6. Full Bill of Materials

Air Mattress Controller V1

Open-Source Adjustable Firmness System

6.0 6. Full Bill of Materials

6.1 Air System

Qty	Part Name	Recommended Model	Specification	Connector / Port	Recommended Wire	Description / Purpose	Est. Price	Purchase Link
1	Air pump	Active Aqua AADAP25L	AC dual-diaphragm, ~25 L/min	multi-outlet air ports	factory AC cord or 18 AWG if rewired	Main air source	$50–70	Buy
2	Fill valve	U.S. Solid 12V NC pneumatic valve	12V, 1/8" NPT, NC	1/8" NPT female	20–22 AWG	Inflation control	$12 each	Buy
2	Vent valve	U.S. Solid 12V NC pneumatic valve	12V, 1/8" NPT, NC	1/8" NPT female	20–22 AWG	Deflation control	$12 each	Buy
2	Check valve	1/4" inline air check valve	air-rated, low cracking pressure	barbed inline	n/a	Prevents backflow	$5–10 each	Buy
2	Tee fitting	1/8" NPT tee or matched barb tee	match tubing size	threaded or barb	n/a	Sensor + vent node	$5 each	Buy
as needed	Main tubing	silicone or PVC tubing	8–10 mm ID	matched to barb fittings	n/a	Main airflow lines	varies	Buy
as needed	Sensor tubing	silicone or PVC tubing	4–6 mm ID	matched to sensor ports	n/a	Pressure sensor taps	varies	Buy
as needed	Barb adapters	1/8" NPT to barb	match tubing sizes	threaded to hose barb	n/a	Fitting compatibility	varies	Buy
1	Manifold	custom printed	multi-inlet	custom	n/a	Combines pump outlets	custom	n/a
1	Plenum	custom printed or sealed chamber	small air volume	custom	n/a	Smooths airflow	custom	n/a

6.2 Electronics

Qty	Part Name	Recommended Model	Specification	Connector / Port	Recommended Wire	Description / Purpose	Est. Price	Purchase Link
1	MCU board	ESP32 DevKit V1 / equivalent	3.3V logic dev board	USB + 2.54 mm headers	24–26 AWG signal	Main controller	$8–10	Buy
2	Pressure sensor	NXP MPX5010DP	0–10 kPa analog differential	dual tube ports, 6-SIP	24–26 AWG signal	Measures mattress pressure	$17–20 each	Buy
1	Power supply	Mean Well LRS-75-12	12V, 6A AC-to-DC	screw terminals	18 AWG AC in, 18–20 AWG DC trunk	Powers low-voltage system	$14–25	Buy
1	Buck converter	LM2596 module	12V to 5V adjustable	screw terminal or pin header	20–22 AWG in, 22–24 AWG out	Powers ESP32	$5–10	Buy
4	MOSFET	IRLZ44NPBF / IRLZ44N	logic-level N-channel	TO-220	20–22 AWG load path, 24–26 AWG gate	Drives valves	$1–2 each	Buy
1	Relay	Omron G2R-1A-E DC12 or relay module	12V coil, AC-rated contacts	through-hole or module terminals	18 AWG AC load side, 24–26 AWG control	Switches pump live	$5–10	Buy
6	Flyback diode	1N4007	1A rectifier diode	through-hole axial	short local leads	Suppresses coil spikes	<$1 total	Buy
4	Gate resistor	220Ω resistor	1/4W through-hole	through-hole axial	24–26 AWG if leaded off-board	Gate stability	negligible	Buy
4	Gate pulldown resistor	10kΩ resistor	1/4W through-hole	through-hole axial	24–26 AWG if leaded off-board	Keeps MOSFET off at boot	negligible	Buy
2	LED resistor	330Ω resistor	1/4W through-hole	through-hole axial	24–26 AWG	Protects LEDs	negligible	Buy

6.3 Wiring and Connectors

Qty	Part Name	Recommended Model	Specification	Connector / Port	Recommended Wire	Description / Purpose	Est. Price	Purchase Link
1	AC inlet	Schurter 4304.6090	AC input with fuse and switch	IEC C14 / quick-connect tabs	18 AWG mains	Safe mains entry	$15–17	Buy
as needed	WAGO connectors	WAGO 221 series	lever connector	2- or 3-conductor lever nuts	18–22 AWG	Low-voltage distribution	varies	Buy
as needed	Ferrules	ferrule assortment	18–26 AWG	crimp ferrules	match wire gauge	Terminal safety	varies	Buy
as needed	Quick disconnects	insulated spade terminals	AC rated	spade / Faston	18 AWG	AC wiring	varies	Buy
1	Perfboard	Adafruit Perma-Proto 1609 or similar	FR4 prototyping board	0.1 inch hole grid	n/a	MOSFET + relay assembly	$10–18	Buy
as needed	AC wire	stranded wire	18 AWG	bare / ferruled / terminated	18 AWG	Mains wiring	varies	Buy
as needed	Power wire	stranded wire	20–22 AWG	bare / ferruled / terminated	20–22 AWG	Valves / relay coil	varies	Buy
as needed	Signal wire	stranded wire	24–26 AWG	jumper / hookup wire	24–26 AWG	Logic / sensors	varies	Buy

6.4 UI and Enclosure

Qty	Part Name	Recommended Model	Specification	Connector / Port	Recommended Wire	Description / Purpose	Est. Price	Purchase Link
2–4	Pushbutton	momentary pushbutton	panel mount	solder lugs or terminals	24–26 AWG	Setup / mode / test input	varies	Buy
2	LED	5mm LED	standard indicator	through-hole leads	24–26 AWG	Status / error indication	varies	Buy
1	Buzzer	piezo buzzer	3–5V or suitable	through-hole or leaded	24–26 AWG	Optional feedback	varies	Buy
1	Enclosure	project box	sized for pump + electronics	n/a	n/a	Main housing	varies	Buy
4	Rubber mounts	isolation feet or grommets	soft mounting	mechanical mount	n/a	Pump vibration reduction	varies	Buy
1	Strain relief	cable gland	AC rated	panel mount gland	18 AWG mains cable	Safer mains entry	varies	Buy

6.5 Required Tools and Setup Items

Qty	Item	Recommended Type	Description	Purpose	Purchase Link
1	Computer	Windows / macOS / Linux	development workstation	Programming and monitoring the ESP32	n/a
1	USB cable	data-capable USB cable	not charge-only	ESP32 programming and serial monitoring	Buy
1	Multimeter	digital multimeter	basic voltage and continuity measurement	Voltage setup and wiring verification	Buy
1	Arduino IDE	software	free development environment	Upload test code and open Serial Monitor	Download
optional	PlatformIO	software	alternative development environment	Advanced development workflow	Download
as needed	Jumper wires	male/female assortment	temporary prototyping leads	Early wiring and testing	Buy

DIY Air Mattress Controller V1 • Open Source Project