hi,
I wish to create a visual effect using a canvas painted in thermochromic pigment, which will require 24 heated pads randomly switching on and off, to turn the thermochromic pigment, clear or black respectively.
is there any IC which can randomly output and do this? it doesnt need to be all 24 going randomly, it could be 12 with half having simple delay in place to turn the second or even thrid transistor on later, at least giving the illusion of it being random.
alternatively, two out of phase sequencers that run through each transistor at two different frequencies so they never match up, again, giving the illusion that they are occuring randomly.
i considered just having simple flasher circuits on each transistor, but that wont be as effective as i want there to only be 1 or 2 pads active at a time, and even so, its too basic and i want to needlessly challenge myself.
so please, if anyone knows of some method or IC that will randomly switch one output on at a time (in which case it doesnt matter wether or not the time on/off is random), or a 12/24 pin sequencer IC, please let me know. Prefferbly though ide like the random output instead of the sequencer.
thanks