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Micro wwvb

chgenly·micro-wwvb·kicad/micro-wwvb.kicad_pcb

Micro wwvb PCB layout, top view — open source AVR/Arduino board by chgenly

About the Micro wwvb PCB

Micro wwvb is an open source AVR/Arduino PCB design by chgenly, published on GitHub under the MIT license. It is a 2-layer board measuring 42.6 × 40.6 mm, with 16 components from 13 distinct parts.

Its main chip is the ATtiny44A, from the AVR/Arduino family. Other key parts include the TSM-103-01-T-SV-002 and 10125394-T0803ALF. By type, the board carries 4 resistors, 3 ICs, 3 LEDs, 3 capacitors, 1 crystal and 1 connector.

It belongs with the rf & radio and wearables designs in this gallery.

From the project

A low power WWVB transmitter for sycnhronizing an atomic watch from a GPS module

μWWVB is a low power 60 khz [WWVB] transmitter used to automatically set the time on radio synchronized clocks and wristwatches where the regular [WWVB] signal isn’t available. The system acquires the correct time via GPS.

If you are interested in building a WWVB transmitter, I recommend you look at pico wwvb. It's much cheaper to build, and a lot less work.

Micro wwvb, from the project README
From the project README

Main components on the Micro wwvb

ATtiny44ATSM-103-01-T-SV-00210125394-T0803ALF

Micro wwvb bill of materials (BOM)

16 components, 13 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATtiny44A
U1
1
TSM-103-01-T-SV-002
U$1
1
10125394-T0803ALF
U$2
1
ABM3-20.000MHZ-B2-T
Crystal
Y1
1
USB_B_Mini
J2
1
SM06B-SRSS-TB
JP1
1
Red(Power)
LED1
1
Green(GPS)
LED2
1
Blue(WWVB)
LED3
1
1 uF
C1
2
10pF
C2, C3
3
1k
R1, R2, R3
1
10k
R4

Micro wwvb design files

The KiCad project lives in the chgenly/micro-wwvb repository on GitHub; these links point at the commit this page was built from.

Micro wwvb: common questions

What microcontroller does the Micro wwvb use?

The Micro wwvb is built around the ATtiny44A, from the AVR/Arduino family.

How big is the Micro wwvb PCB?

The Micro wwvb measures 42.6 × 40.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Micro wwvb?

16 components, from 13 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 Micro wwvb design files?

From the chgenly/micro-wwvb 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 Micro wwvb design in my own project?

Yes, under the terms of its MIT license, which chgenly chose for the repository.

Can I test firmware for the Micro wwvb 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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