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Thomas van Pul

Open hardware · March 2026 onward

BlueBand

A modular open-hardware sports wristband, runner-up at the upLYFT Wearable Tech Hackathon at Imperial.

blueband-concept ↗
A 3D view of the two-layer ESP32-S3 board from KiCad
The board, a two-layer ESP32-S3 design I routed in KiCad.
The same board from above, with the parts labelled by designator
From above: U3 is the ESP32-S3 module, U2 the MPU-6050.

01 / 03

The board

35.5 × 42.125 mmthe board outline, 1.6 mm FR4.

Since the hackathon I designed and routed its two-layer ESP32-S3 board in KiCad and had it made.

U3
ESP32-S3-WROOM-1
U2
MPU-6050
U4
TP4056, ESOP-8
U5
AP2112K-3.3
U1
USBLC6-2SC6
J1
USB-C, HRO TYPE-C-31-M-12

02 / 03

The enclosure

40.5 × 47.125 × 16.5 mmoutside, as modelled.

The enclosure is a parametric CadQuery model. Every build checks its minimum wall by measuring the exact distance between the inner and outer shells.

03 / 03

What runs today

The working hardware is still a dev board and an MPU-6050 on an elastic band.