Watch
About the Watch PCB
Watch is an open source STM32 PCB design by sulkith, published on GitHub under the MIT license. It is a 2-layer board measuring 31 × 31 mm, with 43 components from 17 distinct parts.
Its main chip is the STM32L432KBUx, from the STM32 family. Other key parts include the BMA456, TPS62203DBV and LTC4124. By type, the board carries 17 diodes, 8 connectors, 5 capacitors, 5 resistors, 4 ICs and 2 inductors.
It belongs with the wearables designs in this gallery.
From the project
WristWatch
Main components on the Watch
Watch bill of materials (BOM)
43 components, 17 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | BMA456 | BMA456 | IC1 |
| 1 | STM32L432KBUx | QFN-32-1EP_5x5mm_P0.5mm_EP3.65x3.65mm | U1 |
| 1 | TPS62203DBV | SOT-23-5 | U2 |
| 1 | LTC4124 | Analog_LQFN12_LTC4124 | U4 |
| 1 | Crystal | Crystal_SMD_2012-2pin_2.0x1.2mm_HandSoldering | Y1 |
| 1 | Conn_01x10 | TE_1-1734839-0_1x10-1MP_P0.5mm_Horizontal | J1 |
| 5 | Conn_01x01 | TestPoint | J2, J3, J4, J5, J6 |
| 2 | Conn_01x01_Male | SolderPad | J7, J8 |
| 1 | Battery_Cell | solderPad_small | BT1 |
| 16 | LED | LED_0603 | D1, D2, D3, D4, D5, D6, D7, D8 +8 |
| 1 | LED | LED_0603_1608Metric | D17 |
| 1 | L | L_0603_1608Metric_Pad1.05x0.95mm_HandSolder | L1 |
| 1 | 12,6µH | solderPad_small | L2 |
| 4 | C | C_0603_HandSoldering | C1, C2, C5, C6 |
| 1 | 47nF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C4 |
| 4 | R | R_0603 | R1, R2, R3, R4 |
| 1 | R | R_0603_1608Metric | R5 |
Watch design files
The KiCad project lives in the sulkith/BCDWristWatch repository on GitHub; these links point at the commit this page was built from.
Watch: common questions
What microcontroller does the Watch use?
The Watch is built around the STM32L432KBUx, from the STM32 family.
How big is the Watch PCB?
The Watch measures 31 × 31 mm, has 2 copper layers and is 1 mm thick.
How many components are on the Watch?
43 components, from 17 distinct parts. The full bill of materials is listed on this page.
Where can I download the Watch design files?
From the sulkith/BCDWristWatch repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Watch design in my own project?
Yes, under the terms of its MIT license, which sulkith chose for the repository.
Can I test firmware for the Watch 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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