Teensy 2.0++ USB AVR Development Board AT90USB1286 - Compact AVR Board

In this review the Teensy 2.0++ USB AVR Development Board is evaluated for hobbyists and developers who need a compact, versatile AVR platform. The board stands out for giving direct USB HID and mass-storage capabilities via the AT90USB1286 MCU, making it useful for keyboard, mouse and custom USB device projects. Our review focuses on real-world usability, the board's role as an ISP programmer and experimental prototyping platform, and why someone building Arduino-compatible or custom USB devices might choose this board.

Key Features

• AT90USB1286 MCU: Provides built-in USB support so users can create keyboard, mouse and U disk style devices without extra USB-to-serial hardware.
• ISP support: Enables in-circuit programming and bootloader updates, which simplifies developing and repairing firmware during prototyping.
• Compact form factor: Fits easily on a workbench or inside small enclosures, useful for embedded projects where space is limited.
• Experimental board layout: Exposes pins and headers to make wiring sensors, switches and LEDs straightforward for breadboard and shielded builds.
• Arduino compatibility: Works with Arduino toolchains adapted for the AT90USB series, lowering the barrier for makers migrating from classic AVR boards.

Who It's For

The Teensy 2.0++ is best for electronics hobbyists, keyboard and input device tinkerers, and developers who want native USB capability on a small AVR board. It suits people who plan to prototype custom Human Interface Devices or who need a compact development board with ISP flashing support.

It is less suitable for beginners who expect out-of-the-box Arduino Uno level plug-and-play compatibility; those users may prefer simpler starter boards with more mainstream community documentation and shields. Professionals needing high-performance ARM features should look elsewhere for more processing headroom.

Pros & Cons

Pros

• Native USB on the AT90USB1286 makes building HID and U disk projects straightforward.
• ISP header simplifies firmware updates and recovery without removing the MCU from the board.
• Small, experimental layout exposes pins for practical prototyping and custom wiring.

Cons

• Documentation and community resources are more limited compared with mainstream Arduino boards, which can slow initial setup for newcomers.

Specifications

Product name	Teensy 2.0++ USB AVR Development Board
Microcontroller	AT90USB1286
Functions	ISP, USB HID (keyboard/mouse), U disk
Platform	Arduino-compatible experimental board
Use case	Development board for USB AVR projects
Category	Single board computer / microcontroller development

Our Verdict

The Teensy 2.0++ is a compact, capable AVR development board for makers who need native USB and ISP support in a small package. It offers strong value for anyone building custom USB devices or experimenting with HID projects, though those new to AVR development should budget extra time for setup and documentation lookup. Overall it is a practical choice for focused prototyping work.

Frequently Asked Questions

Can this board act as a keyboard or mouse?
Yes. The AT90USB1286 provides native USB HID support so the board can be programmed to appear as a keyboard or mouse to a host.

Does it support in-circuit programming?
Yes. The board includes an ISP interface for flashing and recovering firmware without desoldering the MCU.

Is it compatible with Arduino tools?
It is compatible with Arduino toolchains adapted for the AT90USB series, although setup may require additional cores or configuration compared with mainstream boards.