Led Based Photometer

摘要

There's a new sensor that I'd like to share with you this month that only requires a few LEDs and a resistor. Therefore, you probably already have everything in your junk box needed to build it. As you read in this article, you'll see that I still have a few concerns about the performance of this sensor. Even flying three of them into near space didn't answer all the questions. Oh well, that's just a reason to launch another near space mission.