 RGB LED phenomenon
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Conundrum
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Sat Mar 14 2015, 01:44PM
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
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It is intriguing to note that I have observed a "Pi Death Flash" like effect on rectangular RGB LEDs as well (tested just now) - if you shine a bright continuous wave infrared source into the LED the sequence is affected and in some cases stalled because presumably the red LED is sending voltage back into the chip and screwing with the timing.
Also worth noting that these can be synced up using power fluctuations as well and the xenon flash effect sometimes occurs with programmable LEDs such as the WS281x although I haven't tried it yet.
It works better with a laser but any suitably bright source would work- the green seems to flicker faintly in time with the pulses so obviously the signal is getting back in through the red as theorized.
It also works with the diffused ones as well, any RGB sequential LED even the flashing/fading ones should work although the latter might be a bit harder to predict.
Time until someone uses this to make a "synchronized green LED throwie" effect in time for St Patricks Day .. 3..2..1..
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