polosid Posted December 12, 2008 Report Share Posted December 12, 2008 what can i use to drive groups of 16 or more leds from a single dout pin?i don't want to use relays with mechanical parts. is there an alternative? Quote Link to comment Share on other sites More sharing options...
Max Romantschuk Posted December 12, 2008 Report Share Posted December 12, 2008 I don't know about the exact details, but a technique called multiplexing can be used to drive more than one led from a smalled amount of pins. Try searching for "led multiplex" or "led rings" for some pointers in the right direction. Use the advanced search and check "Show results as messages" for more easily read results.You do mean driving more than one led so that some can be on and some off, right?In any case, relays shouldn't be needed regardless of the technique. A plain old solid state transistor can be used to switch a circuit on or off, relays are only needed when switching an independent circuit (say mains or something) on or off by a control voltage from another circuit. Quote Link to comment Share on other sites More sharing options...
polosid Posted December 12, 2008 Author Report Share Posted December 12, 2008 no no... i don't need to control each led individually.the leds are connected all together in a cluster... Quote Link to comment Share on other sites More sharing options...
fcebreros Posted December 12, 2008 Report Share Posted December 12, 2008 You can use a transistor to drive the leds. How many leds do you want in one pin? Quote Link to comment Share on other sites More sharing options...
SLP Posted December 12, 2008 Report Share Posted December 12, 2008 see http://www.midibox.org/forum/index.php/topic,11642.0.htmlespecially:use the uln2803 8 darlingtons in 1 handy pkg... Quote Link to comment Share on other sites More sharing options...
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