Acoustic Modem Underwater Comms Kit with Arduino Mega + LED
Acoustic Modem Underwater Communication Kit with Arduino Mega – Build an FSK Data Link Through Water
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Build a working acoustic modem that transmits text, sensor data, or commands through a water tank, pool, or even a local pond. The modulated audio signal, carried by ultrasonic sound waves, mirrors the technology used in subsea ROVs and oceanographic sensors. It’s a complete hands-on dive into digital communication over an unusual physical layer.
What You'll Build
You’ll assemble two identical transceiver nodes, each with an Arduino Mega, speaker/mic pair, and OLED display. Upon code upload, they’ll exchange FSK-encoded messages through water — you’ll type on a serial monitor, see data appear on the other node’s screen, and log transmissions to an SD card with precise timestamps from the RTC. The result is a fully functional, bidirectional underwater data link ready for experimentation.
What You'll Learn
- Modulate and demodulate binary data using frequency-shift keying (FSK) on audio carriers
- Process and amplify weak acoustic signals with MAX9814 mic amps and PAM8403 power amps for reliable underwater detection
- Implement time-stamped data logging on MicroSD and coordinate dual OLED displays in a real-time embedded system
- Debug signal integrity, attenuation, and synchronisation in a non-trivial physical medium
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Mega 2560 | 2 |
| PAM8403 Amp Module | 2 |
| MAX9814 Mic Amp Module | 2 |
| 3W 8Ω Speaker | 2 |
| DS3231 RTC Module | 1 |
| MicroSD Module | 1 |
| 0.96in OLED Display | 2 |
| 100nF Ceramic Capacitor | 10 |
| PCB Prototype Board | 2 |
| 9V Battery Snap with DC Jack | 2 |
| 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
Engineering students pursuing B.Tech in ECE or EEE, especially those preparing final-year projects in underwater communication, IoT, or robotics. It’s ideal for participants in Smart India Hackathon, DRDO student challenges, or autonomous underwater vehicle competitions at IITs, NITs, VIT, BITS, and other technical universities. Hobbyists with solid Arduino experience who want to explore unconventional data links will find it both challenging and rewarding.
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?
The kit’s QR code gives access to an AI companion trained on this exact project, and you can reach our engineers via WhatsApp for personalized help.
Do I need prior experience with signal processing or communication theory?
Basic Arduino familiarity is essential, but the provided code and build manual explain FSK modulation clearly. The AI companion and community fill any gaps.
Can I use this kit for my B.Tech final year project on underwater sensor networks?
Absolutely. The kit is designed as a research-grade demonstrator; you can extend the firmware to implement custom protocols, mesh networking, or integrate additional sensors.
What kind of water environment is needed for testing?
A bucket, aquarium, or small pool works perfectly. Larger bodies up to a few metres depth work, though range depends on water clarity and ambient noise. The open design lets you experiment with transducer improvements.
PAM8403 amp and MAX9814 mic form acoustic modem. FSK modulated audio transmits data through water.
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.
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