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{{Note|1='''bcMeter (DIY)''' — This page documents the bill of materials for the source-available bcMeter (DIY) — the Raspberry-Pi-based design, freely available for private, educational and research use (CC BY-NC 4.0). The assembled bcMeter instruments use a different PCB design.}}


== Overview of parts ==
== Overview of Parts (bcMeter DIY) ==
[[File:Overview.jpg|500px|left]]
[[File:1410-diaphragm-pumps-and-compressors.jpg|thumb|none|Stabilized membrane pump]]
<br clear=all>


== Mandatory ==
[[File:bcMeter_parts.jpg|thumb|none|800px]]
1. You need to have a Raspberry Pi Zero W (the W is for "Wireless Lan", there is also a non-W edition). <br/>
2. You need a microSD-Card to copy the Image to<br/>
3. You need a Power Supply or Battery delivering 5V/2A<br/>


== Membrane Pump ==
== Mandatory Components ==
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.<br>
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.


== Download 3D Printable files (A-E) ==
# '''bcMeter Pi Hat''' — Order prepopulated (~95 EUR) or build your own from PCB + components (~5 EUR per PCB for 10+ on JLCPCB or similar)
# '''Raspberry Pi 3A or Zero 2 W''' (~35 EUR)
# '''MicroSD Card''' (~10 EUR)
# '''Power Supply 5.25V/2A''' (~15 EUR)
# '''Air Pump''' (~10–200 EUR depending on type)


STL for 3D Printing (SLA or FDM) [https://github.com/bcmeter/bcmeter/tree/main/stl github repository]  - printing material ~10€<br>
''Prefer not to source parts? bcMeter Kit/Complete available on request — contact jd@bcmeter.org.''


[[File:Bcmeter-general-purpose-case.jpg|500px|left]]<br clear=all>
== 3D Printed Case ==
A-E:
<br>''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<br> - 3D printing service is more expansive (~$100)''<br>


== Download PCB / Gerber Files for bcMeter 12V or 5V (F) ==
STL files for 3D Printing (SLA or FDM): [https://github.com/dahljo/bcmeter/tree/main/stl GitHub repository] — printing material ~10 EUR.
===== We have a small stock of PCBs available, just [https://bcmeter.org/#contact contact] us, if interested. =====


(find gerber files for PCB fabrication on [https://github.com/bcmeter/bcmeter/tree/main/gerbers bcmeter.org]) ~$25 <br>
Use black filament/resin. FDM is prone to leakage if not properly configured. If possible, mix resin with flex resin.


[[File:Bcmeter-tht.jpg|300px|alt=bcMeter general purpose PCB for 12V and large pumps|bcMeter general purpose PCB for 12V and large pumps]]
== Filter Paper ==
bcMeter general purpose PCB for 12V and large pumps


[[File:Bcmeter-smd.jpg|300px|alt=bcMeter SMD PCB for 5V and smaller pumps|bcMeter SMD PCB for 5V and smaller pumps]]
AE33 filter paper is standard for bcMeter. Any filter paper with a known scattering factor can be used. See [[Best practices#Supported Filter Papers|Supported Filter Papers]] for correction factors.
bcMeter SMD PCB for 5V and smaller pumps


== Bill of Material for general purpose PCB (THT components & 12V DC Barrel Jack) (G) ==
Send a sample of your filter paper to jd@bcmeter.org for calibration.


=== [https://www.mouser.de/ProjectManager/ProjectDetail.aspx?AccessID=0f6a28fa20 '''Link to mouser basket'''] '''for one-click-order''' ===
== Additional Material (~75 EUR) ==


