SlashGear

If you’ve ever wanted to use your iPhone as a projector, but are too cheap to shell out for a pico-projector like the AAXA P1, perhaps this DIY system is for you.  What you gain in price, you lose in flexibility, however; the system uses 35 individual laser pointers to recreate any bitmap font. 

Video demo after the cut 

The 35 laser modules are arrayed in a 5 x 7 matrix, slotted into basic PCB board.  Each is wired up to a microcontroller – in this case a PIC16F722, though an Arduino would do nicely too – via five 8-bit latches.  The software on the iPhone communicates via the serial port, and lets you type in a sentence and have it automatically mapped into different laser layouts. 

One suggestion is to swap the cheap lasers – which cost $0.40 each on eBay – for something more powerful, and use the iPhone as a portable projector to paint slogans on buildings.  Not much use for enjoying impromptu mini-cinema-style movies, but a cool hack all the same.

[via MAKE]