Bill of material

Overview of parts

Mandatory

1. You need to have a Raspberry Pi Zero W (the W is for "Wireless Lan", there is also a non-W edition).
2. You need a microSD-Card to copy the Image to
3. You need a Power Supply or Battery delivering 5V/2A

Membrane Pump

It is necessary to use an air pump which is stabilized and has a known airflow or use an airflow meter. We tested with Thomas 1410V (12V - ~300€) or 2002 (3.3V - ~150€) Diaphragm Pumps.
The airflow is mandatory for correct calculation and has to be adjusted in the python script - we're happy to help you out here, just contact us.

Stabilized membrane pump

Download 3D Printable files (A-E)

STL for 3D Printing (SLA or FDM) github repository - printing material ~10€

A-E:
Print on any 3d printer or send to any service provider. Use black filament / resin. If possible, use flex filament or mix resin with flex resin. 200g Resin / FDM ~ $5-$10
- 3D printing service is more expansive (~$100)

Download PCB / Gerber Files for bcMeter 12V or 5V (F)

We recommend using the 5V PCB. The 12V is meant to be soldered by absolute beginners but is less accurate. the 5V pcb is more advanced but harder to assemble.

(find gerber files for PCB fabrication on bcmeter.org) ~$25

We have a small stock of PCBs available, just contact us, if interested.

bcMeter SMD PCB for 5V and smaller pumps

Bill of Material for the small PCB (SMD, 5V) (G)

Link to Mouser Basket for one-click-order

	Mouser No	Mfr. No	Manufacturer	Description	RoHS	Order Qty.	Price (EUR)	Ext.: (EUR)	Position on PCB of bcMeter
1	279-CRGCQ0805F100R	CRGCQ0805F100R	TE Connectivity	Thick Film Resistors - SMD CRGCQ 0805 100R 1% SMD Resistor	RoHS Compliant By Exemption	2	0,26 €	0,51 €	R3 R4
2	603-RC0805FR-074K7L	RC0805FR-074K7L	YAGEO	Thick Film Resistors - SMD 4.7 kOhms 125 mW 0805 1%	RoHS Compliant By Exemption	2	0,10 €	0,19 €	R7
3	603-RC0805FR-072K21L	RC0805FR-072K21L	YAGEO	Thick Film Resistors - SMD 2.21 kOhms 125 mW 0805 1%	RoHS Compliant By Exemption	2	0,10 €	0,19 €	R1 R2
4	603-RC0805FR-07470RP	RC0805FR-07470RP	YAGEO	Thick Film Resistors - SMD 470Ohms 1/8W 0805 1%	RoHS Compliant By Exemption	1	0,21 €	0,21 €	R6
5	781-SI2318DS-GE3	SI2318DS-T1-GE3	Vishay	MOSFET 40V 3.9A 1.25W 45mohm @ 10V	RoHS Compliant	1	0,55 €	0,55 €	Q5
