Developing A USB Slide Show Presenter

Overview

The project comes in the size of a USB-key which is used as a slide show forward/backward button during an effective and interactive presentation.

Details

Without any special driver on the PC side, this USB slide show operates well independently by just plugging in as the circuit contains two buttons with one for going forward and one going to the previous photo or slide. The device uses the USB HID specification which includes features like mouse and keyboard. To implement USB in an AVR microcontroller without specialized hardware, the AVR-USB contains a GPL based driver. A software USB application note from Atmel can also be obtained from the AVR309. Since the software only USB is a low speed device, a USB-storage cannot be implemented with it but it is perfect for USB HID and works perfect and is very reliable.

The type of USB connector used is a standard USB-A with 4 pins. A 6-pin connector was drawn in the diagram since the outer USB shielding was also utilized. For tests during development, TP1 was used and TP2/TP3 are available to have a ground connected metal plane near the buttons for ESD protection.