The hardware consists out of three PCBs so far: An analog PCB, a digital PCB and an active Backplane. Two PCBs are developed with KiCAD. One is developed with Altium.
A transimpedance amplifier is used to convert light into a voltage. With a
second stage this voltage is amplified. Both outputs are available for the ADC.
On the digital board there is besides an ESP8266, an ADC, an DAC and a temperature
sensor. The DAC is needed to steer the LED driver circuit, that excites the
