Building Low Cost DIY Spectrometer using Raspberry Pi at Home

This project creates a portable spectral analysis system by interfacing an AS7341 spectral sensor with a Raspberry Pi running Python. The AS7341 is a multi-channel spectrometer device designed to quantify light intensity across specific visible and Near-Infrared (NIR) wavelengths. It connects to the Raspberry Pi using standard connecting wires to establish an I2C communication interface, allowing the host board to configure the sensor and retrieve raw light measurement data. Operating under Raspbian OS, a Python script utilizing the adafruit-circuitpython-as7341 library communicates with the sensor's internal analog-to-digital converters. When exposed to a light source reflected from or transmitted through a sample, the sensor captures discrete spectral bands simultaneously. The Raspberry Pi then processes these numerical intensity values in real time, enabling the system to evaluate the precise spectral signature of the target object. This setup eliminates the need for expensive laboratory benchtop spectrometers by leveraging the computational power of the Raspberry Pi 5 and the precision of modern solid-state optical sensing.

Real-time spectral analysis for testing fruit ripeness, milk and bio-constituent analysis, checking paint colors, and industrial production color tuning.