Soil pH Field Tester Kit v4
Build a Voice-Activated Soil Analysis Tool with Raspberry Pi Zero 2W
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 standing in a field, soil samples in both hands, and simply saying “start pH test.” This kit turns that scenario into a working prototype. You’ll assemble a compact, battery-powered system where a Raspberry Pi Zero 2W runs Vosk offline speech recognition, listens to your commands through a USB microphone, and instantly triggers one of four relays—each ready to control a soil probe, pump, indicator light, or alarm.
What You'll Build
You’ll create a voice-controlled relay hub that interprets spoken words without needing any internet connection. The moment you say a recognised command, the corresponding relay toggles. The box can sit beside you during soil sampling, letting you activate diagnostic routines, rinse probes, or log data—entirely hands-free. This is a real-world embedded system that bridges agriculture and modern IoT.
What You'll Learn
- Flashing Raspberry Pi OS and configuring a headless setup for field deployment
- Integrating Vosk offline speech recognition with custom Python scripts
- Controlling 4-channel relay modules via GPIO pins safely
- Processing USB microphone audio and optimising recognition for outdoor environments
Kit Contents
| Component | Quantity |
|---|---|
| Raspberry Pi Zero 2W | 1 |
| 5V 4-Channel Relay | 1 |
| USB Microphone | 1 |
| MicroSD Card 16GB | 1 |
| Micro USB Cable | 1 |
| M-F Wires | 15 |
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 kit is designed for intermediate learners exploring the intersection of agriculture and technology. It’s a strong fit for B.Tech ECE/EEE students tackling mini projects, Smart India Hackathon teams prototyping IoT field devices, and CBSE Class 12 computer science students building practical voice applications. ATL Tinkering Labs and NIT/VIT/BITS clubs will find it instantly useful for demonstrating offline AI and relay automation.
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.
Does this kit include a soil pH sensor?
No, it provides a voice-controlled relay output stage. You can connect your own pH electrode module, pump, or buzzer to any of the four relays, and the included scripts will toggle them on your spoken commands.
Can I change the trigger commands?
Absolutely. The Vosk model listens for a small set of predefined phrases. You can edit the Python code to add new words like “measure pH,” “calibrate,” or “flush,” and retrain the recognizer if needed—the AI companion shows how.
Does this run without Wi-Fi?
Yes. After the initial OS and software setup (done once with your computer), the speech recognition runs entirely offline on the Pi. This makes it suitable for remote fields without internet.
What prior knowledge do I need?
Basic familiarity with Python and the terminal helps, but the AI companion walks you through every step from flashing the SD card to wiring relays. If you’ve ever built a simple Arduino circuit, you’ll feel comfortable.
Soil Analysis — Raspberry Pi Zero 2W runs vosk offline speech recognition — recognised commands trigger relay outputs.
What's in this kit
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