Smart Motion Alert System (ESP32)

Concept

A basic motion detection system using an ESP32 and PIR sensor that sends alerts (LED + optional buzzer / serial message). It demonstrates real-world security application, which aligns well with your Element14 challenge theme.

💻 Code (Arduino IDE)

#define PIR_PIN 13
#define LED_PIN 2
#define BUZZER_PIN 4

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  Serial.begin(115200);
}

void loop() {
  int motion = digitalRead(PIR_PIN);

  if (motion == HIGH) {
    Serial.println("Motion Detected!");
    digitalWrite(LED_PIN, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);
    delay(1000);
  } else {
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
  }
}

How It Works

• PIR detects infrared changes → motion detected
• ESP32 processes signal
• LED + buzzer alert instantly
• Serial monitor logs activity