HardLabs

Diy watch

elsw·diy_watch·PCB/diy_watch/diy_watch.kicad_pcb

Diy watch PCB layout, top view — open source RP2040/RP2350 board by elsw

About the Diy watch PCB

Diy watch is an open source RP2040/RP2350 PCB design by elsw, published on GitHub. It is a 4-layer board measuring 37.1 × 37 mm, with 43 components from 24 distinct parts.

Its main chip is the DS3231MZ, from the RP2040/RP2350 family. Other key parts include the W25Q16JVUXIQ, FTE-2CA-V-T/R, RP2040, XC6210B332MR and ltc4071ems8e#pbf. By type, the board carries 18 resistors, 11 capacitors, 7 ICs, 2 diodes, 1 crystal and 1 connector.

It belongs with the wearables, power & battery and displays & leds designs in this gallery.

From the project

This is a project to create a homecrew binary watch to fit inside a analogue wrist watch

This is a project to create a homecrew binary watch to fit inside a analogue wrist watch

- No Vcc out of the LTC4071 chip, swapped LBSEL to set the Low Battery Connect to 3.6V but never get any voltage out. Change to MCP73833? also cheaper. reference curcuit - Cannot debug RP2040 code, got it working once but not again, I think it's something up with the cdoe itself, debugging reliable blink code though... (change to pico 2??) (try embassy???)

Main components on the Diy watch

W25Q16JVUXIQFTE-2CA-V-T/RDS3231MZRP2040XC6210B332MRltc4071ems8e#pbf

Diy watch bill of materials (BOM)

43 components, 24 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
W25Q16JVUXIQ
IC1
1
FTE-2CA-V-T/R
U1
1
DS3231MZ
U2
1
RP2040
U3
1
~
U4
1
XC6210B332MR
U7
1
ltc4071ems8e#pbf
LTC4071EMS8E_PBF
U8
1
12MHZ_CRYSTAL
12MHz_crystal
Y1
1
USB_B_Micro
J1
1
Battery_Cell
BT1
1
SolderJumper_3_Bridged12
JP1
1
SW_Push
SW1
2
LED
D1, D2
8
1UF
1uF
C1, C4, C5, C6, C7, C8, C9, C11
2
20PF
20pF
C2, C3
1
1uF
C10
1
1k
R1
3
10K
R2, R15, R17
8
5K
R3, R4, R5, R6, R7, R8, R9, R10
1
100K
R11
Show 4 more
QtyPartRefs
1
300
R12
1
300
R13
1
162
R16
2
27R
R18, R19

Diy watch design files

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

Diy watch: common questions

What microcontroller does the Diy watch use?

The Diy watch is built around the DS3231MZ, from the RP2040/RP2350 family.

How big is the Diy watch PCB?

The Diy watch measures 37.1 × 37 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Diy watch?

43 components, from 24 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 Diy watch design files?

From the elsw/diy_watch 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 Diy watch design in my own project?

The repository has no license, so all rights stay with elsw. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Diy watch without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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