main.cpp

#include <Arduino.h>
#include <ESP8266WiFi.h>

#define WIFI_SSID "bar"
#define WIFI_PSK "changeme"
#define IFTTT_WEBHOOK_URL "https://maker.ifttt.com/trigger/YOUR EVENT NAME HERE/with/key/YOUR KEY HERE"
#define IFTTT_WEBHOOK_HOST "maker.ifttt.com"
#define IFTTT_WEBHOOK_PORT 80
#define HTTP_TIMEOUT 5 // 5 seconds

#define PIR_PIN D7
#define SERIAL_BAUD 115200

#define POLLING_INTERVAL 30000 // 30 seconds

bool currentState = false;
WiFiClient client;

void notify() {
  client.connect(IFTTT_WEBHOOK_HOST, IFTTT_WEBHOOK_PORT);
  client.print(String("GET ") + IFTTT_WEBHOOK_URL + 
                      " HTTP/1.1\r\n" +
                      "Host: " + IFTTT_WEBHOOK_HOST + "\r\n" + 
                      "Connection: close\r\n\r\n");
  client.stop();
}

void setup() {
  Serial.begin(SERIAL_BAUD);
  while (!Serial) {
    delay(10);
  }

  pinMode(PIR_PIN, INPUT);

  WiFi.begin(WIFI_SSID, WIFI_PSK);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }

  Serial.println(F("Connected!"));
}

void loop() {
  long state = digitalRead(PIR_PIN);

  if (state == HIGH && !currentState) {
    currentState = true;
    Serial.println(F("Motion detected!"));
    notify();
  } else if (state == LOW && currentState) {
    currentState = false;
    Serial.println(F("Motion stopped!"));
  }

  delay(POLLING_INTERVAL);
}