Yes, mobile devices can be connected to projectors subject to the availability of the TV-out feature on your smart phone.
Smart phones with the TV-out feature can be connected to the VGA port of a projector using a cable. The cable is usually bundled with the product, or could be purchased separately too.
Smart phones without the TV-out feature need the support of a computer. You will still be able to walk around the audience controlling the PPT from your Android mobile, which would be connected to the system via Bluetooth or remote display. The system, in turn, would be connected to a projector.
Owing to the increasing popularity of using mobile PPTs, certain high-end Android mobiles such as the Samsung Galaxy S, come with integrated projectors. These are however, best suited for small-group projections only.
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