Signal Envelope Follower Chart Kit with Arduino Mega
Build a Real-Time Signal Envelope Follower Chart with Arduino Mega – Master DSP and Kalman Filtering
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Transform live audio into a dual-trace visual display that separates noise from meaningful amplitude dynamics. You’ll wire up a MAX9814 microphone amplifier, track raw peak voltages with an LM358, and run a Kalman filter on the Arduino Mega to smooth the signal. The 2.4-inch TFT plots both the jagged, unfiltered envelope and the clean, denoised version side by side—perfect for analyzing speech loudness, music transients, or any sound pattern in real time.
What You'll Build
A handheld audio envelope monitoring station that graphs the instantaneous amplitude of your surroundings. Point it at a speaker and watch the raw signal bounce with every syllable while the Kalman‑filtered trace follows the true loudness contour without false spikes. The finished board runs from a 9 V battery and fits in your palm, giving you a portable DSP instrument you can use for beat detection, voice activity measurement, or as a front‑end for further audio processing projects.
What You'll Learn
- Real-time analog signal conditioning with the MAX9814 microphone amplifier and LM358 precision peak detector
- Implementing a Kalman filter on the Arduino Mega to remove noise from audio amplitude data
- Driving a 2.4‑inch ILI9341 TFT display to render live, dual‑channel waveform charts
- Integrating analog front‑ends with digital processors on a prototyping board—no soldering iron worries with pre‑tested layouts
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Mega 2560 | 1 |
| MAX9814 Mic Amp | 1 |
| 2.4in TFT ILI9341 | 1 |
| LM358 Op-Amp | 1 |
| 100nF Capacitors | 10 |
| 10kΩ Resistors | 5 |
| PCB Prototype Board | 2 |
| 9V Battery Snap | 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 bias voltages, noise margins, and oscillation risks for the analog chain | Pre‑tested as a system: MAX9814 → LM358 → Mega ADC levels matched, no ground‑loop hum |
| Build support | Forums, scattered tutorials on Kalman filters for Arduino that rarely match your exact circuit | AI companion trained on this specific signal path and filter code, accessible by QR code |
| Time to first working build | Days of debugging the envelope detector and tuning the Kalman gain | Hours, with step‑by‑step calibration guidance and pre‑written Arduino sketches |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3‑5 days |
Who This Kit Is For
Designed for B.Tech ECE and EEE students diving into digital signal processing coursework or final‑year projects that demand live data visualization. Ideal for Smart India Hackathon teams who need a portable, hackable audio analyzer that can be adapted to gesture recognition or noise monitoring. Equally at home in CBSE Class 12 advanced electronics labs or the maker spaces of IITs, NITs, VIT, and BITS Pilani—wherever an understanding of real‑time filtering meets hardware.
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?
Open the AI companion via the QR code on the box; it can walk you through circuit checks, filter tuning, and code debugging. You can also message us on WhatsApp for direct engineer support.
Is the Kalman filter code pre-loaded or do I write it myself?
The Arduino Mega comes with a blank sketch; the AI companion provides the complete Kalman filter code calibrated for this exact analog front‑end. You’ll tweak the measurement noise and process noise values to see their effect.
Can I use this kit to detect beats in music?
Absolutely. The envelope follower tracks amplitude changes in real time. You can extend the provided code with a beat‑detection algorithm that triggers on rising edges of the filtered envelope.
Does the kit include a case or enclosure?
No separate enclosure is included; the boards are meant for prototyping. Many builders design a 3D‑printed case—the AI companion can suggest dimensions that fit the PCB.
MAX9814 audio peak detector tracked by Kalman filter. TFT shows raw signal and smooth envelope together.
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.
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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