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Temperature Sensor with Arduino

Former Member

I am following this link "Arduino - One Wire Digital Temperature Sensor - DS18B20" for my project in Arduino.I have a query in using the Temperature sensor.

 

As per the link,we should use Dallas temperature sensor DS18B20.They have also used Dallas and Onewire libraries.

 

However,I have bought LM35 temperature sensor.When I bought the component,I didnt check that.So,I am not sure whether I can still use LM35 as the sensor.

If I can use LM35 instead of DS18B20,what are the libraries I should use?Should I still continue using DallasTemperature.h and Onewire.h libraries?

 

Should I still use any resistor in the circuit while using LM35?Because,Arduino Temperature Sensor Interfacing (LM35) .THE EASIEST WAY does not show any resistor whereas with Dallas Temperature Sensor explained in the link "Arduino - One Wire Digital Temperature Sensor - DS18B20" shows 4.7K ohm resistor.

 

  • Radhamani, you do not need either of those libraries or the 4.7K resistor for the LM35.  The LM35 is a totally different device to the 18B20 because the 18B20 is a one wire serial bus device. The 18B20 is accessed using the proprietary one wire serial communication protocol, for example you send it a command to read the temperature it is measuring.  The 18B20 is a very versatile device and you can put multiple sensors on the one wire.  The two libraries take much of the coding work away and there are dozens of examples of its use on the internet.

     

    The LM35 is a voltage output device.  It outputs a voltage proportional to the temperature being measured.  You would read this voltage using the Arduino analog inputs.  Again there are dozens of sketches using this device on the internet.  I like the 18B20 and prefer it over the LM35.  You can obtain the 18B20 in a waterproof metallic case with a 1 metre cable which makes it ideal for real world sensing.

     

    Hope that helps

     

    Bob

  • in reply to bobcroft

    Thanks bob...I am planning to swtich to 18B20 and continue with my project...Thanks muchimage