celsuis and fahrenheit digital thermometer

[harjas kaur]

i have made a project- lcd based celsius and
 fahrenheit
 digital thermometer using microcontroller 8051…i wanted to ask how can
 we
 get the exact temperature…means if we rotate the preset then the
 temperature changes …sometimes it reaches 120 F…which is
 impossible…in
 dis way we will not be able to get the exact atmospheric
 temperature…please
 please help!!!

[umar farrok]

the reason is to convert your analog value of your temp values using adc reference pin of adc is the main consideration . exmple for 1c what is the voltage value you have to know. from that you do some simple calc and set that voltage level in your adc ref pin

you will get correct values 

[sanan]

hello harjas can you tell me how did u run your circuit because i am not successful 

and i cant understand why its not working my lcd did not showing anything and also adc ref. pin showing nothing tell me what i hav to do now!!

[AJISH ALFRED]

Hi Sanan,

Please post your circuit here to get better help from us.

[sanan]

here is my circuit plz watch it its not working i made hex in keil 

  

wysiwyg_imageupload:9985:

[sanan]

wysiwyg_imageupload:9986:b

[sanan]

Hello
Sir kindly pay attention to my requestt its
Its realy urgent.

[sanan]

hello sir

         Kindly Pay attention to my request i m still waiting

[harjas kaur]

i am not able to understand….please can anyone tell me the steps to follow…

[sanan]

I hav followed all steps which is possible but no any output on lcd

[Author]

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