HardLabs

USB Timer

Stevemwa·PCB_Designs·USB_Timer/USB_Timer.kicad_pcb

USB Timer PCB layout, top view — open source AVR/Arduino board by Stevemwa

About the USB Timer PCB

USB Timer is an open source AVR/Arduino PCB design by Stevemwa, published on GitHub. It is a 4-layer board measuring 21.6 × 40 mm, with 16 components from 12 distinct parts.

Its main chip is the ATTINY85-20SU, from the AVR/Arduino family. Other key parts include the DS1307Z+. By type, the board carries 6 resistors, 2 ICs, 2 connectors, 2 diodes, 2 capacitors and 1 transistor.

It belongs with the dev boards & breakouts designs in this gallery.

From the project

This Repo contains my various PCB Designs

USB Timer, from the project README
From the project README

Main components on the USB Timer

DS1307Z+ATTINY85-20SU

USB Timer bill of materials (BOM)

16 components, 12 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
DS1307Z+
U2
1
ATTINY85-20SU
U3
1
IRLML6401
Q2
1
Crystal
Y1
1
USB_A
J2
1
USB-AM-S-X-X-TH
J3
1
1N5819
D1
1
LED
D2
1
0.1uF
C1
1
4.7uF
C2
3
10k
R1, R2, R3
3
4k7
R4, R5, R6

USB Timer design files

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

USB Timer: common questions

What microcontroller does the USB Timer use?

The USB Timer is built around the ATTINY85-20SU, from the AVR/Arduino family.

How big is the USB Timer PCB?

The USB Timer measures 21.6 × 40 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the USB Timer?

16 components, from 12 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 USB Timer design files?

From the Stevemwa/PCB_Designs 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 USB Timer design in my own project?

The repository has no license, so all rights stay with Stevemwa. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the USB Timer 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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