Assembly

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Overview of parts

Overview.jpg


Requirements:

  1. Screwdriver
  2. Solder Iron
  3. Solder
  4. Flux
  5. 3D Printer / 3d printing service
  6. bcMeter Parts

Walkthrough

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Time lapse of assembly

This guide is for the general purpose 12V PCB which was designed for simplicity so as little as possible SMD components and parts with large footprints are used.



1. Start assembling by soldering the smallest parts first (MMBT3904 + MCP3426).

  • BcMeter-assembly0000.jpg
  • BcMeter-assembly0001.jpg


2. Then add THT passive parts piece by piece, the Pi Header (or connector) according to description on the PCB and the BOM.

  • BcMeter-assembly0002.jpg
  • BcMeter-assembly0003.jpg
  • BcMeter-assembly0004.jpg
  • BcMeter-assembly0005.jpg


3. Put IRL81A (IR Emitter) and LPT80A (Sensor) in brackets D and E - refer to overview above - seal with hot glue and solder wires to the corresponding vias on the PCB. Long leg is anode (positive).

  • BcMeter-assembly0006.jpg
  • BcMeter-assembly0007.jpg
  • BcMeter-assembly0008.jpg
  • Sensor-emitter-brackets.jpg
  • BcMeter-assembly0009.jpg

4. Place adapters D and E (refer to overview above) in the case A and B. Emitter to top case. Seal with (hot) glue or tape.

  • BcMeter-assembly0016.jpg
  • Brackets-in-lower-case.jpg


5. Put pump in place and do a test run for leakage.

  • Pump.jpg
  • BcMeter-assembly0015.jpg


6. Secure the raspberry with 3d printed brackts

  • BcMeter-assembly0018.jpg
  • BcMeter-assembly0020.jpg


7. Put the rubber band (cut down to two peaces or use one) to prevent air leaks onto lower case, also add screw threads if you want to.

  • BcMeter-assembly0012.jpg
  • BcMeter-assembly0013.jpg
  • BcMeter-assembly0022.jpg


8. Put filter paper on top of the rubber, screw the intake part on top and continue with software configuration.

  • BcMeter-assembly0021.jpg
  • BcMeter-assembly0023.jpg


BOM / Component locations

Ref Value Part Footprint Description Vendor
C1 330nF Device:CP Capacitor_THT:CP_Radial_D5.0mm_P2.50mm Polarized capacitor
C2 100nF Device:C Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm Unpolarized capacitor
C3 330nF Device:CP Capacitor_THT:CP_Radial_D5.0mm_P2.50mm Polarized capacitor
C4 100nF Device:C Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm Unpolarized capacitor
C5 10nF Device:C Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm Unpolarized capacitor
C6 1nF Device:C Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm Unpolarized capacitor
C7 10uF Device:CP Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm Polarized capacitor
C8 100nF Device:C Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm Unpolarized capacitor
C9 10nF Device:C Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm Unpolarized capacitor
C10 1nF Device:C Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm Unpolarized capacitor
C11 10nF Device:C Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm Unpolarized capacitor
C12 1nF Device:C Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm Unpolarized capacitor
D1 IRL81A Device:LED LED_THT:LED_SideEmitter_Rectangular_W4.5mm_H1.6mm Light emitting diode
D2 IRL81A Device:LED LED_THT:LED_SideEmitter_Rectangular_W4.5mm_H1.6mm Light emitting diode
J1 Jack-DC Connector:Jack-DC Connector_BarrelJack:BarrelJack_Wuerth_6941xx301002 DC Barrel Jack
J2 Raspberry_Pi_2_3 Connector:Raspberry_Pi_2_3 Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical expansion header for Raspberry Pi 2 & 3
J3 Conn_02x13_Odd_Even Connector_Generic:Conn_02x13_Odd_Even Connector_PinHeader_2.54mm:PinHeader_2x13_P2.54mm_Vertical Generic connector, double row, 02x13, odd/even pin numbering scheme (row 1 odd numbers, row 2 even numbers), script generated (kicad-library-utils/schlib/autogen/connector/)
J4 RTC Connector_Generic:Conn_01x05 Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical Generic connector, single row, 01x05, script generated (kicad-library-utils/schlib/autogen/connector/)
J5 TMP Connector_Generic:Conn_01x04 Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical Generic connector, single row, 01x04, script generated (kicad-library-utils/schlib/autogen/connector/)
M1 12V Pump Motor:Fan_CPU_4pin Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical CPU Fan, tacho output, PWM input, 4-pin connector
M2 AirflowMeter Motor:Fan_Tacho_PWM Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical Fan, tacho output, PWM input, 4-pin connector
Q1 LPT80A Sensor_Optical:LPT80A OptoDevice:Osram_LPT80A NPN phototransistor
Q2 MMBT3904 Transistor_BJT:MMBT3904 Package_TO_SOT_SMD:SOT-23 0.2A Ic, 40V Vce, Small Signal NPN Transistor, SOT-23
Q3 LPT80A Sensor_Optical:LPT80A OptoDevice:Osram_LPT80A NPN phototransistor
R1 2k2 Device:R Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal Resistor
R2 100 Device:R Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal Resistor
R3 2k2 Device:R Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal Resistor
R4 10k Device:R Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal Resistor
RV1 R_POT Device:R_POT Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical Potentiometer
SW1 Interrupt Switch:SW_Push_Open Connector_PinHeader_2.54mm:PinHeader_2x01_P2.54mm_Vertical Push button switch, push-to-open, generic, two pins
U1 L7809 Regulator_Linear:L7809 Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical Positive 1.5A 35V Linear Regulator, Fixed Output 9V, TO-220/TO-263/TO-252
U2 L7805 Regulator_Linear:L7805 Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical Positive 1.5A 35V Linear Regulator, Fixed Output 5V, TO-220/TO-263/TO-252
U3 MCP3426-xMS Analog_ADC:MCP3426-xMS Package_SO:MSOP-8_3x3mm_P0.65mm 16-Bit, Multi-Channel ΔΣ Analog-to-Digital Converter with I2C Interface and On-Board Reference, MSOP-8
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