HardLabs

OpenBand

chancehowarth33·OpenBand·pcb/watchwise_main_kicad/watchwise_main.kicad_pcb

OpenBand PCB layout, top view — open source board by chancehowarth33
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About the OpenBand PCB

OpenBand is an open source PCB design by chancehowarth33, published on GitHub under the MIT license. It is a 2-layer board measuring 36 × 33.9 mm, with 32 components from 22 distinct parts.

Other key parts include the BMI270, MAX30102EFD_T, CYBLE-416045-02, MCP73831-2-OT and TLV70018_SOT353. By type, the board carries 14 capacitors, 5 ICs, 4 resistors and 2 LEDs.

It belongs with the wearables, sensors and iot & wireless designs in this gallery.

From the project

Starter directory for wearable tech health tracking device

I wanted to know whether I could build a real consumer wearable end to end, by myself, rather than wiring a dev board to a breakout sensor and calling it a project. That means every layer: schematic capture, a two-layer board with an RF section that actually works, hand assembly, bare-metal bring-up, an RTOS, sensor drivers written against datasheets, the signal processing that turns raw photodiode counts into a heart rate, a Bluetooth GATT server, a printed enclosure, and a native phone app to display it all.

OpenBand, from the project README
From the project README

Main components on the OpenBand

BMI270MAX30102EFD_TCYBLE-416045-02MCP73831-2-OTTLV70018_SOT353

OpenBand bill of materials (BOM)

32 components, 22 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
BMI270
U1_IMU1
1
MAX30102EFD_T
U2_MAX1
1
CYBLE-416045-02
U3_CYBLE1
1
MCP73831-2-OT
U4_CHAR1
1
TLV70018_SOT353
U5_1P8
1
Prog
JPROG1
1
100K
100k
RD1
1
220K
220k
RD2
1
0.47K
0.47k
RLED1
1
32.768KHZ
RTC1
1
47k
R_PROG1
1
10k
R_PWR1
2
LED
P_BATT1, P_CHAR1
5
0.1UF
0.1uF
C1, C2, C4, C6, C10
1
4.7UF
4.7uF
C3
1
10UF
10uF
C5
2
6PF
6pF
C7, C8
1
10UF
10uF
C9
2
1UF
1uF
C11, C12
2
4.7UF
4.7uF
C13, C14
Show 2 more
QtyPartRefs
3
4.7K
4.7k
R1, R2, R3
1
10K
10k
R4

OpenBand design files

The KiCad project lives in the chancehowarth33/OpenBand repository on GitHub; these links point at the commit this page was built from.

OpenBand: common questions

How big is the OpenBand PCB?

The OpenBand measures 36 × 33.9 mm, has 2 copper layers and is 0.41116 mm thick.

How many components are on the OpenBand?

32 components, from 22 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 OpenBand design files?

From the chancehowarth33/OpenBand repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the OpenBand design in my own project?

Yes, under the terms of its MIT license, which chancehowarth33 chose for the repository.

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