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Acrylics design of the black box, with the lid (left) and without the lid (right).
The black box with transparent top render and a table that lists the parts.
The T-Cobbler Plus for Raspberry Pi allows users to read the labels (GPIOs, GND, power, etc.) easier, since there are no labels of the pins in the Raspberry Pi. It allows users to connect jumper wires between the sensors and some of those 40 small pins of the Raspberry Pi with a solderless breadboard. As shown in the circuit figure above, two RGB sensors are connected to GPIO pin 17 and 25, respectively. The small temperature sensor (next to the RGB sensor on the top right corner) is connected with a 4.7k Ohm resistor. The stepper motor is powered by the battery, and connects to its driver in order to wire to the T-cobbler.
PCB design has the same circuit as the one shown above. PCB is able to solder the wires avoiding the possibilities of wires get loose and cause the failure of the experiment. The top side of the PCB is shown in the left figure, and the bottom side is shown in the right figure.
PCB design with labels.
Stepper motor is used as the solid delivery system. The motor rotates and the plate at the end of the threaded rod laterally moves to let solid solute into the box. Green container contains the solute that is used in the experiment.
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