optical sensor and datalogger

This was a 6 photodiodes sensor with integrated adjustable amplifier and ADC, clock power supply and SD storage. The review was very quick, comments were really helpful, and the overall service was amazingly fast. I was a bit worried initially as the design is intended to measure very small analog signals and mixes analog and digital signals, but it turned out fine. The few oddities (via very close to pads) were well done, and the soldering turned out to be pretty easy. Overall, I'm really satisfied with how it turned out ; I haven't been able to find any competitor which can provide such a cheap, fast and good service.