HardLabs

Word watch

dragonlock2·kicadboards·projects/word_watch/word_watch.kicad_pcb

Word watch PCB layout, top view — open source AVR/Arduino board by dragonlock2

About the Word watch PCB

Word watch is an open source AVR/Arduino PCB design by dragonlock2, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 36 × 36 mm, with 122 components from 20 distinct parts.

Its main chip is the ATtiny1616-M, from the AVR/Arduino family. Other key parts include the MCP73831-2-OT and TG-3541CE. By type, the board carries 92 diodes, 13 resistors, 6 capacitors, 4 switches, 3 ICs and 2 connectors.

It belongs with the wearables designs in this gallery.

From the project

Offsite backup for the miscellaneous KiCad boards that don't fit elsewhere

Word clock but in watch form, which I realize has also already been done. The following arrangement of letters allows a 9x10 LED matrix.

ITISHALF QUARTERTEN TWENTYFIVE PASTOFOUR TWONESEVEN THREELEVEN FIVETENINE EIGHTWELVE SIXAMPM..

Main components on the Word watch

MCP73831-2-OTTG-3541CEATtiny1616-M

Word watch bill of materials (BOM)

122 components, 20 distinct parts.

QtyPartRefs
1
MCP73831-2-OT
U1
1
TG-3541CE
U2
1
ATtiny1616-M
U3
1
32.768kHz
Y1
1
charge
J1
1
updi/uart
J2
1
CR2032
BT1
1
btn_up
SW1
1
btn_down
SW2
1
btn_wake
SW3
1
SW-18020P
SW4
1
charge
D1
1
full
D2
90
LED_Small_Filled
D3, D4, D5, D6, D7, D8, D9, D10 +82
2
4u7
C1, C5
2
100n
C2, C6
2
20p
C3, C4
1
10k
R1
2
2k2
R2, R3
10
22
R4, R5, R6, R7, R8, R9, R10, R11 +2

Word watch design files

The KiCad project lives in the dragonlock2/kicadboards repository on GitHub; these links point at the commit this page was built from.

Word watch: common questions

What microcontroller does the Word watch use?

The Word watch is built around the ATtiny1616-M, from the AVR/Arduino family.

How big is the Word watch PCB?

The Word watch measures 36 × 36 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Word watch?

122 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the Word watch design files?

From the dragonlock2/kicadboards repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Word watch design in my own project?

Yes, under the terms of its Apache-2.0 license, which dragonlock2 chose for the repository.

Can I test firmware for the Word 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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