#include <WiFi.h>
#include <PubSubClient.h>
#define PIR_PIN 14
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "broker.hivemq.com";
WiFiClient espClient;
PubSubClient client(espClient);
int lastState = LOW;
void setup() {
Serial.begin(115200);
pinMode(PIR_PIN, INPUT);
Serial.println("Connecting WiFi...");
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("\nWiFi connected");
client.setServer(mqtt_server, 1883);
}
void reconnect() {
while (!client.connected()) {
Serial.print("Connecting MQTT...");
if (client.connect("esp32_in")) {
Serial.println("OK");
} else {
Serial.println("Fail");
delay(1000);
}
}
}
void loop() {
if (!client.connected()) reconnect();
client.loop();
int val = digitalRead(PIR_PIN);
if (val == HIGH && lastState == LOW) {
Serial.println("IN detected");
client.publish("gate/in", "1");
delay(1000);
}
lastState = val;
delay(100);
}