Neomatrix : Unplug Power and leave Data wire ?

EL Wire/Tape/Panels, LEDs, pixels and strips, LCDs and TFTs, etc products from Adafruit

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MisterYo
 
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Joined: Tue Apr 01, 2014 9:34 am

Neomatrix : Unplug Power and leave Data wire ?

Post by MisterYo »

Hello

Is there a danger to damage the Neomatrix if I unplug the Power wire but leave the Data wire connected to the arduino ?
I would like to be able to switch off my 5V alimentation leaving the arduino on.

If yes, what would be the best way do to an electronical switch to switch off the data wire of the neomatrix ? a transistor ?

Thank you !

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adafruit_support_mike
 
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Joined: Thu Feb 11, 2010 2:51 pm

Re: Neomatrix : Unplug Power and leave Data wire ?

Post by adafruit_support_mike »

MisterYo wrote:Is there a danger to damage the Neomatrix if I unplug the Power wire but leave the Data wire connected to the arduino ?
Yes. The data line could still send current into the chip.
MisterYo wrote:If yes, what would be the best way do to an electronical switch to switch off the data wire of the neomatrix ? a transistor ?
You'd probably want something like a two-inverter buffer powered from the same VCC rail as the NeoPixel strip:
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With that arrangement, no signal can reach the DI pin when the strip's VCC rail is disconnected.

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