I inetrface LM35 with arduino leonardo....intially the correct value was sensed by LM35 then the IC pre heated and temperature value increase gradually.what can i do ,please any one help me..

Views: 206

Replies to This Discussion

Hi,

I attached the datasheet because I am not sure if you have it.  Read it over if you haven't already.

It is probably measuring the temperature correctly so you have to figure out what could be making the temperature go up.  It could be where it is placed.  I cannot give advice without having a lot more information about what you are doing with it and how you hooked it up.

Start with the datasheet and then lets go from there...

Attachments:

i use the detail given in the following attached file...the temperature value not stable..and also IC heated..what is the reason? any other interface circuit method available

Attachments:

It's good that you are using a proven circuit configuration.  This helps narrow down the possibilities.  It would be helpful if you stated the temperature readings you are getting over time.  Example, at power on, one second later, two seconds later, etc.  Also, if the IC is getting too hot to touch it, there is definitely something wrong and you should immediately disconnect the power. 

Here is a partial list of possibilities from most likely to least likely:

1) Something is connected incorrectly.  Do you have a multimeter?  It is best to check the connections with a multi-meter on the ohms setting.  If you don't know how, find a YouTube tutorial.  If you are an expert, you can probably find the mistake visually.

2) Any possibility the power input voltage is incorrect?  Double check it with the multi-meter on the DC volts setting. (Again, YouTube if you don't know how).

3) Incorrect component value populated.  It is easy to mis-read the component value.  Example, 10 ohms or 100 ohms instead of 10K ohms.

4-100: A bunch of reasons I forgot about.

101) Faulty component.  Extremely unlikely unless you actually burned it out in the process of monkeying around.  The way to check it is to isolate each component one at a time and measure them with a meter.  E.g., measure your potentiometer in each setting (lowest and highest), hook up the temp sensor in a basic circuit without the Arduino.  If it works on its own, it will work in the circuit.  If it still doesn't, there is something else wrong.

The reason I put Faulty Component as # 101 is in my experience it is the least likely problem with a new circuit.  Usually the problem is caused by something to do with the wiring.

Have you used a breadboard before?  If not, don't assume you know how it works.  Use some small wires and a meter to figure out where the internal breadboard connections go.  You could be assuming something about the breadboard that is wrong.

thank u sir.i will check and tell the result.

RSS

Latest Activity

GarageLab posted blog posts
yesterday
Chris is now a member of GarageLab (arduino, electronics, robotics, hacking)
yesterday
soheil gharatappeh commented on GarageLab's blog post Tutorial: How to use a Shield RS485 and USB/RS485 Converter with Arduino
"Can you describe what is the reason for this line? KEY = map(digitalRead(4), 0, 1, 0, 1);it maps a…"
Wednesday
GarageLab posted a blog post

Ubuntu Core running on the Raspberry Pi 2 with access to GPIO

Although not officially Ubuntu Core makes progress and will not be pass behind by the IoT Windows…See More
Tuesday
Profile Iconsoheil gharatappeh, Bill Mills and Jory Hickman joined GarageLab (arduino, electronics, robotics, hacking)
Tuesday
GarageLab posted a blog post

Project Sunroof

Now Google aims to help people evaluate the potential of their roofs to generate electricity. The…See More
Monday
GarageLab posted blog posts
Aug 28
Profile IconGaroppolo, meke, M N Ranganathan and 1 more joined GarageLab (arduino, electronics, robotics, hacking)
Aug 28
GarageLab posted a blog post
Aug 26
GarageLab posted blog posts
Aug 25
Profile IconDennis P Smith, Ronald Ong Jr., FRANK KWABENA and 4 more joined GarageLab (arduino, electronics, robotics, hacking)
Aug 24
GarageLab posted a blog post
Aug 20
Achyut Raj is now a member of GarageLab (arduino, electronics, robotics, hacking)
Aug 20
Profile IconJorge Luis Antezana B., Andre, Evan conger and 1 more joined GarageLab (arduino, electronics, robotics, hacking)
Aug 19
GarageLab posted blog posts
Aug 18
Denver S Conger posted a photo
Aug 17
Denver S Conger updated their profile
Aug 17
Profile Iconalain and Xolbrin joined GarageLab (arduino, electronics, robotics, hacking)
Aug 17
GarageLab posted blog posts
Aug 14
Jean Luc Claveur is now a member of GarageLab (arduino, electronics, robotics, hacking)
Aug 14

© 2015   Created by Marcelo Rodrigues.

Badges  |  Report an Issue  |  Terms of Service