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2 layers102.5 × 62 mmOxygen Monitoring, the printed circuit board in 3D

This was my second year project as an electrical engineering student, and it was quite difficult because it used an STM32 controller, which I was not familiar with. The project was also considered a failure because it did not produce any final product, only electrical designs and simulations.

Size
102.5 × 62 mm
Copper layers
2
Thickness
1.6 mm
Parts
121
Nets
108
Pads
447
Tracks, vias
1,261, 114
Pours
2
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
1 Sep 2025
Updated
2 Sep 2025

Overview

Oxygen Monitoring is an open-source printed circuit board by mosyrf, from the mosyrf/Oxygen-Monitoring-System repository on GitHub. It is a 2-layer board of 102.5 × 62 mm with 121 parts on 108 nets, routed with 1,261 tracks and 114 vias.

It is built around the MAX485ED, LM2596S-5.0 and 74HC14, with the RT9193-33GB, SRV05-4 and W5100 among its other parts. Its parts include 45 capacitors, 34 resistors, 13 diodes, 7 ICs and 5 connectors. It belongs with the STM32 boards of this library.

Main components

7

README

README.md

Oxygen-Monitoring-System

This was my second year project as an electrical engineering student, and it was quite difficult because it used an STM32 controller, which I was not familiar with. The project was also considered a failure because it did not produce any final product, only electrical designs and simulations.

Parts

121
QtyValueFootprintReferences
27100nFCapacitor_SMD:C_0805_2012MetricC2, C15, C16, C19, C20, C21, C22, C24, C25, C26, C27, C28, C34, C35, C36, C37 +11
10LEDLED_SMD:LED_0805_2012MetricD2, D3, D4, D5, D8, D9, D10, D11, D12, D13
91K4Resistor_SMD:R_0805_2012MetricR3, R19, R20, R21, R22, R23, R24, R25, R26
74K7Resistor_SMD:R_0805_2012MetricR8, R10, R12, R13, R15, R33, R34
649R9Resistor_SMD:R_0805_2012MetricR27, R28, R29, R30, R31, R32
51uFCapacitor_SMD:C_0805_2012MetricC5, C8, C10, C17, C18
4MountingHole_PadMountingHole:MountingHole_3mm_Pad_ViaH1, H2, H3, H4
4TestPointConnector_Wire:SolderWirePad_1x01_SMD_1x2mmTP1, TP2, TP3, TP4
32K4Resistor_SMD:R_0805_2012MetricR1, R7, R9
2100KResistor_SMD:R_0805_2012MetricR5, R6
213pFCapacitor_SMD:C_0805_2012MetricC29, C30
215pFCapacitor_SMD:C_0805_2012MetricC13, C14
21MResistor_SMD:R_0805_2012MetricR4, R18
222nFCapacitor_SMD:C_0805_2012MetricC7, C23
222pFCapacitor_SMD:C_0805_2012MetricC11, C12
23.3uF/16VCapacitor_THT:CP_Radial_D4.0mm_P2.00mmC31, C32
2PolyfuseFuse:Fuse_Littelfuse_395SeriesF1, F2
110KResistor_SMD:R_0805_2012MetricR2
110uF/16VCapacitor_THT:CP_Radial_D5.0mm_P2.00mmC33
1120Resistor_SMD:R_0805_2012MetricR14
1120RInductor_SMD:L_0805_2012MetricFB1
112KResistor_SMD:R_0805_2012MetricR16
11N4148WDiode_SMD:D_SOD-123D6
11N5822Diode_THT:D_DO-201AD_P12.70mm_HorizontalD1
11uH/250mAInductor_SMD:L_0805_2012MetricL2
125MHzCrystal:Crystal_HC49-U_VerticalY3
1270uF/35VCapacitor_THT:CP_Radial_D8.0mm_P5.00mmC3
1300Resistor_SMD:R_0805_2012MetricR17
132.768KHzCrystal:Crystal_SMD_SeikoEpson_MC156-4Pin_7.1x2.5mm_HandSolderingY2
1470uF/50VCapacitor_THT:CP_Radial_D10.0mm_P7.50mmC1
147uHInductor_SMD:L_12x12mm_H4.5mmL1
156KResistor_SMD:R_0805_2012MetricR11
174HC14Package_DIP:DIP-14_W7.62mm_SMDSocket_SmallPadsU4
18MHzCrystal:Crystal_HC49-U_VerticalY1
18P8C_LED_ShieldedConnector_RJ:RJ45_Cetus_J1B1211CCD_HorizontalJ5
1BOOT MODEConnector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_VerticalJ2
1LM2596S-5Package_TO_SOT_SMD:TO-263-5_TabPin3U1
1MAX485EPackage_DIP:DIP-8_W7.62mm_SMDSocket_SmallPadsU5
1Modbus-485TerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-3-5.0-H_1x03_P5.00mm_HorizontalJ4
1PWR-INTerminalBlock_Phoenix:TerminalBlock_Phoenix_PT-1,5-2-5.0-H_1x02_P5.00mm_HorizontalJ1
1RT9193-33GBPackage_TO_SOT_SMD:SOT94P279X129-5NU2
1SM712_SOT23Package_TO_SOT_SMD:SOT-23D7
1SRV05-4Package_TO_SOT_SMD:SOT-23-6U7
1ST-LINK PROGRAMMERConnector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_VerticalJ3
1STM32F103C8TxPackage_QFP:LQFP-48_7x7mm_P0.5mmU3
1SW_PushButton_Switch_SMD:SW_SPST_CK_RS282G05A3SW1
1W5100Package_QFP:LQFP-80_10x10mm_P0.4mmU6

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Questions

How big is the Oxygen Monitoring PCB?

It measures 102.5 × 62 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Oxygen Monitoring use?

121 parts, built around the MAX485ED, LM2596S-5.0, 74HC14 and RT9193-33GB. 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 Oxygen Monitoring KiCad files?

From the mosyrf/Oxygen-Monitoring-System repository on GitHub, at the commit this page was made from: the board is PCB Design/Oxygen Monitoring (W5100)/Oxygen Monitoring.kicad_pcb and its schematic PCB Design/Oxygen Monitoring (W5100)/Oxygen Monitoring.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Oxygen Monitoring design in my own project?

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