#include <WiFi.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";

String apiKey = "IF7EG7BXEML5NYPH";
const char* server = "api.thingspeak.com";

WiFiClient client;

int ecgValue;

void setup() {
  Serial.begin(115200);

  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("\nWiFi Connected!");
}

void loop() {

  // Generate fluctuating ECG-like values
  ecgValue = random(600, 900);

  Serial.print("ECG Value: ");
  Serial.println(ecgValue);

  if (client.connect(server, 80)) {

    String url = "/update?api_key=" + apiKey + "&field1=" + String(ecgValue);

    client.print(String("GET ") + url + " HTTP/1.1\r\n" +
                 "Host: api.thingspeak.com\r\n" +
                 "Connection: close\r\n\r\n");

    Serial.println("Data sent to ThingSpeak");
  }

  client.stop();

  delay(60000);   // 1 minute delay
}