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1. 

   compuslave
   Member

   Hi guys, sorry if this is in the wrong section, but I didn't see a more appropriate place. I have one of those 7 color LEDs and wanted to write a sketch where I could enter a number, 1-7 and have the LED show the corresponding color. There is no data sheet on this device, but I did find some info for it. It cycles through the colors based on pulses from a momentary switch. I wanted to implement the switch digitally in the maple realm. I'm not sure that it will work, but I think I can give a number of quick pulses and have it go to that color.

   So I guess it needs to read from serialUSB a value, then turn that into a number of pulses on a digital pin which will activate a transistor. All I have are PNP transistors atm. Can I do this somehow without a transistor?

   Any help would be appreciated. Pointing me to a sketch I can modify would help as would any basic electronics know-how. Thanks in advance!

   Posted 3 years ago #
2. 

   compuslave
   Member

   Forgot to say that it may also be interesting to use a potentiometer rather than serial, but both would be ideal as I would learn more.

   Thanks fellas!

   Posted 3 years ago #
3. 

   crenn
   Moderator

   Unfortunately without knowing more about the LEDs, we're not able to help much. If the LED draws more than 8mA from the signal source, then I'd say that using a transistor is a better idea. You can still use PNP transistors, just 'flip' the signal so to speak (HIGH instead of LOW, etc), however I'll admit my knowledge on transistors is rather limited.

   Can you give us a circuit diagram of how it was previously layed out? And how you're intending to lay it out?

   Posted 3 years ago #
4. 

   compuslave
   Member

   Jeezus, I'm dense. I didn't think of switching the signals that way. Thanks, mang!

   Basically I have an LED with three leads. Mode, VCC and ground. VCC stays hot and when mode is grounded it switches colors.

   Posted 3 years ago #

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