Arduino Spectrophotometer Kit for Beer-Lambert Concentration Analysis
Build a Precision Photodiode Spectrophotometer with Arduino Mega - Measure Absorbance, Calculate Concentration
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
This kit transforms an Arduino Mega into a functional spectrophotometer. Using a common-cathode RGB LED as a tunable light source and a BPW34 photodiode detector, you'll measure absorbance of liquid samples at three discrete wavelengths, then apply the Beer-Lambert law to calculate concentration. Ideal for chemistry lab experiments, engineering capstone projects, and research demonstrations where precision and data logging matter.
What You'll Build
A self-contained spectrophotometer that passes light through a sample cuvette, detects transmitted intensity, and computes absorbance, transmittance, and concentration. The 0.96in OLED displays real-time values while the MicroSD module logs timestamped readings via the DS3231 RTC. The dual LM358 op-amp stages condition the photodiode signal for high sensitivity. Build on a pair of PCB prototype boards, soldering everything together for a robust, compact instrument.
What You'll Learn
- Signal conditioning with op-amp transimpedance amplifier for a photodiode
- Implementing the Beer-Lambert law in Arduino code to convert absorbance to concentration
- RGB LED wavelength selection and calibration for spectrophotometric measurements
- Data acquisition, real-time RTC timestamping, and SD card storage for scientific logging
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Mega 2560 | 1 |
| BPW34 Photodiode | 1 |
| LM358 Op-Amp | 2 |
| RGB LED Common Cathode | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 0.96in OLED | 1 |
| 10k? Resistors | 10 |
| 100k? Resistors | 5 |
| 100nF Capacitors | 10 |
| 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 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 is designed for B.Tech ECE, EEE, and B.Sc. Physics/Chemistry students building capstone projects or preparing for research labs. It's also an excellent choice for Smart India Hackathon teams needing a precise analytical instrument, ATL Tinkering Lab mentors demonstrating photonics, and IIT/NIT/VIT/BITS undergraduates working on spectroscopy theses.
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?
Our AI companion walks you through each step, and you can message us on WhatsApp for human help within minutes.
Can I use this kit to measure concentration of an unknown sample?
Yes, after calibration with three known standard solutions you can compute unknown concentrations using the Beer-Lambert law; the OLED displays mg/mL directly.
What cuvettes are compatible?
Standard 10 mm path-length disposable cuvettes work best; you'll build the light path on the prototype board with a simple holder (not included).
Does it save data for later analysis?
All readings are timestamped by the DS3231 RTC and saved as CSV on the MicroSD card, ready for Excel or Python analysis.
RGB LED illuminates sample at 3 wavelengths. BPW34 photodiode measures absorbance. Calculates Beer-Lambert concentration.
What's in this kit
- Arduino Mega 2560
- BPW34 Photodiode
- LM358 Op-Amp x2
- RGB LED Common Cathode
- DS3231 RTC
- MicroSD Module
- 0.96in OLED
- 10k? Resistors x10
- 100k? Resistors x5
- 100nF Caps x10
- PCB Prototype Board 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