Level control Led

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druckgott
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Joined: 08 May 2020, 20:47

Level control Led

#1 Post by druckgott » 08 May 2020, 20:54

Hallo, I Hava A Switch on the Gipo 2.

This works perfekt, and I habe a Led on Gipo 16.therfore I have aded a level control which change if value from switch change to 1.
This also works and if i press teh butten the level control on gipo16 also switch between 0 and 1,but the output voltage on gipo 16 pin is - 2.5V to 2.5v ans not 0V to 5V.why is it like this

I want to do it with level comtrol becausr my mqtt server ist noch always running
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grovkillen
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Re: Level control Led

#2 Post by grovkillen » 08 May 2020, 21:29

First I recommend you update to the latest release. Then I would suggest you use rules for that.
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ESP Easy Netscan [find units]
Official shop: https://firstbyte.shop/
Sponsor ESP Easy, we need you :idea: :idea: :idea:

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ThomasB
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Re: Level control Led

#3 Post by ThomasB » 09 May 2020, 18:32

... the level control on gipo16 also switch between 0 and 1, but the output voltage on gipo 16 pin is - 2.5V to 2.5v and not 0V to 5V. Why is it like this?
The GPIO Pin's Logic High output voltage is approximately 3.3V, not 5V. If you require 5V output then you'll need additional circuitry, such as a transistor buffer.

The current draw from a LED can attenuate the GPIO output voltage to be less than 3.3V. So your 2.5V measurement is possible. If you require the voltage to be closer to 3.3V then you will need to increase the LED's series resistor value.

- Thomas

druckgott
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Posts: 8
Joined: 08 May 2020, 20:47

Re: Level control Led

#4 Post by druckgott » 10 May 2020, 10:03

Yes I have checked my l7805cv was ded. So I changed it not it works. thx

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