Office Occupancy Tracker Kit with ESP32
Office Occupancy Tracker Kit with ESP32 — Instant SMS Alerts for Intrusion and Gas Leaks
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 securing your office against after-hours intrusion or a dangerous gas buildup without needing a complex alarm system. This kit guides you to build a compact device that combines a PIR motion sensor and an external gas sensor input (sold separately) with an ESP32 and SIM800L GSM module to send immediate SMS warnings to your phone. Whether you're a student exploring IoT or a hobbyist, you'll learn practical skills while constructing a real-world safety tool.
What You'll Build
You’ll assemble and program an ESP32-based alert system on a breadboard. When the HC-SR501 PIR sensor detects motion in a restricted area, or when a compatible gas sensor (like MQ-2) connected to the designated pin crosses a threshold, the SIM800L module instantly transmits a custom SMS message to a predefined number. The board runs on a stable 4V supply via an LM2596 buck converter, ensuring reliable GSM operation. By the end, you’ll have a functional prototype that you can deploy in a small office or lab.
What You'll Learn
- Wiring and power management for high-current GSM modules using a buck converter
- Interfacing a PIR sensor with an ESP32 and triggering events on motion detection
- Sending SMS messages via AT commands through the SIM800L module
- Setting up analog threshold monitoring for an external sensor (such as MQ-2) and integrating it into alert logic
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| SIM800L GSM Module | 1 |
| HC-SR501 PIR Sensor | 1 |
| LM2596 Buck Converter | 1 |
| 1000µF 25V Capacitor | 2 |
| 10kΩ Resistor | 5 |
| 100nF Capacitor | 5 |
| 400-pt Breadboard | 1 |
| Male-to-Male Jumper Wires | 20 |
| Micro USB Cable | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
Ideal for CBSE Class 11-12 students exploring embedded systems, B.Tech ECE/EEE undergraduates working on IoT projects, or participants in Smart India Hackathon building safety prototypes. Also suited for ATL Tinkering Labs and hobbyists preparing for first GSM-based alert systems.
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.
What if I get stuck during the build?
Scan the QR code on the box to access your AI build companion trained on this exact project. For additional help, reach our team via WhatsApp or email, and we'll guide you step by step.
Do I need a SIM card for the SIM800L?
Yes, a standard 2G/3G SIM with active SMS plan is required. The module supports 850/900/1800/1900 MHz bands — common in India.
Can I add a gas sensor to this kit?
Absolutely. The circuit and code include a dedicated analog input for a gas sensor like MQ-2 (not included). You can simply plug it in and adjust the threshold in the firmware; the AI companion will walk you through the process.
Is soldering required?
No soldering is needed. All connections are made on the included 400-point breadboard using jumper wires, making it easy to modify and reuse components.
Office — SIM800L on ESP32 sends SMS when PIR detects intruder or gas sensor fires above threshold.
What's in this kit
- ESP32 Dev Board
- SIM800L GSM
- HC-SR501 PIR
- LM2596 Buck Converter
- 1000µF 25V Caps x2
- 10kΩ Resistors x5
- 100nF Caps x5
- 400-pt Breadboard
- M-M Wires x20
- Micro USB Cable
Other projects you can build
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items