Just playing around with these sensors and coding from the net. When I hook everything up the LM35 gets so hot it burns my finger, The DTH11 gets pretty warm but not as hot as the LM35.
I connected the sensors to different NANO's and still the same results. I tried both 3 & 5 volt pins
Any ideas ?
Thanks
TT
Put them in the bin, order some new ones and pay more attention to your wiring
Another weird thing happening now. I have everything hooked up except the ground pin.
At the top right in the Arduino 2 it shows the NANO and it being connected to com 4. When I plug the ground pin to the LM35 on the breadboard, the com port indication disappears. The LM35 is not getting hot but there is no connection. As soon as I pull the pin out the com port shows up again.
Guess you connected it wrong once and blew it... Connecting it as it should doesn't make it work again.. Just another stupid thing that can happen (been there, done that..) you think you plug in a LM35 but you actually picked something else, like a BC557... (for me it was time to buy glasses 
I have a bunch of LM35's and used a brand new one this time.
Is there a meter test I can perform across the pins ?
If you use a multimeter in Ohm, there should be no shorts between two pins, in both directions..
Never worked with a LM35, but i should have a look at the datasheet first..
Where did you buy the LM35s? There have been many reports of counterfeits. Do you have a volt meter and breadboard?
Hi,
Can you show us the circuit diagram of your project and some images of your project showing your component layout?
Specifically how your LM35 annd DTH11 are connected.
Thanks.. Tom... 
It is connected in typical manner. 5 volts to left pin, ground on right pin and data to middle pin connected to A0 on NANO. It should work. I connected same pin layout on my UNO and it worked. It tried it again on the 3 other NANO's and same problem. The NANO's work fine with other projects, just not with these temp sensors. I'm not going to bother with it until I get new sensors.
Hi,
Sorry what is?
Please a circuit diagram, it is worth 10's of misinformed posts.
Draw it with pen(cil) and paper and post an image of it.
A picture would help to.
Thanks. Tom..
With some confidence in the identity of the connections, it might be good to consider the subtleties of breadboard layouts. Sometimes the conductive strips don't align the way you believe they do.
I checked continuity for direction and it is what you would expect. Like I said, it worked ok with the UNO but not with any of the NANO's with the same wiring layout. 5V left pin, Ground right pin, data pin middle. Data on A0 pin. same sketch. Only difference is NANO or UNO.
I will put something together and post it
Hi,
That is not a LM35.
It is a Dallas 18B20.
It requires a different program to a LM35.
Can you please post your code.
Tom...
https://datasheets.maximintegrated.com/en/ds/DS18B20.pdf
You have it wired wrong!!!
Hi,
Google;
arduino uno ds18b20
This will help;
Tom...
Thank you community for your help in this. Should have posted pics a lot earlier.
Live and Learn
Hi,
Please post your code;
To add code please click this link;
Good to see you have a solution.
Thanks.. Tom..
PS. Lucky wrong connections didn't zap any of the sensors.