{| class="wikitable sortable"
{| class="wikitable"
|+ bcMeter Bill of Materials
! Description !! Quantity !! Approx. Price
| align="center" style="background:#f0f0f0;"|'''Mfr. No'''
| align="center" style="background:#f0f0f0;"|'''Manufacturer'''
| align="center" style="background:#f0f0f0;"|'''Description'''
| align="center" style="background:#f0f0f0;"|'''Order Qty.'''
| align="center" style="background:#f0f0f0;"|'''Price (EUR)'''
| align="center" style="background:#f0f0f0;"|'''Ext.: (EUR)'''
|-
|-
| 110991027||Seeed Studio||Development Boards & Kits - ARM Seeed Rasp Pi Zero W Barebones Kit||1||21,48 €||21,48 €
| 22 AWG Wire || 1 || $10
|-
|-
| MCP3426A6-E/MS||Microchip||Analog to Digital Converters - ADC 16bit deltasigma ADC dual channel 15sps||1||2,35 €||2,35 €
| Hot Glue || 1 || $7
|-
|-
| IRL 81A||Osram Opto Semiconductor||Infrared Emitters Infrared 850nm Half Angle +/-12DEG||2||0,881 €||1,76 €
| Rubber Band (SHORE A) for sealing || 1 || $13
|-
|-
| LPT 80A||Osram Opto Semiconductor||Standard LEDs - SMD PHOTOTRANSISTOR||2||0,762 €||1,52 €
| Silicone Hose (5mm ID) || 1 || $5
|-
|-
| RCER72A103K0K1H03B||Murata||Multilayer Ceramic Capacitors MLCC - Leaded 0.01uF 100volts X7R LS=5mm +/-10%||3||0,474 €||1,42 €
| M3 Screws || 1 set || $7
|-
|-
| TAP334M035SCS||AVX||Tantalum Capacitors - Solid Leaded 35V 0.33uF 20% ESR=1 5 Ohm||2||0,551 €||1,10 €
| M3 Threaded Inserts || 1 set || $7
|-
|-
| CON-SOCJ-2155||Gravitech||DC Power Connectors Power Jack/Connector 2.1mm x 5.5mm||1||1,01 €||1,01 €
| MicroSD Card 16GB || 1 || $8
|-
| K102K15X7RF53H5G||Vishay||Multilayer Ceramic Capacitors MLCC - Leaded 50V 1nF 10% X7R e3 Auto||3||0,313 €||0,94 €
|-
| RDEC71E106K2M1H03A||Murata||Multilayer Ceramic Capacitors MLCC - Leaded 10uF 25volts X7S 10%||1||0,864 €||0,86 €
|-
| RDER71E104K0M1H03A||Murata||Multilayer Ceramic Capacitors MLCC - Leaded 0.1uF 25volts X7R 10 %||2||0,398 €||0,80 €
|-
| L7805CV||STMicroelectronics||Linear Voltage Regulators 5.0V 1.0A Positive||1||0,567 €||0,57 €
|-
| L7809CV||STMicroelectronics||Linear Voltage Regulators 9.0V 1.0A Positive||1||0,415 €||0,42 €
|-
| MMBT3904-G||Comchip Technology||Bipolar Transistors - BJT VCEO=40V IC=200mA||1||0,186 €||0,19 €
|-
| MBA02040C2261FC100||Vishay||Metal Film Resistors - Through Hole .4watt 2.26Kohms 1% 1/8watt body size||2||0,093 €||0,19 €
|-
| CFR25SJT-26-10K||YAGEO||Carbon Film Resistors - Through Hole 10 kOhms 250 mW 5% - 350/ +500 PPM / C||1||0,085 €||0,09 €
|-
| OM1015E-R58||Ohmite||Carbon Film Resistors - Through Hole 100 Ohm 1W 5% 500 Vo lt||1||0,085 €||0,09 €
|-
| ||||||||||
|-
| ||||||||||34,79
|-
|
|}
|}


== Bill of Material for the small PCB (SMD, 5V) (G) ==
== Key PCB Components ==
=== [https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=ce944497d5 '''Link to Mouser Basket'''] '''for one-click-order''' ===


