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LED voltage measurement question

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Lucky-Luka:
Hi all
I'm starting building simple circuits to better understand the theory related to them.
As soon as i've finished my first ever super simple circuit something isn't clear at all...
I'm talking about my LED voltage measurement.
I have a breadboard with a 5V power supply attached.
When the power supply is disconnected from the board and when the button on the breadboard is pressed and the power supply is attached to the breadboard I can assume that what I read in the voltmeter is right but I cannot understand what's going on when the power supply is attached to the breadboard and the button on the breadboard is not pushed. Why do I read -1.308V (power on) and -1.496V (power off)?
Thanks for your help.

Luca

Audioguru:
Like you were told on the other website, use a battery instead of a wallwart.

jackbob:
It is difficult to tell from the pictures. The board you are using for power seems to have multiple regulators on board likely 5V and 3.3V but i'm not sure. It could be due to some difference between these voltage rails and how that board you are using for power is configured. To simplify it further, use a battery or a simpler power supply with only one rail and not all the voltage regulation on board.

Lucky-Luka:

--- Quote from: Audioguru on March 29, 2019, 01:12:58 am ---Like you were told on the other website, use a battery instead of a wallwart.

--- End quote ---

Audioguru I understand that you have seen my question in other forums but I don't understand why feel the urge to tell everybody about it in each forum where you have seen my question.
Well, never mind. Can you give me another answer to my problem? What if I don't want to use batteries?

Luca

Lucky-Luka:

--- Quote from: jackbob on March 29, 2019, 08:16:18 am ---It is difficult to tell from the pictures. The board you are using for power seems to have multiple regulators on board likely 5V and 3.3V but i'm not sure. It could be due to some difference between these voltage rails and how that board you are using for power is configured. To simplify it further, use a battery or a simpler power supply with only one rail and not all the voltage regulation on board.

--- End quote ---

Thanks for your suggestions.

Luca

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