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Topic: Fried DHT11? (Read 915 times) previous topic - next topic

1domen1

Jul 17, 2018, 07:23 pm Last Edit: Jul 17, 2018, 07:25 pm by 1domen1
Hello!

I'm working on a project where i want to regulating pressure in the room and watching temperature/humidity aoutside and inside the room.
While I had everything at the protoboard, everything was good. Then I instal things in the room and turn on, the room sensor DHT11 stop working (burn out).

The problem is, where is the green squere on the photo.
I don't know where the problem is. Can you please give me a hand and help me.

I suspect that the problem is LCD. Maybe it makes  the negative voltage or make the positive voltage on GND wire  or something similar.


Thanks you a lot for any advice.


PHOTO:
https://ibb.co/jq48Yd

Grumpy_Mike

Quote
While I had everything at the protoboard, everything was good. Then I instal things in the room and turn on, the room sensor DHT11 stop working (burn out).
Then you made a mistake wiring it in your room. Unfortunately a schematic, however bad, will not show us where you made the mistake.
When you wire it up again do it one sensor at a time so you know what step causes the mistake if you make one again.

DrAzzy

#2
Jul 17, 2018, 08:51 pm Last Edit: Jul 17, 2018, 08:51 pm by DrAzzy
My guess is you wired it backwards (I mean, it's got three pins, there's not much else you could do that would damage it). This will instantly toast DHT-series sensors; avoid doing this.
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Wawa

#3
Jul 18, 2018, 06:50 am Last Edit: Jul 18, 2018, 06:53 am by Wawa
The DC socket of an Uno needs at least 7.5volt for the onboard regulator to make a stable 5volt for the MCU.
The Uno/sensor/LCD gets less than 3.5volt the way you have connected it.
Leo..

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