{| class="wikitable collapsible sortable"
{| class="wikitable"
! Mouser No !! Mfr. No !! Manufacturer !! Description !! Order Qty. !! Price (EUR) !! Ext.: (EUR)
! Component !! Description !! Approx. Price
|-
| 603-AC0805JRX7R9BB10 || AC0805JRX7R9BB103 || YAGEO || Multilayer Ceramic Capacitors MLCC - SMD/SMT 50V 0.01uF X7R 0805 5% AEC-Q200 || 3 || 0,26 € || 0,79 €
|-
| 603-CC805KRX7R9BB104 || CC0805KRX7R9BB104 || YAGEO || Multilayer Ceramic Capacitors MLCC - SMD/SMT 50V 0.1uF X7R 0805 10% || 2 || 0,11 € || 0,21 €
|-
| 603-CC805KRX7R9BB102 || CC0805KRX7R9BB102 || YAGEO || Multilayer Ceramic Capacitors MLCC - SMD/SMT 50V 1000pF X7R 0805 10% || 3 || 0,12 € || 0,37 €
|-
| 241-MMBT3904WR100001 || MMBT3904W_R1_00001 || Panjit || Bipolar Transistors - BJT /S1A/TR/7"/HF/3K/SOT-323/TRA/SOT/GPT-02TAN/GPT02-QI01/PJ/// || 1 || 0,14 € || 0,14 €
|-
|-
| 720-IRL81A || IRL 81A || Osram Opto Semiconductor || Infrared Emitters Infrared 850nm Half Angle +/-12DEG || 2 || 0,91 € || 1,82 €
| '''U1''' MCP3428 || 4-Channel ADC || €6
|-
|-
| 720-LPT80A || LPT 80A || Osram Opto Semiconductor || Phototransistors PHOTOTRANSISTOR || 2 || 0,82 € || 1,65 €
| '''D1/D2''' IRL81A || IR LEDs (880nm) || €2
|-
|-
| 474-PRT-14017 || PRT-14017 || SparkFun Electronics || SparkFun Accessories Raspberry Pi GPIO Tall Header - 2x20 || 1 || 1,71 € || 1,71 €
| '''J1''' Omron D6F || Airflow Sensor || €50
|-
|-
| 474-PRT-14275 || PRT-14275 || SparkFun Electronics || SparkFun Accessories Raspberry Pi GPIO Male Header - 2x20 || 1 || 0,83 € || 0,83 €
| '''U2''' LM1117 || Voltage Regulator || €1
|-
|-
| 279-CRGCQ0805F2K2 || CRGCQ0805F2K2 || TE Connectivity || Thick Film Resistors - SMD CRGCQ 0805 2K2 1% SMD Resistor || 2 || 0,23 € || 0,46 €
| '''U3''' SHT4x || Humidity/Temp Sensor || €4
|-
|-
| 279-CRGP0805F100R || CRGP0805F100R || TE Connectivity || Thick Film Resistors - SMD CRGP 0805 100R 1% SMD Resistor || 1 || 0,21 € || 0,21 €
| '''Pump''' D15S PWM || Membrane Pump || €95
|-
|-
| 603-RC0805JR-0710KL || RC0805JR-0710KL || YAGEO || Thick Film Resistors - SMD 10 kOhms 125 mW 0805 5% || 1 || 0,09 € || 0,09 €
| Capacitors, resistors, connectors || Various || ~€20
|-
| 579-MCP3426A2-E/SN || MCP3426A2-E/SN || Microchip || Analog to Digital Converters - ADC 16bit deltasigma ADC dual channel 15sps || 1 || 2,72 € || 2,72 €
|-
| 571-9-146274-0 || 9-146274-0 || TE Connectivity || Headers & Wire Housings 40P MODII .100CL HDR || 1 || 2,95 € || 2,95 €
|-
| 963-LMR212BD7106KG-T || LMR212BD7106KG-T || Taiyo Yuden || Multilayer Ceramic Capacitors MLCC - SMD/SMT 0805 10VDC 10uF 10% X7T AEC-Q200 || 1 || 0,37 € || 0,37 €
|-
| TOTAL ||  || || ||  || 11,469 || 14,32 €
|}
|}
== 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. <br><br>


We're testing the better available https://www.amazon.com/7194-Non-Heat-Pallflex-Tissuquartz-Laboratory/dp/B0731SG18R. <br>
Full BOM with exact product numbers available at [https://github.com/dahljo/bcmeter GitHub].
Or you may send us a sample of your filter paper and we happily calibrate bcMeter with it!<br>
 
== PCB / Gerber Files ==
 
Gerber files for PCB fabrication: [https://github.com/dahljo/bcmeter/tree/main/gerbers GitHub]
 
Two PCB variants exist:
* '''SMD PCB''' — For 5V and smaller pumps. More compact, recommended.
* '''THT PCB''' — For 12V and larger pumps. Easier to assemble but less accurate.


