avr usb slideshow presenter.


Posted on Feb 5, 2014

USB HID is a specification that includes things like mouse and keyboard. has a GPL based driver to implement USB in an avr microcontroller without specialized hardware. There is also the AVR309, software USB application note from Atmel. I don`t know who invented it first Atmel or the people from obdev. at or somebody else. In any case the people from obdev.


avr usb slideshow presenter.
Click here to download the full size of the above Circuit.

at have done a great job. It is an easy to use library with a large number of examples. It works perfect and is very reliable. Software only USB is a low speed device. You can`t implement usb-storage with it but it is perfect for usb HID. The USB connector is a standard USB-A connector with 4 pins but I wanted to use the outer USB shielding also. It is therefore drawn in the diagram as a 6 pin connector. TP1 was used for tests during development and TP2/TP3 are there to have a ground connected metal plane near the buttons for ESD protection of the hardware. It was fun to build this "slide show presenter". The software emulates a HID keyboard and works out-of-the-box without requiring any special software or driver. You can use it under Window, Linux, Mac, BSD. Just plug the USB connector in, wait a few seconds for the enumeration on the USB bus and start your slide show. This little presenter works with any presentation software. Powerpoint, OpenOffice, . you name it.




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