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4 layers78 × 56 mmAlakol, the printed circuit board in 3D

A specialised datalogger for superpressure balloon manufacturing

Size
78 × 56 mm
Copper layers
4
Thickness
1.6 mm
Parts
118
Nets
105
Pads
465
Tracks, vias
849, 157
Pours
9
Routed
Yes
KiCad
KiCad 5 (file 20171130)
Created
18 Apr 2020
Updated
8 Dec 2022

Overview

Alakol is an open-source printed circuit board by richardeoin, from the richardeoin/alakol repository on GitHub. It is a 4-layer board of 78 × 56 mm with 118 parts on 105 nets, routed with 849 tracks and 157 vias.

It is built around the STM32H743VIT6, LTC2064IMS8#PBF and AD8226BRZ, with the 2SMPP-02, MS560702BA03-50 and REF3325AIDCK among its other parts. Its parts include 46 resistors, 37 capacitors, 9 ICs, 6 diodes and 5 connectors. It belongs with the sensors and measurement boards and the STM32 boards of this library.

Main components

12

README

hardware/README.md

Alakol hardware

Replacement control board for the Omron M2

PCB Front Photo


Hardware Overview

Schematic

  • Omron 2SMPP-02 gauge pressure sensor
    • Resistive wheatstone bridge
    • TI REF3325 + LTC2064 to provide constant current source
    • AD8226 In-Amp
  • MS5607 Sensor
    • Ambient Pressure
    • Board Temperature (close to 2SMPP-02)
  • K-Type Thermocouple (Al/Ch)
    • AD8226 In-Amp
  • Microcontroller
    • STM32H743VIT6
    • KSZ8081RN Ethernet PHY
  • DC Power Jack
    • Centre +ve
    • 4.6V - 18V
    • Or 4xAA batteries!
  • Fits in existing Omron M2 housing
    • Dimensions: 78.0mm x 56.0mm (3.07" x 2.20")
Schematicsvg/pdf
BOMcsv
Layoutsvg/pdf/dxf
Gerbersgerbers

PCB Back Photo

License

Hardware is licensed under CERN OHL v1.2. See LICENSE.md

Parts

118
QtyValueFootprintReferences
15100nFagg:0402C2, C4, C10, C14, C15, C19, C20, C22, C24, C28, C29, C30, C32, C35, C36
1210kΩagg:0402R14, R15, R16, R17, R18, R19, R20, R23, R34, R37, R38, R46
72.2µFagg:0603C5, C17, C18, C21, C23, C25, C33
722Ωagg:0402R21, R22, R24, R25, R26, R27, R28
61kΩagg:0402R6, R29, R32, R33, R36, R41
510kΩ 1%agg:0402R4, R10, R12, R40, R43
410nFagg:0402C6, C12, C13, C34
41nF 5%agg:0402C1, C11, C31, C37
4BLM15EG221SNagg:0402FB1, FB2, FB3, FB4
310kΩ 0.1%agg:0402R1, R3, R11
3330Ωagg:0402R2, R31, R35
2100kΩagg:0402R5, R39
2100Ωagg:0402R8, R42
210µFagg:0603C7, C8
218pFagg:0402C26, C27
21µFagg:0402C3, C9
2AD8226agg:MSOP-8U3, U6
2PARTrem:drillX1, X4
2SM4007PL-TPDiode_SMD:D_SOD-123FD5, D6
2SWITCH_DPSTrem:SW_PUSH-12mm-OMRON_4xxx_5xxxSW2, SW3
108B0-1X1T-06-Frem:08B0-1X1T-06-FJ2
10Ωagg:0402R45
1100pFagg:0402C16
11MΩagg:0402R44
12.6kΩagg:0402R7
125MHzagg:XTAL-50x32Y2
127kΩ 1%agg:0402R9
12SMPP-02rem:2SMPP-02U5
16.8kΩ 1%agg:0402R13
16k49Ωagg:0402R30
1BC817agg:SOT-23Q1
1BSS138BKagg:SOT-23Q2
1Barrel_Jack_SwitchConnector_BarrelJack:BarrelJack_CUI_PJ-102AH_HorizontalJ4
1CONN_01x08agg:SIL-254P-08J1
1DSC6083rem:XTAL-32x25-CDFN4Y1
1K Typerem:PCC-SMPTC1
1KSZ8081RNxagg:QFN-24-EP-MICRELIC1
1LED-blueagg:0603-LEDD3
1LED-orangeagg:0603-LEDD2
1LED-redagg:0603-LEDD1
1LTC2064IMS8agg:MSOP-8U1
1MS5607-02BA03agg:MS5611IC3
1NCP1117-3.3_SOT223Package_TO_SOT_SMD:SOT-223-3_TabPin2U2
1RB160MM-60TRDiode_SMD:D_SOD-123D4
1REF3325AIDCKagg:SOT-323U4
1Rotary_Encoderrem:PEC11R-4xxxF-NxxxxSW1
1SMD_XTAL_38.4_MHzagg:XTAL-25x20Y3
1STM32H743VIT6agg:LQFP-100IC2
1SWDrem:FTSH-105-01-L-DV-K-ANCHORP1
1Side PCBrem:Omron_Playbook_FootprintJ3

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Questions

How big is the Alakol PCB?

It measures 78 × 56 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Alakol use?

118 parts, built around the STM32H743VIT6, LTC2064IMS8#PBF, AD8226BRZ and 2SMPP-02. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Alakol KiCad files?

From the richardeoin/alakol repository on GitHub, at the commit this page was made from: the board is hardware/alakol.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Alakol design in my own project?

Its repository states no licence, so its author keeps all rights: ask richardeoin before reusing the design.