Microphone Array Beamformer Variant 14 Kit with ESP32
ESP32 Beamforming Microphone Array Kit — Steerable Zoom Mic for Precision Audio Capture
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 four-microphone array that implements real-time delay-and-sum beamforming to electronically steer its listening direction — zooming in on a speaker while rejecting ambient noise. Perfect for DIY conference systems, sound source tracking, voice isolation experiments, or any advanced audio application where you want to capture sound from a specific direction.
What You'll Build
A functional 4-channel beamforming microphone that captures audio with sharp directional selectivity. Four INMP441 I2S mics feed synchronized digital audio into an ESP32, which applies fractional delays and sums the signals in real time. Connect the amplified output via the 3.5mm jack to a speaker or recorder and hear how the array locks onto a target direction — a true acoustic zoom lens you can steer with a knob or code.
What You'll Learn
- Implement delay-and-sum beamforming algorithms on an ESP32 using configurable delay buffers
- Synchronize four I2S microphones and handle multi-channel audio data streams
- Use the MCP4728 quad DAC to output the summed beamformed signal with high resolution
- Interface a PAM8403 amplifier and design a clean power supply for low-noise audio
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| INMP441 I2S Mic | 4 |
| MCP4728 DAC | 1 |
| PAM8403 Amp | 1 |
| 4.7kΩ Resistors | 5 |
| 100nF Caps | 15 |
| PCB Prototype Board | 3 |
| 3.5mm TRS Jack | 1 |
| 5V 2A PSU | 1 |
| Enclosure Box | 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
Designed for electronics engineers, DSP enthusiasts, and advanced makers who want to explore real-time audio beamforming without starting from scratch. It suits B.Tech ECE final‑year projects, Smart India Hackathon sound‑localization challenges, IIT/NIT/VIT/BITS research work, and professional prototyping where directional audio capture or voice isolation is needed.
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 to talk to the AI companion trained on this kit’s code and wiring. If you need human help, reach out on WhatsApp for direct guidance from our team.
Can I integrate this with a Raspberry Pi or PC?
The ESP32 outputs audio via the 3.5mm jack, so you can feed it into any line‑level input on a Pi sound card or PC. For digital capture, the I2S streams can be routed to a Raspberry Pi with an I2S HAT, though that requires separate firmware.
Does the kit include pre‑written beamforming code?
Yes. The QR code leads to a microSD card image and source code with adjustable steering angle, ready to compile in Arduino IDE. You can tweak the delay coefficients or adapt the algorithm for different array geometries.
What is the angular resolution and frequency range?
With 4 mics spaced 3 cm apart in a linear array, the beam width at 1 kHz is approximately 30°, and the frequency response is 50 Hz – 15 kHz as limited by the INMP441 mics. Steering is smooth over ±90° with fractional‑delay resolution.
Four INMP441 I2S mics compute steerable delay-and-sum beamforming to zoom microphone in any direction.
What's in this kit
- ESP32 Dev Board
- INMP441 I2S Mic x4
- MCP4728 DAC
- PAM8403 Amp
- 4.7kΩ Resistors x5
- 100nF Caps x15
- PCB Prototype Board x3
- 3.5mm TRS Jack
- 5V 2A PSU
- Enclosure Box
- Soldering Iron
- Solder Wire
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.
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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