MIDI to CV Converter Kit with Arduino Uno
Hands‑On MIDI to CV Converter Kit with Arduino Uno – Drive Your Analog Synth with 1V/Oct Precision
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 note messages from any MIDI keyboard or DAW into precise control voltages that let you sequence vintage monophonic synths, modular gear, or DIY analog circuits. This kit walks you through reading MIDI over UART, isolating signals with an optocoupler, and generating a stable 1V/oct CV output using an MCP4725 12‑bit DAC. No more guessing resistor values – you’ll understand every line of code and every solder joint.
What You'll Build
You’ll assemble a standalone MIDI‑to‑CV converter on a prototype PCB. After soldering the interface, you can connect a MIDI cable from your controller and a 3.5mm TS patch cable to any analog VCO or filter. The firmware maps MIDI note numbers to calibrated 1V/oct voltages, so C3 is exactly 1V, C4 is 2V, and so on – ready to play melodies from your favourite keyboard through a eurorack oscillator.
What You'll Learn
- Decode MIDI note‑on/off messages over a UART serial link
- Interface an MCP4725 DAC via I2C and set precise output voltages
- Scale note numbers to true 1V/oct control signals with software calibration
- Solder through‑hole components, DIN sockets, and jack connectors on stripboard
- Test CV output with a multimeter and patch into a real analog synthesizer
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | x1 |
| MCP4725 DAC | x1 |
| 6N138 MIDI Optocoupler | x1 |
| MIDI DIN Socket | x1 |
| 220Ω Resistors | x5 |
| 4.7kΩ Resistors | x5 |
| 100nF Caps | x5 |
| PCB Prototype Board | x1 |
| 3.5mm TS Jack | x2 |
| 9V Battery Snap | x1 |
| Soldering Iron | x1 |
| Solder Wire | x1 |
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 CBSE Class 11‑12 students who want a music electronics project beyond blinking LEDs, and for B.Tech ECE/EEE students at IIT, NIT, VIT, or BITS building embedded music systems. It’s also perfect for ATL Tinkering Labs hosting synth workshops, Smart India Hackathon teams prototyping audio tools, and independent Indian synth DIY makers who crave reliable 1V/oct reference hardware without importing expensive modules.
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; it knows the exact schematic and code. If you still need help, send a WhatsApp message – our support team works with the same documentation to get you through the debugging fast.
Can this module drive my Moog/Make Noise/Behringer synth?
Yes. The output follows the 1V/oct standard used by most analog and modular synthesizers. Just patch the 3.5mm TS jack to your VCO’s pitch input and adjust the calibration trim value in the Arduino sketch if needed.
Do I need any external power supply?
The converter runs on a 9V battery (snap included). You can also power the Arduino Uno via USB while testing; the firmware handles both power options.
What MIDI sources work – only keyboards?
It accepts any standard MIDI DIN output: keyboards, drum machines, DAW interfaces, or even a vintage Atari. The optocoupler isolates the input so your computer’s ground won’t affect the CV output.
Reads MIDI note messages over UART and outputs corresponding 1V/oct CV voltage via MCP4725 DAC.
What's in this kit
- Arduino Uno R3
- MCP4725 DAC
- 6N138 MIDI Optocoupler
- MIDI DIN Socket
- 220Ω Resistors x5
- 4.7kΩ Resistors x5
- 100nF Caps x5
- PCB Prototype Board
- 3.5mm TS Jack x2
- 9V Battery Snap
- 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