How to connect itouch to the projector by the cable

Try the Apple Digital AV Adapter if your projector have a HDMI input. I use the adapter to connect to my LCD TV.

http://i1224.photobucket.com/albums/ee374/Diavonex/d94258cfc68543fb025bfdeae838a bf7_zps4a8f0ddb.jpg

The 4G and below can use Compositw, Component, VGA and Digital/HDMI cabler:

iOS: About Apple Digital AV Adapters

iPhone, iPad, iPod: TV out support

Just not that only aps that support TV will display on via TV out. The Video app is one such app.

For the 5G:

Lightning TV out

- Via Airplay to an Apple TV.

or one of these cables.

- http://store.apple.com/us/product/MD826ZM/A/lightning-digital-av-adapter?fnode=3 a

- http://store.apple.com/us/product/MD825ZM/A/lightning-to-vga-adapter?fnode=3a

Also, the TV out mirrors the iPod's screen unles the developer disabled that feature.