Author Topic: Can a BBB run one or two strings simply via the GPIO?  (Read 110 times)

Offline learnedinuk

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Can a BBB run one or two strings simply via the GPIO?
« on: December 16, 2018, 01:52:36 PM »
All,


I have a BBB laying around and wondered if I could use it to drive 2 small strings via FPP in my house for lights down a railing. I know I can with a Raspberry Pi and have done so. I am wondering if i can do the same thing with a BBB?


My research has been fruitless so far.


Any thoughts?

Offline JonB256

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Re: Can a BBB run one or two strings simply via the GPIO?
« Reply #1 on: December 16, 2018, 02:16:05 PM »
While I know that a BBB with the proper Cape can drive 4, 8 or 16 outputs for pixels, I don't recall anyone ever doing it from just the GPIO outputs.

Dan Kulp would definitely know. If he doesn't see this and answer soon, send him a Private Message.

Offline learnedinuk

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Re: Can a BBB run one or two strings simply via the GPIO?
« Reply #2 on: December 16, 2018, 02:34:43 PM »
Thanks. Can you point me to the proper cape? Or a thread about making one?

Online dkulp

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Re: Can a BBB run one or two strings simply via the GPIO?
« Reply #3 on: December 16, 2018, 03:26:49 PM »
Technically you could run them directly from the GPIO, but just like on the Pi, it's strongly not recommended due to the 3.3v vs 5v difference and the potential to damage the GPIO's one the BBB.   A simple buffer chip and 100ohm resistor is all you "need". 


I believe that I do have some F8-B capes available if you are interested.   They have 8 outputs, fully fused and buffered, along with a bunch of expansion capabilities like DMX and differential outputs and such, but you likely don't need those.
Dan Kulp

Offline pixelpuppy

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Re: Can a BBB run one or two strings simply via the GPIO?
« Reply #4 on: December 16, 2018, 04:58:35 PM »
Buy Dans cape ... you wont regret it  :)
-Mark

 

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