Simple Spectrometer for Education Using Microcontroller

A simple spectrometer is constructed using Light Emitting Diodes of different colors as sources for this spectrometer. In order to calibrate the light sources, different types of LEDs are connected to the circuit of constant voltage to give lights of different colors. The colors of these LEDs are Blue, Green, Yellow, Orange and red with different wavelengths. The emission spectra of all LEDs were obtained from commercial standard companies to give the peak wavelengths of each LED, 400nm (Violet), 470nm (Blue), 525nm (Green), 574nm (Yellow), 590nm (Orange), 610nm (Orange), 625nm (Red), 700nm (Dark Red) respectively. These peak wavelengths are used as reference light sources for this spectrometer. The results of Absorption spectrum measurement show similar spectrum from standard measurement. Raspberry Pi microcontroller was used in this study to measure, to analyze data and display the absorption spectrum. This low-cost spectrometer is good enough for education which can be used in the normal schools or educational institutions using LEDs of several standard peak wavelengths.