VUSB-AVR
VUSB-AVR is a board definition package for the Arduino IDE, which was put together from already existing projects to simplify the development of USB devices with AVR microcontrollers. It is based on V-USB, which is a software-only implementation of low-speed USB devices for AVR microcontrollers, making it possible to build USB hardware with almost any AVR microcontroller, not requiring any additonal chip. The package includes board definitions for ATtiny44/84/45/85 and ATmega8/168p/328p as well as libraries and example sketches to build CDC, keyboard, mouse and joystick applications.
The package is based on:
- V-USB by Objective Development
- Digistump libraries and examples
- V-USB adaptation by Ralf Beesner
- ATtiny core by David A. Mellis
- ATmega core by Carlos Rodrigues
Installation
- Open Arduino IDE
- Go to File -> Preferences
- Enter the following URL in Additional Boards Manager URLs:
https://raw.githubusercontent.com/wagiminator/VUSB-AVR/main/archive/package_wagiminator_vusb_avr_index.json - Separate the URLs using a comma ( , ) if you have more than one URL
- Go to Tools -> Board -> Boards Manager...
- Wait for the platform indexes to finish downloading
- Scroll down until you see the AVR-USB entry and click on it
- Click Install.
- After installation is complete close the Boards Manager window
Hardware Setup
A typical wiring is shown below:
The standard connection of D-/D+ to the physical pins of the AVR is shown in the table below:
| AVR Microcontroller | D- | D+ | Clock |
|---|---|---|---|
| ATtiny45/85 | PB3 | PB4 | 16.5 MHz internal |
| ATtiny44/84 | PA1 | PA0 | 12 MHz external |
| ATmega8/168p/328p | PD7 | PD2 | 12 MHz external |
Software Setup
- Open Arduino IDE
- Go to Tools -> Board -> VUSB AVR and select VUSB-AVR
- Go to Tools and select your CPU and your Programmer
- Connect your programmer to your PC and your board
- Go to Tools -> Burn Bootloader to burn the fuses
- Now you can upload your sketch
For the example sketches go to File -> Examples -> Examples for VUSB-AVR.