Small portable DIY illuminance meter

Lux meters are common devices among photographs or lighting specialists  – anywhere where illumination level is important parameter. Following lux meter developed by Sergei is capable of measuring illuminance in the range 0.025 – 99999 lux. He used MAX44007 sensor which is already factory calibrated. He’s chosen a C8051F304 microcontroller from Silicon Laboratories. It talks to lux sensor via I2C interface and also updates 128×32 graphical LCD. Lux meter is only a 30x60mm size and is powered by single CR3032 coin cell. Continue reading