Inflatable buttplug and edging sensor: schematics and part list

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part list: 

C1     electrolytic capacitor, 47µF / 16V

C2     electrolytic capacitor, 1µF / 6.3V

C3     ceramic capacitor 10nF / 6.3V

C4     ceramic capacitor 470pF / 6.3V

R1     resistor 680Ω

R2     resistor 200kΩ (or 2x 100kΩ)

U1     5V voltage regulator, L7805 or equivalent

U2     MXP5100 DP pressure sensor

U3     NodeMCU ESP8266 E12 (an Amica board in my case, but any ESP8266 should work. The pin            assignment might differ, double-check that)

U4     ULN2803 darlington array

external connections:

J1     12V power supply input. 500mA should be enough (depends on the chosen pump and valve,               with my components, it's 250-300 mA)
J2     Connection to pump. I use a DAYPOWER LP27-12 which is rated at 12V, 230mA and delivers           1.5 l/min at 0.8 bar. A slightly larger pump is OK (the sensor goes up to 1 bar)
J3     Connection to valve. Any magnetic valve that operates at 12V should work. It needs to be                   closed when power is off.