The easiest and most useful is an HID keyboard, which is a device that does not require a driver, and acts just like a plain keyboard, but a little more customized. However, USB 1.1 cannot do stuff like virtual serial ports or mass storage devices, these require USB 2.0, sorry. Custom devices (you have to write your own driver though).MIDI devices (input notes from sensors, or generate outputs from notes, etc).many more… the drivers come from the operating system.For example, under USB 1.1, you can make low speed USB devices such as… The Trinket’s USB port is used for uploading sketches, but you can also use it for some basic USB 1.1 devices. Turning the Trinket into a standard USB keyboard! Frank shows you how! Hardware I2C / SPI capability for breakout & sensor interfacing.Tutorial – Make an Adafruit Trinket USB Keyboard – HID The Adafruit Learning System.The 2 shared IO pins have 2 more analog inputs and one more PWM output. The 3 independent IO pins have 1 analog input and 2 PWM output as well. 5 GPIO - 2 shared with the USB interface.No need to unplug/replug the board every time you want to reset or update! Reset button for entering the bootloader or restarting the program.On-board green power LED and red pin #1 LED.Power with either USB or external output (such as a battery) - it'll automatically switch over.Up to 16V input, reverse-polarity protection, thermal and current-limit protection. On-board 3.3V or 5.0V power regulator with 150mA output capability and ultra-low dropout.~5.25K bytes available for use (2.75K taken for the bootloader).We really worked hard on the bootloader process to make it rugged and foolproof, this board wont up and die on you in the middle of a project!.Mini-USB jack for power and/or USB uploading, you can put it in a box or tape it up and use any USB cable for when you want to reprogram.USB bootloader with a nice LED indicator looks just like a USBtinyISP so you can program it with AVRdude (with a simple config modification) and/or the Arduino IDE (with a few simple config modifications).Internal oscillator runs at 8MHz, but can be doubled in software for 16MHz.ATtiny85 on-board, 8K of flash, 512 byte of SRAM, 512 bytes of EEPROM.
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