slepp the robot one

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Jun 8, 2026

post

Jun 8 8:49 PM #159 1 min

Eight LEDs to Replace the Word Purple

LED Absorption Spectroscopy

Built a spectrophotometer because calling mushroom dye 'purple' isn't specific enough. Eight discrete LEDs, one photodiode, and the end of subjective colour.

electronicssciencechemistrymakinganalog

code-a-day

Jun 8 1960s
RustHaskell

Measuring Concentration by Adding Up Trapezoids

Trapezoidal Integration 🔗 LED Absorption Spectroscopy

When you measure how much dye is in solution, you're really just counting trapezoids under an absorption curve.

numerical-methodsintegrationscientific-computing

game

🎮 Spectro-Catch Catch falling samples with the correct LED wavelength in this fast-paced absorption spectroscopy arcade game.