Auto Chord Harmoniser Kit with Arduino Mega
Auto Chord Harmoniser Kit with Arduino Mega: Build a Voice Harmoniser
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
One voice enters the MAX9814 microphone, and just milliseconds later, dual DFPlayer modules layer your melody with perfectly pitched thirds and fifths—no backing tracks, no pre‑recorded harmonies. This kit decodes your pitch using FFT on an Arduino Mega and constructs a live choir around your melody, making it a compelling project for music technology enthusiasts and final‑year engineering prototypes alike.
What You'll Build
You will assemble a standalone vocal harmoniser unit housed in an enclosure. Connect the microphone, power up, and sing—the system instantly analyses the fundamental frequency and triggers harmony samples stored on microSD cards. The PAM8403 amplifier drives a 3W speaker, producing clear, layered audio that follows every note you sing in real time.
What You'll Learn
- Implementing FFT‑based pitch detection on an Arduino Mega for live audio input
- Synchronising two DFPlayer Mini modules to play simultaneous harmony intervals (thirds and fifths)
- Designing a mono audio amplifier circuit with the PAM8403 and filtering noise using passive components
- Soldering and assembling a complete DSP‑based audio system inside a portable enclosure
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Mega 2560 | 1 |
| MAX9814 Mic | 1 |
| DFPlayer Mini | 2 |
| MicroSD Card 8GB | 2 |
| PAM8403 Amp | 1 |
| 3W 8Ω Speaker | 1 |
| 4.7kΩ Resistors | 5 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| Enclosure Box | 1 |
| 9V 1A PSU | 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 advanced kit suits B.Tech ECE/EEE students finalising a major project, Smart India Hackathon participants prototyping music‑tech solutions, and electronics hobbyists who want to explore real‑time audio processing. It also makes an impressive demonstration piece for ATL Tinkering Labs or IIT/NIT/VIT/BITS project showcases.
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 AI companion can debug your code and circuit assembly step by step; if you still need help, message us on WhatsApp for direct audio‑specific guidance.
Can I load my own harmony samples on the microSD cards?
Yes, the DFPlayer modules read standard FAT‑formatted cards, so you can replace the provided samples with any 16‑bit WAV files pre‑named according to the Arduino sketch.
Does this work with live performances or only in a quiet room?
The MAX9814’s automatic gain control handles moderate background noise, but for the cleanest pitch tracking we recommend using it in a controlled environment or with a close‑mic setup.
What software do I need to upload the code?
The kit works with the Arduino IDE; the AI companion provides the complete, commented sketch and all required libraries, no other tools needed.
Detects sung pitch via FFT and adds harmonised thirds and fifths through separate DFPlayer sample layers.
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