6	187-CL21B104KACNNNC	CL21B104KACNNNC	Samsung Electro-Mechanics	Multilayer Ceramic Capacitors MLCC - SMD/SMT 100nF+/-10% 25V X7R 0805	RoHS Compliant	2	0,10 €	0,19 €	C2 C12
7	771-MMBT3904VL	MMBT3904VL	Nexperia	Bipolar Transistors - BJT TRANS BIPOLAR	RoHS Compliant	2	0,11 €	0,21 €	Q3 Q4
8	710-875115644009	875115644009	Wurth Elektronik	Aluminium Organic Polymer Capacitors WCAP-PSHP 35V 10uF 20% ESR=75mOhms	RoHS Compliant	2	0,77 €	1,54 €	C9 C14
9	667-10SVP4R7M	10SVP4R7M	Panasonic	Aluminium Organic Polymer Capacitors 10volts 4.7uF ESR 240mohm	RoHS Compliant	1	1,30 €	1,30 €	C1
10	603-CC805KRX7R8BB103	CC0805KRX7R8BB103	YAGEO	Multilayer Ceramic Capacitors MLCC - SMD/SMT 25V 0.01uF X7R 0805 10%	RoHS Compliant	2	0,11 €	0,23 €	C8 C11
11	603-CC805KKX7R8BB105	CC0805KKX7R8BB105	YAGEO	Multilayer Ceramic Capacitors MLCC - SMD/SMT 25V 1uF X7R 0805 10%	RoHS Compliant	2	0,24 €	0,48 €	C3 C13
12	603-AC805KRX7R9BB102	AC0805KRX7R9BB102	YAGEO	Multilayer Ceramic Capacitors MLCC - SMD/SMT 50V 1000pF X7R 0805 10% AEC-Q200	RoHS Compliant By Exemption	3	0,19 €	0,57 €	C4 C7 C10
13	710-151031VS06000	151031VS06000	Wurth Elektronik	Standard LEDs - Through Hole WL-TMRC THT Mono Diffusd Rnd3mm BrtGn	RoHS Compliant	1	0,16 €	0,16 €	D1
14	720-IRL81A	IRL 81A	ams OSRAM	Infrared Emitters Infrared 850nm Half Angle +/-12DEG	RoHS Compliant	2	1,01 €	2,02 €	D2 D3
15	485-374	374	Adafruit	Adafruit Accessories DS18B20 Digital Temperature Sensor	RoHS Compliant	1	3,75 €	3,75 €	J8
16	279-CRGCQ0805J10K	CRGCQ0805J10K	TE Connectivity	Thick Film Resistors - SMD CRGCQ 0805 10K 5% SMD Resistor	RoHS Compliant By Exemption	1	0,19 €	0,19 €	R5
17	855-M20-9774046	M20-9774046	Harwin	Headers & Wire Housings 40 SIL VERTICAL PIN HEADER TIN	RoHS Compliant	1	1,40 €	1,40 €	J1 J2 J3 J4 J5
18	710-61304021821	61304021821	Wurth Elektronik	Headers & Wire Housings WR-PHD DUAL SCKT HDR 2.54MM	RoHS Compliant	1	1,82 €	1,82 €	J6
19	863-NCP1117ST33T3G	NCP1117ST33T3G	onsemi	LDO Voltage Regulators 3.3V 1A Positive	RoHS Compliant	1	0,65 €	0,65 €	U1
20	579-MCP3426A0TE/SN	MCP3426A0T-E/SN	Microchip	Analog to Digital Converters - ADC 16-bit delta-sigma ADC dual chan 15sps	RoHS Compliant	1	3,25 €	3,25 €	U2
							Merchandise:	19,41 €

