HardLabs

USB

NaraenderHardware·pcb-design-manufacturing-engineering·designs/usb-pcb-design/HARDWARE/USB.kicad_pcb

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

About the USB PCB

USB is an open source AVR/Arduino PCB design by NaraenderHardware, published on GitHub under the MIT license. It is a 2-layer board measuring 40 × 12.2 mm, with 12 components from 10 distinct parts.

Its main chip is the L7805, from the AVR/Arduino family. Other key parts include the L7812. By type, the board carries 4 resistors, 3 diodes, 2 ICs, 2 connectors and 1 capacitor.

It belongs with the usb & debug tools designs in this gallery.

From the project

PCB design, circuit development, and manufacturing engineering project files.

Design Type: Embedded Microcontroller / Low-Speed USB 1.1 Development Dongle CAD Tool: KiCad Status: Schematic and PCB layout complete; static geometry checks clean; native KiCad ERC/DRC and hardware USB compliance validation pending

In this project, I designed a miniature USB development dongle based on the Microchip ATtiny85-20S 8-bit AVR microcontroller in an SOIC-8 package. The board plugs directly into a standard USB Type-A port and is designed for bit-banged USB communication (such as the V-USB library or Micronucleus bootloader), allowing firmware flashing and basic USB HID or CDC…

Main components on the USB

L7805L7812

USB bill of materials (BOM)

12 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
L7805
ATtiny85-20S
U1
1
L7812
~
U2
1
CONN_01X03
SO8-5-8
J1
1
CONN_01X02
SO8-1-4
J2
1
1N4007
LED
D1
2
1N4007
3V6
D2, D3
1
100n
C1
1
330R
R1
2
68R
R2, R3
1
1000R
R4

USB design files

The KiCad project lives in the NaraenderHardware/pcb-design-manufacturing-engineering repository on GitHub; these links point at the commit this page was built from.

USB: common questions

What microcontroller does the USB use?

The USB is built around the L7805, from the AVR/Arduino family.

How big is the USB PCB?

The USB measures 40 × 12.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the USB?

12 components, from 10 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 design files?

From the NaraenderHardware/pcb-design-manufacturing-engineering 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 design in my own project?

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

Can I test firmware for the USB 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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