HardLabs

Bloodlight hardware

CodethinkLabs·bloodlight-hardware·hardware/bloodlight.kicad_pcb

Bloodlight hardware PCB layout, top view — open source STM32 board by CodethinkLabs
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About the Bloodlight hardware PCB

Bloodlight hardware is an open source STM32 PCB design by CodethinkLabs, published on GitHub under the CERN-OHL-P-2.0 license. It is a 4-layer board measuring 28 × 78 mm, with 96 components from 54 distinct parts.

Its main chip is the STM32G474CBxx, from the STM32 family. Other key parts include the AD8605, ULN2803A, TPS73433DDCR, LM4132 and USBLC6-2SC6. By type, the board carries 35 capacitors, 23 resistors, 20 LEDs, 10 ICs, 3 connectors and 3 inductors.

From the project

Medical PPG Testbed Hardware

This is a test-bed for medical photoplethysmography (PPG).

The current design has 16 LED's and 4 Photodiodes covering multiple wavelengths between visible light and near infrared (roughly 400nm-1600nm).

You'll need KiCad 5 to view or modify the schematics/pcb. For Ubuntu users I'd suggest using this PPA:

If you wish to modify the schematics then you should install the latest symbols, footprints and 3D models from git.

Main components on the Bloodlight hardware

AD8605ULN2803ATPS73433DDCRLM4132USBLC6-2SC6STM32G474CBxx

Bloodlight hardware bill of materials (BOM)

96 components, 54 distinct parts — part numbers from the project's BOM.

QtyPartRefs
4
AD8605
U1, U2, U3, U4
2
ULN2803A
U5, U6
1
TPS73433DDCR
U7
1
LM4132
U8
1
USBLC6-2SC6
U9
1
STM32G474CBxx
U10
1
16MHz/8pF
X1
1
USB_B_Micro
J1
1
Debug
J2
1
EXT
J3
1
570nm
PD1
1
20mA/1.45V
LD1
1
20mA/1.3V
LD2
1
20mA/1.2V
LD3
1
50mA/1.3V
LD4
4
20mA/1V
LD5, LD6, LD7, LD8
1
20mA/1.7V
LD9
1
20mA/1.8V
LD10
1
20mA/2.1V
LD11
1
20mA/2V
LD12
Show 34 more
QtyPartRefs
1
20mA/2V
LD13
1
20mA/2.1V
LD14
1
20mA/3.2V
LD15
1
20mA/3.3V
LD16
1
4mA/1.85V
LD17
1
820nm
PD2
1
940nm
PD3
1
1580nm
PD4
3
1.5A/22R
FB1, FB2, FB3
3
10pF/50V
C1, C2, C3
1
10pF/50
C4
2
6pF/50V
C5, C6
3
10nF/50V
C7, C8, C25
16
100nF/16V
C9, C10, C11, C12, C13, C14, C21, C22 +8
6
1uF/16V
C15, C16, C17, C19, C26, C35
1
2.2uF/16V
C18
1
4.7uF/16V
C20
2
22uF/16V
C27, C28
1
560k/1%
R1
1
1.2M/1%
R2
1
2M/1%
R3
1
1.8M/1%
R4
2
130/1%
R5, R13
4
56/1%
R6, R8, R19, R20
1
68/1%
R7
2
165/1%
R9, R12
2
75/1%
R10, R11
1
33/1%
R14
1
22/1%
R15
1
120/1%
R16
2
27/1%
R17, R18
1
390/1%
R22
1
56k/1%
R25
1
27k/1%
R26

Bloodlight hardware design files

The KiCad project lives in the CodethinkLabs/bloodlight-hardware repository on GitHub; these links point at the commit this page was built from.

Bloodlight hardware: common questions

What microcontroller does the Bloodlight hardware use?

The Bloodlight hardware is built around the STM32G474CBxx, from the STM32 family.

How big is the Bloodlight hardware PCB?

The Bloodlight hardware measures 28 × 78 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Bloodlight hardware?

96 components, from 54 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Bloodlight hardware design files?

From the CodethinkLabs/bloodlight-hardware repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Bloodlight hardware design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which CodethinkLabs chose for the repository.

Can I test firmware for the Bloodlight hardware without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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