Project Hub /Security Surveillance & Defense/Intrusion Detection Systems/Send SMS Alert Using Seeed Studio Xiao ESP32

Beginner

ESP32

₹500 – ₹1,500

3 – 6 Hours

Complete Kit

Send SMS Alert Using Seeed Studio Xiao ESP32

A compact IoT security project using a Seeed Studio XIAO ESP32-S3 and an HC-SR04 ultrasonic sensor to detect nearby movement and send real-time SMS alerts over Wi-Fi via a cloud API.

Originally published on CircuitDigest

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

ESP32-C3 Development Board with Berg Pins - Unsoldered Rs. 750.00
Ultrasonic Sensor Module HC-SR04 Rs. 139.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

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How It Works

The system operates by combining distance measurement with cloud connectivity to monitor physical spaces for unauthorized presence. At the heart of the setup is the HC-SR04 ultrasonic sensor, which measures distance by emitting a high-frequency sound wave and calculating the time it takes for the echo to return after bouncing off an object. This sensor is wired to the Seeed Studio XIAO ESP32-S3 microcontroller on a breadboard using jumper wires. The microcontroller continuously polls the sensor to determine if an object moves within a predefined threshold distance, indicating a potential intrusion. When a target is detected within this range, the ESP32-S3 utilizes its built-in Wi-Fi capabilities to connect to a local wireless network. Once connected, the microcontroller communicates with a cloud API over the internet to trigger and send a real-time SMS notification to the user's mobile device, alerting them to the movement.

Why Build This

Gain practical experience deploying IoT perimeter monitoring and home security systems for real-world intrusion detection.

Learn how to integrate microcontrollers with cloud APIs over Wi-Fi to automate remote notifications and alerts.

Real-World Application

Home security intrusion detection, perimeter monitoring, automated proximity alerts, and smoke/fire notification systems.

Skills You'll Learn

Ultrasonic distance sensing

GPIO interfacing

Wi-Fi network configuration

cloud API integration

microcontroller firmware programming

Safety Precautions

No specific precautions noted for this build — always follow general electronics safety practices.

Technology Tags

ESP32-S3

HC-SR04

ULTRASONIC SENSOR

WI-FI

CLOUD API

HTTP POST

ARDUINO IDE

IOT

SENSORS

Frequently Asked Questions

What power source do I need for the Seeed Studio XIAO ESP32-S3?

The microcontroller is typically powered via its USB-C connection connected to a computer or a standard 5V USB power adapter.

Can I use any Wi-Fi network for this project?

Yes, as long as you have the correct SSID and password, and the network operates on the 2.4GHz band supported by the ESP32-S3.

Do I need a paid subscription to send SMS alerts?

It depends on the cloud API service you choose to interface with, as many providers offer free tiers suitable for low-volume personal projects.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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