Pi Pico Wearable Breathalyser
Build a Wearable Breathalyser That Talks to Your Phone – The Pi Pico Wristband Kit
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Create a wrist-worn breathalyser that detects alcohol vapour and sends real-time concentration data to your phone over Bluetooth Low Energy. An illuminated LED ring provides immediate visual feedback, changing colour from green to red as levels rise. This practical wearable prototype is an ideal foundation for Smart India Hackathon projects or B.Tech minor submissions.
What You'll Build
You'll assemble a compact, rechargeable wristband device using the Raspberry Pi Pico W as the brain. The MQ-3 sensor reads alcohol concentration from breath, while the WS2812B ring shows instant visual alerts. A companion script running on your phone receives BLE transmissions to log and display the readings, giving you a complete IoT health-monitoring prototype.
What You'll Learn
- Interface analogue gas sensors and calibrate the MQ-3 module with MicroPython
- Program addressable RGB LEDs to create dynamic status indicators
- Set up Bluetooth Low Energy (BLE) communication between the Pico W and a smartphone
- Design a portable wearable circuit with LiPo charging and power management
Kit Contents
| Component | Quantity |
|---|---|
| Raspberry Pi Pico W | 1 |
| MQ-3 Alcohol Sensor | 1 |
| WS2812B 8-LED Ring | 1 |
| 3.7V LiPo 500mAh | 1 |
| TP4056 Module | 1 |
| 10kΩ Resistors | 5 |
| 470Ω Resistors | 5 |
| PCB Prototype Board | 2 |
| Velcro Wristband | 1 |
| Soldering Iron | 1 |
| Solder Wire | 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
This intermediate kit is designed for CBSE Class 11-12 students building practical science projects, B.Tech ECE/EEE undergraduates exploring sensor networks, and participants of Smart India Hackathon or ATL Tinkering Lab initiatives. If you've tinkered with a breadboard before and want to move into wearables and BLE, this kit delivers a self-contained challenge.
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 chat with our AI build companion, which has step-by-step guidance for this exact project. If you need human help, our WhatsApp support is just a message away.
Can I use this kit for educational fairs and competitions?
Absolutely. The wearable form factor and BLE functionality make it a standout for CBSE science exhibitions, inter-college tech fests, or Smart India Hackathon. The build teaches real-world IoT concepts judges love.
Do I need prior soldering experience?
The kit includes a soldering iron, and the AI companion includes a short soldering primer video. With patience and the included practice PCB, a first-time solderer can complete the build within the estimated time.
Is the alcohol sensor accurate enough for health claims?
The MQ-3 is suitable for educational demonstrations and prototype proof-of-concepts. It is not a medical or legally calibrated instrument. This kit focuses on teaching sensor integration and BLE communication.
MQ-3 alcohol sensor on Pico in a wristband. BLE broadcasts alcohol level to phone. Visual LED ring alert.
What's in this kit
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
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