Bill of Material for general purpose PCB (THT components & 12V DC Barrel Jack) (G)

bcMeter general purpose PCB for 12V and large pumps. We recommend using the 5V PCB. The 12V pcb is meant to be soldered by absolute beginners but is less accurate. the 5V pcb is more advanced but harder to assemble.

Link to mouser basket for one-click-order

Mfr. No	Manufacturer	Description	Order Qty.	Price (EUR)	Ext.: (EUR)
MCP3426A6-E/MS	Microchip	Analog to Digital Converters - ADC 16bit deltasigma ADC dual channel 15sps	1	2,35 €	2,35 €
IRL 81A	Osram Opto Semiconductor	Infrared Emitters Infrared 850nm Half Angle +/-12DEG	2	0,88 €	1,76 €
LPT 80A	Osram Opto Semiconductor	Standard LEDs - SMD PHOTOTRANSISTOR	2	0,76 €	1,52 €
RCER72A103K0K1H03B	Murata	Multilayer Ceramic Capacitors MLCC - Leaded 0.01uF 100volts X7R LS=5mm +/-10%	3	0,47 €	1,42 €
TAP334M035SCS	AVX	Tantalum Capacitors - Solid Leaded 35V 0.33uF 20% ESR=1 5 Ohm	2	0,55 €	1,10 €
CON-SOCJ-2155	Gravitech	DC Power Connectors Power Jack/Connector 2.1mm x 5.5mm	1	1,01 €	1,01 €
K102K15X7RF53H5G	Vishay	Multilayer Ceramic Capacitors MLCC - Leaded 50V 1nF 10% X7R e3 Auto	3	0,31 €	0,94 €
RDEC71E106K2M1H03A	Murata	Multilayer Ceramic Capacitors MLCC - Leaded 10uF 25volts X7S 10%	1	0,86 €	0,86 €
RDER71E104K0M1H03A	Murata	Multilayer Ceramic Capacitors MLCC - Leaded 0.1uF 25volts X7R 10 %	2	0,40 €	0,80 €
L7805CV	STMicroelectronics	Linear Voltage Regulators 5.0V 1.0A Positive	1	0,57 €	0,57 €
L7809CV	STMicroelectronics	Linear Voltage Regulators 9.0V 1.0A Positive	1	0,42 €	0,42 €
MMBT3904-G	Comchip Technology	Bipolar Transistors - BJT VCEO=40V IC=200mA	1	0,19 €	0,19 €
MBA02040C2261FC100	Vishay	Metal Film Resistors - Through Hole .4watt 2.26Kohms 1% 1/8watt body size	2	0,09 €	0,19 €
CFR25SJT-26-10K	YAGEO	Carbon Film Resistors - Through Hole 10 kOhms 250 mW 5% - 350/ +500 PPM / C	1	0,09 €	0,09 €
OM1015E-R58	Ohmite	Carbon Film Resistors - Through Hole 100 Ohm 1W 5% 500 Vo lt	1	0,09 €	0,09 €
				Merchendise	13,31 €

Filter Paper (H)

Pallflex T60A20 Filter Paper was used during developement and is sadly discontinued. We have a small stock of T60A20 left, so we may send you some material.

We're testing the better available https://www.amazon.com/7194-Non-Heat-Pallflex-Tissuquartz-Laboratory/dp/B0731SG18R.
Or you may send us a sample of your filter paper and we happily calibrate bcMeter with it!

Amazon Links for additional Material (I)

Description	Quantity	Price	Link
22AWG Wire	1	$9.99	https://www.amazon.com/NorthPada-Electronic-Electrical-Tinned-Voltage/dp/B08979VWP5/ref=sr_1_15?dchild=1&keywords=22+awg+wire&qid=1626014422&sr=8-15
Hot Glue	1	$6.99	https://www.amazon.com/Baffo-Adhesive-Project-Craftwork-Diameter/dp/B07XC3VJRH/ref=sr_1_8?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=hot+glue+black+sticks&qid=1626014378&refresh=1&sr=8-8
Rubber Band	1	$12.95	https://www.amazon.com/Neoprene-Rubber-Black-Self-Adhesive-Sponge/dp/B00EE9HTPW/ref=sr_1_10?dchild=1&keywords=Rubber+Shore+A+tape&qid=1626014507&sr=8-10
Silicone Hose	1	$3.99	https://www.amazon.com/Silicone-Vacuum-Hose-Performance-Black/dp/B07792YB15/ref=sr_1_14?dchild=1&keywords=silicone+hose+5mm&qid=1626014620&sr=8-14
m3 Threads	1	$12.59	https://www.amazon.com/iplusmile-Embedment-Threaded-Printing-Projects/dp/B087NBYF65/ref=sr_1_43?dchild=1&keywords=m3+screw+threads&qid=1626014698&sr=8-43
M3 Phillips Screw	1	$7.29	https://www.amazon.com/uxcell-Stainless-Phillips-Machine-Combine/dp/B07P3ZJN2K/ref=sr_1_18?dchild=1&keywords=m3+screws+8mm&qid=1626014873&sr=8-18
M3x8mm Hex Screws	1	$8.49	https://www.amazon.com/uxcell-M3x8mm-Thread-Button-Socket/dp/B01B1OD62C/ref=sr_1_3?dchild=1&keywords=m3+screws+8mm&qid=1626014812&sr=8-3
SanDisk 16GB 3-Pack	1	$17.48	https://www.amazon.com/SanDisk-3-Pack-microSDHC-Memory-3x16GB/dp/B089DPCJS1/ref=sr_1_11?dchild=1&keywords=microSD+Card&qid=1626014929&refinements=p_36%3A1253503011&rnid=386442011&s=pc&sr=1-11

Component locations on PCB

See on Assembly#Component_locations