Using the "Version B" flow cell design from the Höving et al. publication as a starting point, an initial prototype detector housing was designed in Tinkercad. Although only 2.6 x 1.8 cm in size, the Adafruit AS7341 sensor board is significantly larger than an LDR as used in the previous publication. As a result, modifications were required to encase the larger Adafruit AS7341 sensor board to create a lightproof box, whilst exposing the sensor pins to allow circuit prototyping with the Raspberry Pi and a breadboard (Figure ).