Color Wheel

The Color Wheel experiment does not require an Experiment Module, but runs using just the Core Unit and laser cut flow cells. There is also a 3D printed stand for viewing the flow cells.

Code (Thonny Micropython)

• Download and install Thonny to your computer (https://thonny.org/)

• Flash the latest version of the Micropython UF2 firmware onto your Raspberry Pi Pico W (https://micropython.org/download/RPI_PICO_W/)

• Download, extract and upload the following files contained within Pico_Code.zip onto your Pico W. These are the libraries that control the servos.

• Download and load Color_wheel_v1.py into Thonny. Run the file from Thonny and follow the prompts to set the pump parameters and run the pumps.

Flow Cells

Clamped together with 4 mm x 20 mm nuts and bolts. Fitting holes are designed for Injectech LLC luer fittings (P/N 80369-7 Female Luer Lock Bond-In Port .192/.183 (acrylic) and 80369-7 Female Luer Lock Bond-In Port .065/.056 (acrylic)). You may need to adjust your fitting hole sizes to meet the dimensions of your own fittings.

• Laser cut 3 mm clear acrylic - color_wheel_cover.svg

• Laser cut 3 mm white acrylic - color_wheel_backing.svg

• Laser cut 6 mm acrylic (any color) - color_wheel_drain.svg

• Laser cut 1.5 mm cork or silicone gasket material -  color_wheel_reservoir_gasket.svg

• Flow patterns. Try one of these or make your own.

  • Laser cut 1.5 mm cork or silicone gasket material - color_wheel_path_gasket_v1.svg

  • Laser cut 1.5 mm cork or silicone gasket material - color_wheel_path_gasket_v2.svg

Mixing Valve

The mixing valve has 3 inlets for each pump and one outlet. It is made from two pieces of 6 mm acrylic, a 1.5 mm cork gasket, glue in luer fittings , and 4 mm x 15 mm nuts and bolts. Holes for fittings may need adjustment for your fitting.

• mixing_valve_middle_v8.svg - laser cut from 1.5 mm cork gasket material

• mixing_valve_bottom_v8.svg and mixing_valve_top_v8.svg - laser cut from 6 mm acrylic sheet

• Fitting holes are designed for Injectech LLC luer fittings (P/N 80369-7 Female Luer Lock Bond-In Port .192/.183 (acrylic) and 80369-7 Female Luer Lock Bond-In Port .065/.056 (acrylic)). You may need to adjust your fitting hole sizes to meet the dimensions of your own fittings. If the fittings are acrylic use acrylic adhesive or I have found ABS glue to also work.