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. 2019 Nov 19;8:e48178. doi: 10.7554/eLife.48178

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© 2019, Peng et al

This article is distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use and redistribution provided that the original author and source are credited.

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Appendix 1—figure 15. — 17. Solder red and black wires (approx. 10 cm) to contacts of 3 × 2/2 solenoid valves (v).

18. Include a diode (1N4007) between the contacts to avoid current from capacitor discharge damaging the remaining circuit.

19. Connect 2/2 solenoid valves to the 4-channel relay. Connect the red cable to the normally open contact and a yellow cable (approx. 10 cm) to the common contact. Document which relay is connected to each solenoid valve.

20. Screw on push-in fittings (s, q) onto the 2/2 solenoid valves.