HardLabs

Watch

tux2603·watch·pcb/watch.kicad_pcb

Watch PCB layout, top view — open source AVR/Arduino board by tux2603

About the Watch PCB

Watch is an open source AVR/Arduino PCB design by tux2603, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 27.5 × 27.5 mm, with 23 components from 6 distinct parts.

Its main chip is the ATtiny402-SS, from the AVR/Arduino family. By type, the board carries 12 diodes, 7 resistors, 2 switches, 1 IC and 1 battery holder.

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

From the project

A simple, ATtiny402 powered binary wrist watch. Sponsored by PCBWay

A 12 hour wrist watch that displays the current time in BCD using LEDs. The watch is powered by a single CR2032 coin cell and uses an ATtiny402 microcontroller to keep track of time and drive the LEDs. The time can be viewed or set at any time by pressing the two buttons on the face of the watch.

PCB fabrication for this project was sponsered by PCBWay, and I would like to thank them for their support! I was very happy with the quality of the PCBs they sent me, and their staff was very easy to work with.

Watch, from the project README
From the project README

Main components on the Watch

ATtiny402-SS

Watch bill of materials (BOM)

23 components, 6 distinct parts.

QtyPartRefs
1
ATtiny402-SS
U1
1
BAT-HLD-001-TR
BT1
2
EVP-AA202K
SW1, SW2
12
LED_Small
D1, D2, D3, D4, D5, D6, D7, D8 +4
4
47 Ω
R1, R2, R3, R4
3
4.7 kΩ
R5, R6, R7

Watch design files

The KiCad project lives in the tux2603/watch 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 ATtiny402-SS, from the AVR/Arduino family.

How big is the Watch PCB?

The Watch measures 27.5 × 27.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Watch?

23 components, from 6 distinct parts. The full bill of materials is listed on this page.

Where can I download the Watch design files?

From the tux2603/watch repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Watch design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

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 AVR/Arduino firmware against it before you order a PCB.

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