Photodiode Spectrophotometer Kit - Build a Concentration Analyzer with Arduino Mega

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Illuminate a sample at three distinct wavelengths using an RGB LED, capture transmitted light with a BPW34 photodiode, and let Arduino Mega calculate concentration through real-time absorbance processing. Whether you're quantifying dye in a solution or verifying Lambert-Beer linearity for a school submission, this instrument delivers lab-grade precision from components you assemble yourself.

What You'll Build

A working spectrophotometer that reads absorbance at red, green, and blue wavelengths, displays concentration on a 0.96-inch OLED, logs readings to a microSD card with timestamps, and allows you to export raw voltage and absorbance data for graphing. The final instrument fits on a PCB prototype board and runs on a standard 9V battery, making it portable for field experiments.

What You'll Learn

• How to construct a transmissive spectrophotometer using an RGB LED as a selectable-wavelength light source
• Amplifying and conditioning photodiode signals with LM358 op-amps for microvolt sensitivity
• Applying Beer-Lambert law to calculate concentration from absorbance ratios
• Timestamped data logging with a DS3231 real-time clock and microSD module for repeatable experiments

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

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.