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Attiny85-usb hid

69series·attiny85-usb-hid·hardware/t85-usb.kicad_pcb

Attiny85-usb hid PCB layout, top view — open source AVR/Arduino board by 69series
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About the Attiny85-usb hid PCB

Attiny85-usb hid is an open source AVR/Arduino PCB design by 69series, published on GitHub under the MIT license. It is a 2-layer board measuring 33.7 × 12 mm, with 16 components from 8 distinct parts.

Its main chip is the ATTINY85-20S, from the AVR/Arduino family. By type, the board carries 6 test points, 4 resistors, 3 diodes, 1 IC, 1 connector and 1 capacitor.

It belongs with the keyboards designs in this gallery.

From the project

ATTiny85 HID automation keyboard both firmware and hardware design in baremetal C and KICAD 10 respectively.

A fully custom USB HID keyboard dongle built on ATtiny85 — bare metal C firmware, custom PCB designed in KiCad 10, no Arduino, no HAL, no bootloader abstractions. Plug it into any USB port and it enumerates as a real HID keyboard device.

A fully custom USB HID keyboard dongle...

Plugs directly into a USB-A port and acts as an autonomous HID keyboard. Planned automation payloads (see firmware/ for examples):

Attiny85-usb hid, from the project README
From the project README

Main components on the Attiny85-usb hid

ATTINY85-20S

Attiny85-usb hid bill of materials (BOM)

16 components, 8 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATTINY85-20S
ATtiny85-20S
U1
1
~
J1
6
TestPoint
TP1, TP2, TP3, TP4, TP5, TP6
2
3V6
D1, D2
1
LED
D3
1
100N
100n
C1
2
68R
R1, R2
2
1K5
1k5
R3, R4

Attiny85-usb hid design files

The KiCad project lives in the 69series/attiny85-usb-hid repository on GitHub; these links point at the commit this page was built from.

Attiny85-usb hid: common questions

What microcontroller does the Attiny85-usb hid use?

The Attiny85-usb hid is built around the ATTINY85-20S, from the AVR/Arduino family.

How big is the Attiny85-usb hid PCB?

The Attiny85-usb hid measures 33.7 × 12 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Attiny85-usb hid?

16 components, from 8 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 Attiny85-usb hid design files?

From the 69series/attiny85-usb-hid 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 Attiny85-usb hid design in my own project?

Yes, under the terms of its MIT license, which 69series chose for the repository.

Can I test firmware for the Attiny85-usb hid 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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