Build a PIR Motion SMS Alarm with Arduino & SIM800L – GSM AT Commands Project

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Imagine a security system that instantly texts your phone the moment motion is detected. This project is exactly that: a standalone alarm that uses a PIR sensor to spot movement, triggers a buzzer and flashing LEDs on-site, and simultaneously sends an SMS alert through the SIM800L GSM module. It's a hands-on way to learn GSM communication, AT commands, and reliable sensor-driven automation—skills directly relevant to IoT security and industrial monitoring.

What You'll Build

You'll assemble a motion-triggered SMS alarm on a breadboard. When the PIR sensor detects human motion, the system blares a loud buzzer, lights up red LEDs, and sends a customizable text message to a pre-set phone number. The alarm then auto-resets, ready to catch the next intrusion. It's a complete, self-contained security device you can replicate for dorm rooms, workshops, or school projects.

What You'll Learn

• Interfacing a PIR sensor with Arduino to detect human movement accurately
• Sending and receiving SMS by programming AT commands for the SIM800L GSM module
• Managing multiple outputs—buzzer and LEDs—synchronized with motion events
• Designing a stable power supply for a power-hungry GSM module using a buck converter and decoupling capacitors

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This intermediate-level kit fits CBSE Class 11–12 students building electronics projects for board practicals, B.Tech ECE and EEE learners diving into IoT communication, and ATL Tinkering Lab innovators prototyping a real-world security gadget. It's also ideal for Smart India Hackathon participants and college makers from IITs, NITs, VIT, or BITS who need a reliable GSM-based surveillance solution with full code access.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.