Watch logic
About the Watch logic PCB
Watch logic is an open source PCB design by jeffc, published on GitHub. It is a 2-layer board measuring 25.4 × 25.4 mm, with 27 components from 18 distinct parts.
Other key parts include the 113990582, M41T62LC6F and W25X20CLUXIG. By type, the board carries 10 resistors, 6 connectors, 3 ICs, 2 transistors, 2 capacitors and 1 crystal.
It belongs with the wearables, power & battery and displays & leds designs in this gallery.
From the project
obsolete repository - see https://github.com/jeffc/nrf52-watch-firmware
This repo is, at present, a work-in-progress playground for designing and building a smartwatch based on the nrf52840 microcontroller from Nordic.
RayTac MDBT50Q nRF52840 Module Main brains. nRF52840 chipset chosen for BLE capability and low (<1uA) sleep current. This is the module used in the Sparkfun Breakout Sharp LS018B7DH02 1.8" Memory LCD with FLExLight Frontlight Always-on display. Chosen for size and small power consumption. The LS018B7DH02 isn't sold directly by Sharp, and no datasheet is currently available. Unknowns are currently Does the display require 3.3V or 5V power? Does…
Main components on the Watch logic
Watch logic bill of materials (BOM)
27 components, 18 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 113990582 | 113990582 | IC1 |
| 1 | M41T62LC6F | LCC90P230X50X80-8N | IC2 |
| 1 | W25X20CLUXIG | 8-USON | U1 |
| 2 | DMN6140L | SOT-23 | Q1, Q2 |
| 1 | Crystal | Crystal_SMD_2012-2Pin_2.0x1.2mm_HandSoldering | Y1 |
| 2 | Conn_01x04_Female | JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J1, J2 |
| 1 | Buzzer | PinHeader_1x02_P1.00mm_Vertical | J3 |
| 1 | Memory LCD | Hirose_FH12-10S-0.5SH_1x10-1MP_P0.50mm_Horizontal | J4 |
| 1 | Conn_01x04_Female | MOLEX_503480-0400 | J5 |
| 1 | AXT610124 | PANASONIC_AXT610124 | P1 |
| 2 | SW_Push | SW_SPST_CK_KXT3 | SW_BOOT1, SW_RESET1 |
| 1 | D_Schottky | D_SOT-23_ANK | D1 |
| 1 | 11mF | C_1210_3225Metric_Pad1.42x2.65mm_HandSolder | C1 |
| 1 | 1uF | C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C2 |
| 2 | 27 | R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R1, R2 |
| 2 | 10k | R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R3, R4 |
| 2 | 4k7 | R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R5, R6 |
| 4 | R | R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R7, R8, R9, R10 |
Watch logic design files
The KiCad project lives in the jeffc/nrf52-watch-obsolete repository on GitHub; these links point at the commit this page was built from.
Watch logic: common questions
How big is the Watch logic PCB?
The Watch logic measures 25.4 × 25.4 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Watch logic?
27 components, from 18 distinct parts. The full bill of materials is listed on this page.
Where can I download the Watch logic design files?
From the jeffc/nrf52-watch-obsolete repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Watch logic design in my own project?
The repository has no license, so all rights stay with jeffc. Use it as a reference, and ask the author before reusing the design.
More boards in nrf52-watch-obsolete
Nordic nRFMk2
23.5 × 37.5 mm49 parts2LNo license6
Watch
41 × 23 mm42 parts2LNo license6
Watch old
35.6 × 25.4 mm38 parts2LNo license6
Panel
25.4 × 25.4 mm35 parts2LNo license6
Watch power
25.4 × 16.3 mm17 parts2LNo license6
Flex
33.6 × 41.5 mm8 parts2LNo license6
Wrist
36 × 7 mm6 parts2LNo license6
Dock
34 × 17 mm4 parts2LNo license6
Backplate
28 × 35 mm3 parts2LNo license6
Tinysimpleled
13 × 6 mm3 parts2LNo license6
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