“This project is about making portable luxmeter. It can be used in schools, where children can measure different kinds of light sources.
Functions:
1. measure intensity of light in lux.
2. calculate solar irradiation from lux to watts/m2 (factor 112)
3. charging battery using USB port
Total cost is around 13 $ without case. Luxmeter take 15 mA, so it will works long time on one Li-Ion battery.”