This has arisen on the forum before, & searching shows <A href='http://www.rev-ed.co.uk/picaxe/forum/Topic.asp?topic_id=3923&forum_id=21&Topic_Title=perisitance%2Bof%2Bvision&forum_title=No+new+posts+please%21+15 ' Target=_Blank>External Web Link</a>, and <A href='http://www.freewebs.com/adub/' Target=_Blank>External Web Link</a> etc.
<b>How ambitious is your need? LED or LCD ? </b> The diverse moving/spinning message approaches raise issues such as budgets,extra driver chips, LED array addressing, circuit draw current, multiplexing, display rate, message size/held in RAM ? & of course human persistence of vision (POV) perception. The latter is particularly fascinating!
With 16x2 LCDs now thick on the ground (& easily "Picaxable" via techniques such as Hippy's) it's tempting to just feed one horiz. scrolling serial output directly. Naturally the LCD display will be pretty small & dim compared with an LED array. However LCDs have a longer battery life if used portably- message name badge etc.
Get some inspiration from the likes of the moving/rolling message kits of Belgium firm Velleman <A href='http://www.vellemanusa.com/us/enu/product/search/?id=message ' Target=_Blank>External Web Link</a> - their 5x7 LED display (Kit MK124) is particularly lucid & striking for the parts involved.
Edited by - manuka on 20/01/2007 23:48:05
