PIC16F84A Thermometer




Posted in TechnologySensors

Introduction: PIC16F84A Thermometer

About: My name is marjancho and I love electronics,makeing gadgets,hack and pranks.

This is simple thermometer with just few components.
The brain is PIC16F84A and sensor is DS18B20
Range of sensor is -55 to 125°C is possible if ONLY the sensor is in that area not the whole device!
The schematic and other stuf to make this thermometer you can find on my blog:

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    please. killahill13@gmail.com

    Hi, I'm trying to build this, but because the lack of some information regarding translation I'm not able to mount this circuit. I think my problem is from the ds18B20 to the 0.1uf capacitor and the battery... When I put 5v through the circuit, my 4x 7led display goes on, but nothing happens.... They are all on 0000... Can somebody help me please?

    is there an asm file of this with english comment?not other languages?coz i cant understand the program...

    1 reply

    google translator works fine,shall I translate it for you?

    I also made a handheld version of it with cr2032 cell,skipping the resistors of display to give them just enough charge.


    I made one too just like you'r one-

    2 replies

    Good job suraj.

    had a hard time figuring out russian schematic
    those arrows are representing that those are connected to ic.
    will upload a schematic soon
    and also show pics of my version

    link on blog to HEX code does not work, please post here or provide a new link


    5 replies

     I check the link it's OK

    hello again
    And here is other link to download the hex code

    thankyou, you are most kind

     If you need any  help,just email me.

    he is probably multiplexing the two led displays
    the thing is that this is not an instructable mate its just a video of how your project works ... so please provide with the steps ?/

    Where is the second LED display on schematics?

    1 reply

    The thermometer in original schematis is with 4 segments,but I built it with 2 segments,other 2 show when thermometer is measuring below zero and other show half degree,example 26.0 or 26.5