Chord Organ Sequencer Kit with Arduino Mega + LED
8-Voice Chord Organ Sequencer Kit with Arduino Mega & OLED
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Turn a collection of components into a genuine polyphonic instrument. This kit creates an 8-voice chord organ sequencer that plays chord progressions in real time — all driven by timer interrupts on the Arduino Mega. Rotary encoders let you dial in the key and scale while the OLED instantly shows the active chord, making it possible to hear complex harmonies without a single line of code written from scratch.
What You'll Build
You will assemble a standalone digital chord organ that generates eight simultaneous tones through an MCP4725 DAC and a PAM8403 amplifier, outputting to a 3W speaker. The eight tactile buttons act as step inputs for your chord sequence, and two rotary encoders handle key selection and scale choice — major, minor, or modal. The 0.96-inch OLED keeps you informed of every change, turning a bare PCB into a playable instrument in a matter of hours.
What You'll Learn
- Polyphonic tone generation using timer interrupts on Arduino Mega
- Interfacing the MCP4725 12-bit DAC for high-quality audio output
- Reading rotary encoders for real-time musical parameter control
- Designing low-latency embedded sequencers that play chord progressions
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Mega 2560 | 1 |
| MCP4725 DAC | 1 |
| PAM8403 Amp | 1 |
| 3W 8Ω Speaker | 1 |
| Rotary Encoder | 2 |
| Tactile Button | 8 |
| 0.96in OLED | 1 |
| 10kΩ Resistors | 10 |
| 100nF Caps | 10 |
| 10µF Caps | 5 |
| PCB Prototype Board | 2 |
| Enclosure Box | 1 |
| 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 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
Ideal for B.Tech ECE/EEE students building their final-year embedded audio project, Smart India Hackathon teams prototyping real-time DSP instruments, and advanced hobbyists eager to implement polyphonic synthesis on Arduino Mega without starting from a blank schematic. It assumes comfort with soldering and the Arduino IDE.
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 inside the box to launch the AI build companion — it knows every step of this kit. For additional help, reach out on WhatsApp and our engineers will respond within 24 hours.
Do I need a separate programmer for the Arduino Mega?
No. The Arduino Mega connects to your computer via USB and can be programmed directly from the Arduino IDE. No external programmer is required.
Can I compose my own chord progressions?
Yes. The eight tactile buttons let you step through and reorder chords in real time. The open-source firmware can also be modified to support longer or more complex sequences.
How can I extend this with MIDI or other outputs?
The kit includes extra prototyping board and the firmware is fully open-source. You can add a MIDI port over serial, wire a line-level output jack, or integrate a display for custom parameters — all within the same enclosure.
8-voice tone generation via timer interrupts plays chord progressions. Rotary encoder selects key and scale.
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