Mini project Digital Volt Meter (DVM) using PIC16F877A with C code

DVM Project Overview

Digital Volt Meter is a Mini Project that I made as my project of the subject ‘Microprocessor Based Instrumentation System’. In this project, I have used three major electronic components. They are PIC16F877A, LCD Display (16 X 2) and Low power Quad op-amp (LM324). PIC16F877A is used as an ADC module which converts the analog input into corresponding 10-bit digital output. It also provides enable and RS signals to the LCD display. LCD Display is used to display the converted digital binary data to decimal format so that user can easily understand the voltage. And finally, Low power quad op-amp is used as a buffer and an inverter. The DVM measures the voltages ranging from –50 V to +50 V

. But PIC can operate only up to +5 V. So to measure the +50 V, the voltage divider is used. This divider divides the input voltage 10 times so that +50V input voltage now becomes +5V at the PIC input.  Inside PIC a program is written which multiplies the converted digital value by 10 before sending it to the LCD display. A screen capture of a rough design of the project in Proteus 7.0 Professional is given below.

PIC16F877A ADC Module
The A/D converter module has eight inputs. The conversion of analog input results in a corresponding 10 bit digital output. The A/D module has four registers. They are
  1. A/D Result High Register (ADRESH)
  2. A/D Register Low Register (ADRESL)
  3. A/D Control Register 0 (ADCON0)
  4. A/D Control Register 1 (ADCON1)
The ADICON0 register controls the operation of the A/D module and the ADICON1 register configures the functions of the port pins.
The structure of ADICON0
ADCS1ADCS0CHS2CHS1CHS0GO/DONE’ADON
bits 7-6 : ADCS1:ADCS2 => Conversion channel select
bits 5-3: CHS2:CHS0 => Analog channel select [000 = Channel 1, 001 = Channel 2 and so on up to channel 7]
bit 2: GO/GONE’ => AD Conversion status bit [1 indicates conversion in progress and 0 indicates conversion not in progress]
bit1: Unimplemented
bit 0: ADON => A/D on bit [1 indicates converter module is power up and 0 indicates shut down]

The structure of ADICON1

ADFMADCS2PCFG3PCFG1PCFG0
bit 7 : ADFM => A/D Result format [1 indicates Right Justified and 0 indicates Left Justified]
bit 6: ADCS2 => Conversion channel select
bits 5-4: Unimplemented
bits 3-0: A/D port configuration control bits

LDC Display (16 x 2)

Pin No.NameFunction
1VssGround
2Vdd+Ve Supply
3VeeContrast
4RSRegister Select
5R/WRead/Write
6EEnable
7D0Data bit 0
8D1Data bit 1
9D2Data bit 2
10D3Data bit 3
11D4Data bit 4
12D5Data bit 5
13D6Data bit 6
14D7Data bit 7

C Source Code

 

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39 Responses

  1. farlind says:

    can u give me a detail pictures due to i cannot see with detail component.hope u can help me.thanks..please email to [email protected]

  2. Bibek123 says:

    i have emailed you..see your mailbox…

  3. bjs says:

    please send me one detailed picture of the circuit([email protected]). thanking you

  4. Mir Mehedi says:

    can you help me to make a line follower robot using pic 16f877?
    [email protected]

  5. SREEJA P says:

    can u give me a detail pictures due to i cannot see with detail component.hope u can help me.thanks..please email to [email protected].

  6. bjs says:

    can u please give me a detailed circuit of the project. please email me at [email protected]

  7. Arun S says:

    hi am arun. i have some problem,Error 128 "volt.c" Line 6(1,5): A #DEVICE required before this line
    __CONFIG(HS & WDTDIS & PWRTEN & BORDIS & LVPDIS);

    how to solve this
    i am using ccs c compiler plz help

    my mail [email protected]

  8. alex.y.k says:

    Hi, can u give me a detail pictures due to i cannot see with detail component.hope u can help me.thanks..
    please email to [email protected].

  9. Hi, I too need a detailed picture of the circuit. Please email it to me at [email protected]

  10. can u give me a detail pictures because i cannot see with detail component.hope u can help me.thanks..please email to [email protected]

  11. rashid says:

    also send me the pictures please? [email protected]

  12. Is this project will work…….
    Because i designed this project not working.
    It displaying an block line only..

    Kindly give your reply.

    THANK YOU

  13. Anonymous says:

    Can you provide me the details of this ?
    such as simulation Kindly mail me at
    [email protected]
    thanks 🙂

  14. Isra says:

    Hi, can u give me a detail pictures due to i cannot see with detail component.hope u can help me.thanks..
    please email to [email protected]

  15. i_phen says:

    Hello there.. i cannot clearly identify the other electronic components could you email me the detailed image please? Thank you!

    [email protected]

  16. iwyz80 says:

    where is the probe in the circuit should I want to measure a component?

  17. as ae says:

    could you email me the detailed image please? Thank you!
    please email me [email protected]

  18. Anonymous says:

    Hi, kindly email me the schematic with clearer component labels at [email protected]. Thank you

  19. thanks this is good example could u email for the simulation and the source code very grateful for this

    [email protected]

  20. i need a clearer schematic diagram of this circuit. If you don't mind sending, please do at [email protected] or [email protected]

    thanks

  21. hi good morning great project. can you please email me the picture to see with detail, the components to buy them. i will build it. Thank you very much

    [email protected]

  22. can u pls give me a detailed info about the construction of simple digital voltmeter…..
    [email protected]

  23. pls give me the picture of detailed component thanks 🙂
    my email is [email protected]

  24. Najam Butt says:

    can you please provide me with a high resolution pic of the simulation or the .DSN file at this email address ( [email protected])? …thanks in anticipation….. 🙂

  25. hi good morning great project. can you please email me the picture to see with detail, the components to buy them. i will build it. Thank you very much
    ([email protected])

  26. wajih siai says:

    Great project. can you please email me detailed picture of the circuit in isis. i will build it. Thank you very much
    ([email protected])

  27. pls send me a detailed picture of the circuit
    my mail id is
    [email protected]..
    as soon as possible please

  28. Anonymous says:

    Can you send the picture to see with detail, the components to buy them? There will be very helpful. [email protected]

  29. is there anyway u can convert this to be used for a pic16f917 programmed through ICD 3 using MPLAB

  30. ian ver calub says:

    pls email me your complete detail of your project.. [email protected]

  31. Anonymous says:

    Can you send the picture to see with detail, the components to buy them? There will be very helpful. [email protected]

  32. Adnan Khan says:

    it's not working on my code blocks..
    this error is shown ,

    fatal error : htd.h : no such file or directory .

  33. Unknown says:

    Good day sir,

    Would be grateful if you could send me the picture to see with detail, the components to buy them.

    [email protected]

  34. Zoniv says:

    Hello, It also provides enable and RS signals to the LCD display. LCD Display is used to display the converted digital binary data to decimal format so that user can easily understand the voltage. And finally Low power quad op-amp is used as buffer and as invert er.Great effort in analyzing. Thanks for the post.

  35. Unknown says:

    HELLO, I NEED THE CIRCUIT DIAGRAM OF THIS CODE.PLEASE GIVE ME CIRCUIT DIAGRAM ON MY MAIL…….([email protected])

  36. Unknown says:

    What's the output if this.
    This is full program

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