Arduino compatible without extra programmer and/or FTDI chip (USB<->serial) needed! Plus exchangeable bootloader
Works as an usbasp programmer , consumer/hobby- and evaluationboard!
Usable to construct your own (V-)USB devices like keyboards, mouses or your own protocols.
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Althought tinyUSBboard has a variaty of different (and exchangeable) bootloaders, its default one is USBaspLoader.
In normal mode the bootloader simply starts up the firmware, the user programmed into the AVR last time using the program-mode