Laser Frequency Splitter Variant 17 Kit with Arduino Mega + LDR
Laser Frequency Splitter Kit: Build a 4-Beam Harp with Arduino Mega & LDR
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Imagine plucking invisible strings of light and hearing distinct musical notes fill the room. This kit lets you construct a 4-beam laser harp—a sensor-based instrument that translates hand interruptions into rich audio, perfect for live performances, interactive installations, or advanced engineering capstones. No separate sourcing, no guesswork around compatibility.
What You'll Build
You’ll assemble a sturdy frame housing four parallel red laser beams aimed precisely at LDR sensors. When your hand breaks a beam, the Arduino Mega reads the voltage change via the LM393 comparators, instantly triggering the DFPlayer Mini to play a corresponding note from the microSD card through the PAM8403 amplifier. The result is a fully playable harp with four light-based strings that respond to gesture.
What You'll Learn
- Interfacing laser diodes and LDR sensors for reliable optical interruption detection
- Programming the Arduino Mega to sample multiple analog inputs and trigger real-time audio events
- Integrating a DFPlayer Mini with SD card storage and a PAM8403 amplifier for immediate sound output
- Calibrating beam alignment and mechanical stability to ensure consistent performance across all four strings
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Mega | 1 |
| 5mW Red Laser | 4 |
| LDR | 4 |
| DFPlayer Mini | 1 |
| MicroSD 8GB | 1 |
| PAM8403 Amp | 1 |
| LM393 Comparator | 4 |
| 10kΩ Resistors | 15 |
| PCB Prototype Board | 3 |
| 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
Advanced B.Tech ECE/EEE students tackling capstone projects or Smart India Hackathon challenges will find this kit ready for sensor-based interactive systems. It’s equally suited to hobbyists crafting laser-based musical instruments and makers from IITs, NITs, VIT, or BITS Pilani who need a pre‑integrated optical‑audio platform without hunting for individual components.
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 start a chat with the AI companion, which has step-by-step fixes for this exact laser harp. You can also reach us on WhatsApp for human backup.
Can I add more than four laser beams later?
The Arduino Mega has enough analog inputs to scale up. You’ll need extra lasers, LDRs, and a frame expansion; the AI companion includes guidance on modifying the circuit and code for additional strings.
What audio files work with the DFPlayer Mini?
The player reads MP3 and WAV files from the included 8GB microSD. Load any notes, chords, or custom samples—just name them sequentially for the code to detect them correctly.
How precise must the laser alignment be?
Alignment is crucial. Even slight misalignment can cause false triggers. The kit’s prototyping boards help build a rigid frame, and the AI companion walks you through a calibration routine to centre each beam on its LDR detector.
Two laser beams and LDR detectors on a single instrument frame detect hand interruptions on different strings.
What's in this kit
- Arduino Mega
- 5mW Red Laser x4
- LDR x4
- DFPlayer Mini
- MicroSD 8GB
- PAM8403 Amp
- LM393 Comparator x4
- 10kΩ Resistors x15
- PCB Prototype Board x3
- 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