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Topic: Controlling LED Board (Read 212 times) previous topic - next topic

dougk7

I have an LED Board that I want to be able to control the brightness of with an arduino uno. I'm somewhat of an electronic newbie so any help would be appreciated. (The board used to be connected to a PIR motion sensor)

Picture of board:


Paul__B


PaulRB

What is fed into those "IN +/-" terminals? 110 or 230VAC? If so, I would guess the large component is a triac, and the output to the panel is also 110 or 230VAC. This will make controlling the brightness much more difficult than with a DC panel.

Paul__B

#3
Apr 09, 2019, 07:25 pm Last Edit: Apr 09, 2019, 07:32 pm by Paul__B Reason: Closer look
What is fed into those "IN +/-" terminals? 110 or 230VAC?
Better not be, particularly when they are marked "+" and "-" and there is no isolation from the logic supply.  :smiley-eek:

Not to mention the electrolytic capacitor.



OK, the regulator is clearly a 78L05, but we want to know what the switching transistor is?

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