I am helping my HS freshman son in a science project to measure ambient light at different elevations. We have a friend in a high altitude (100,000 ft) balloon club who offered a 750 gram payload on a flight this spring! What a great opportunity. We bought a TAOS "light to voltage" photodiode TSL14S-LF and made the circuit at http://www.sciencebuddies.org/science-fair-projects/project_ideas/Elec_p037.shtml When pointed at the sky the output tops out at 4.5 V so I think that is full scale. I need ideas about how to change the circuit to get more dynamic range. Or maybe I need a different photodiode. Maybe we should use a photoresistor or something else? Thanks for the help!
Bob
Bob