() {                             // nothing to repeat in this sketch
}

#include <WiFi.h>                         // the Wi-Fi commands
#include <HTTPClient.h>                   // the commands for asking websites
#include <ArduinoJson.h>                  // the commands for reading JSON

String ssid = "YOUR_WIFI_SSID";           // your Wi-Fi network name
String password = "YOUR_WIFI_PASSWORD";   // your Wi-Fi password

// the question: current temperature at latitude 51.5, longitude -0.12 (London)
String url = "http://api.open-meteo.com/v1/forecast?latitude=51.5&longitude=-0.12&current=temperature_2m";

void setup() {                            // runs once
  Serial.begin(115200);                   // start Serial at the ESP32 speed

  WiFi.begin(ssid, password);             // start joining the network
  Serial.print("Connecting");             // tell the user we are trying
  while (WiFi.status() != WL_CONNECTED) { // repeat until we have joined
    delay(500);                           // wait half a second
    Serial.print(".");                    // print a dot each time
  }
  Serial.println(" connected");           // we are on the network

  HTTPClient http;                        // something that can ask websites
  http.begin(url);                        // the address to ask
  int code = http.GET();                  // ask, and keep the status code

  if (code == 200) {                      // only read the reply if it is OK
    JsonDocument doc;                     // a place to keep the decoded JSON
    deserializeJson(doc, http.getString()); // decode the reply into doc
    float temperature = doc["current"]["temperature_2m"]; // find the number
    Serial.print("Temperature: ");        // a label
    Serial.print(temperature);            // the number, e.g. 14.20
    Serial.println(" C");                 // the unit
  } else {                                // anything else went wrong
    Serial.print("Request failed, code "); // say so
    Serial.println(code);                 // and show the code
  }

  http.end();                             // finished with this request
}

void loop() {                             // nothing to repeat in this sketch
}