Bill of Materials (BOM)

	Quantity
Electronics
Raspberry Pi Zero 2 W(H)	1
microSD Card	1
XL4015 Buck Converter Module	1
USB-C Pigtail	1
D4148 MOSFET Module (XY-MOS)	2
1N4007 Diode	2
BMP280 Pressure Sensor Module	2
12V DC VN-T1 Vacuum Pump	1
12V Normally Closed Solenoid Valve	1
12V Power Supply	1
Panel-Mount Socket for Barrel Plugs	1
Wires
Heat Shrink Tubing / Electrical Tape
(Optional) DuPont Connectors
Screws / Fasteners
M3x40 Socket Head Screw (DIN 912 / ISO 4762)	18
M3x8 Socket Head Screw (DIN 912 / ISO 4762)	6
M4x6 Button Head Screw (ISO 7380)	2
2.5mm Self-Tapping Screws	4
M3x3 (Short Version) Heat Set Inserts	24
Other
16.5 x 5 cm PC Water Cooling Reservoir	1
One-Way / Check Valve	1
T-Connector	1
G1/4 fitting	4
Silicone or PVC tubing
2k Epoxy / Potting Compound
(Optional) Hotglue

Electronics

Raspberry Pi Zero 2 WH

RPi website recommands at least 16GB, recommends 32GB
probably both to much
Pi OS Lite has a download image size of ~500MB
total disk space used (with dev tools) on my version is about ~3GB, so probably any size starting from 4GB should do

XL4015

only power leads requires, no data lines
cut one of the cheap cables that often come with all sorts of cheap electronics enough
for powering the Pi from the buck converter
powering the Pi directly to pins also possible, but bypassed fuse

XY-MOS

1N4007

used as flyback diode for protecting the MOSFETs
not 100% sure if right one as no datasheet for pump motor available, seems to work though

BMP280

get a 3.3V version for RPi
check datasheep if configured for I²C and address (should be 0x76, other config change needed)
absolute pressure sensor, vacuum value needs to be calculatet using current athmospheric pressue
could be automated using a 2nd sensor outside of vacuum
used because cheap and available as module
diffrential sensors more expensive and not available as module