HardLabs

Watch old

jeffc·nrf52-watch-obsolete·kicad/watch/watch-old.kicad_pcb

Watch old PCB layout, top view — open source board by jeffc

About the Watch old PCB

Watch old is an open source PCB design by jeffc, published on GitHub. It is a 2-layer board measuring 35.6 × 25.4 mm, with 38 components from 27 distinct parts.

Other key parts include the 113990582, W25X20CLUXIG, MCP73831-2-OT, M41T62Q and TPS63001. By type, the board carries 14 resistors, 6 connectors, 5 ICs, 4 capacitors, 2 transistors and 2 crystals.

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 old

113990582W25X20CLUXIGMCP73831-2-OTM41T62QTPS63001

Watch old bill of materials (BOM)

38 components, 27 distinct parts.

QtyPartRefs
1
113990582
IC1
1
W25X20CLUXIG
U1
1
MCP73831-2-OT
U2
1
M41T62Q
U3
1
TPS63001
U4
2
DMN6140L
Q1, Q2
1
Crystal
Y1
1
32.768 kHz
Y2
3
Conn_01x04_Female
J1, J2, J3
1
Memory LCD
J4
1
LCD Frontlight
J5
1
Buzzer
J6
1
Battery_Cell
BT1
2
SW_Push
SW_BOOT1, SW_RESET1
1
D_Schottky_x2_KCom_AAK
D1
1
1uF
L1
1
10uF
C1
2
22uF
C2, C3
1
1uF
C4
1
12.5k
R3
Show 7 more
QtyPartRefs
4
R
R4, R5, R11, R12
2
27
R6, R7
2
10k
R8, R9
1
100
R10
1
2M
R13
1
4M
R14
2
4k7
R15, R16

Watch old 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 old: common questions

How big is the Watch old PCB?

The Watch old measures 35.6 × 25.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Watch old?

38 components, from 27 distinct parts. The full bill of materials is listed on this page.

Where can I download the Watch old 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 old 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.

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