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String Testing with Pi GPIO

Started by KaGeDad, November 23, 2022, 04:55:42 PM

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I am a total noob.  I want to test all my strings before I push them into my showpieces.  Unfortunately, I do not have my main pixel controller yet so I am trying to do some testing on my Pi running FPP.  I found a YouTube video on how to set up a virtual EEPROM that can act as a small pixel controller.  That is done and working.  I have my lights hooked up to 12v power on the Red and Blue wire.  The White wire is connected to GPIO 18 on the Pi.

I go to test the lights section on the FPP interface and turn on the test mode.  The lights just flash.  They are not following any pattern or resemble any color matching Red Green or Blue. 

Any thoughts on what might be going on?  Is what I am trying to do even possible?

Kensington Graves

FPP test mode pushes E1.31 data to whatever channels on whatever outputs are configured in the channel output tab.  I would think that you'd have to assign channels to the EEPROM and then have it listen for the data stream.

But why bother with FPP display testing if your ad hoc pixel controller is working?  All you need to check is that the lights turn on and shift color.  You should be able to do that with a relatively simple sketch on the RPi or even on an Arduino.


Did you tie the ground between the pixels and the Pi?  
Daniel Kulp -

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