== Assembled instruments (Kit/Complete) ==


== Amazon Links for additional Material (I) ==
The assembled bcMeter instruments use a different hardware design:


{| {{table}}
* '''ADS1220''' 24-bit ADC (replaces MCP3428)
| align="center" style="background:#f0f0f0;"|'''Description'''
* '''Integrated microcontroller''' (instead of the Raspberry Pi used in the DIY build)
| align="center" style="background:#f0f0f0;"|'''Quantity'''
* '''Internal flash storage''' (replaces microSD)
| align="center" style="background:#f0f0f0;"|'''Price'''
* '''Optional:''' SIM7080G LTE-M modem, AT6668 GPS, SPS30 PM sensor
| align="center" style="background:#f0f0f0;"|'''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 ==
For current device information, see [[Introduction]].
See on [[Assembly#Component_locations|Assembly#Component_locations]]

Latest revision as of 01:45, 1 August 2026

Template:Note

Overview of Parts (bcMeter DIY)

Mandatory Components

  1. bcMeter Pi Hat — Order prepopulated (~95 EUR) or build your own from PCB + components (~5 EUR per PCB for 10+ on JLCPCB or similar)
  2. Raspberry Pi 3A or Zero 2 W (~35 EUR)
  3. MicroSD Card (~10 EUR)
  4. Power Supply 5.25V/2A (~15 EUR)
  5. Air Pump (~10–200 EUR depending on type)

Prefer not to source parts? bcMeter Kit/Complete available on request — contact jd@bcmeter.org.

3D Printed Case

STL files for 3D Printing (SLA or FDM): GitHub repository — printing material ~10 EUR.

Use black filament/resin. FDM is prone to leakage if not properly configured. If possible, mix resin with flex resin.

Filter Paper

AE33 filter paper is standard for bcMeter. Any filter paper with a known scattering factor can be used. See Supported Filter Papers for correction factors.

Send a sample of your filter paper to jd@bcmeter.org for calibration.

Additional Material (~75 EUR)

Description Quantity Approx. Price
22 AWG Wire 1 $10
Hot Glue 1 $7
Rubber Band (SHORE A) for sealing 1 $13
Silicone Hose (5mm ID) 1 $5
M3 Screws 1 set $7
M3 Threaded Inserts 1 set $7
MicroSD Card 16GB 1 $8

Key PCB Components

Component Description Approx. Price
U1 MCP3428 4-Channel ADC €6
D1/D2 IRL81A IR LEDs (880nm) €2
J1 Omron D6F Airflow Sensor €50
U2 LM1117 Voltage Regulator €1
U3 SHT4x Humidity/Temp Sensor €4
Pump D15S PWM Membrane Pump €95
Capacitors, resistors, connectors Various ~€20

Full BOM with exact product numbers available at GitHub.

PCB / Gerber Files

Gerber files for PCB fabrication: GitHub

Two PCB variants exist:

  • SMD PCB — For 5V and smaller pumps. More compact, recommended.
  • THT PCB — For 12V and larger pumps. Easier to assemble but less accurate.

Assembled instruments (Kit/Complete)

The assembled bcMeter instruments use a different hardware design:

  • ADS1220 24-bit ADC (replaces MCP3428)
  • Integrated microcontroller (instead of the Raspberry Pi used in the DIY build)
  • Internal flash storage (replaces microSD)
  • Optional: SIM7080G LTE-M modem, AT6668 GPS, SPS30 PM sensor

For current device information, see Introduction.

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