Friday, September 18, 2009

LC meter (PIC16F876A & N3310LCD)

Inductance/Capacitance meter using PIC16F876A and Nokia 3310 LCD.
..as inspired by these two projects:
A Surprisingly Accurate Digital LC Meter
Digital LC Meter Version 2




Schematic:
demo:


source code: LC meter pic16f876A (initial) 032609.rar
(*contains basic functions but not anymore updated)

##########################################################

edit(01-01-10):
source code with MPLAB(8.4) Project (*.mcp):
LC meter pic16f876A (diagram and source code).rar

generated hex using HI-TECH C Compiler v9.63:
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65 comments:

  1. Hi Yus, I like your projects and I'm trying to build an LC meter like your. I made the first one on a bread board but I found a problem between the two comparator. To make the oscillator working I need to insert a resistor (about 56KOhm) between RA5 and RA0 but in that manner the edges at the output of the C1 (on RA4) comparator are not very good. I tryed another working solution connecting direcly the output of C2 (RA5) into the T0CKI/RA4 pin and removing the pull up resistor R5, but I'm not sure that's good for the health of the pic. What do you thik about? I'm using a 16F876A DIP. Thank you very much.

    ReplyDelete
  2. hi Roberto,
    thanks for your interest on my projects.
    regarding your concern, there should be no problem with inserting a 56k resistor between RA5 and RA0 (but I haven't tried this on actual my circuit).
    Your second solution seems to be a good one. (And I'm actually revising my circuit, as well as the code, to use only a single comparator). But, you're correct, there will be problem inside the PIC with the present code if you connect the RA5 directly on RA4; because in the present code, there are times that both RA5 and RA4 are set as "output pins" (worst is when RA5 is high & RA4 is low).
    Hopefully in my second revision, there will be no problem with the internal comparator since I'm going to use only one. I'm also planning to use Timer1 peripheral, in stead of Timer0 on RA4, as the LC oscillator frequency counter.

    ReplyDelete
  3. I liked your project, but it does not work for me, I cannot make a file of an insertion. If it is possible to send me ready HEX for insertion PIC16F876A. Thanks

    ReplyDelete
  4. hello,I have problems compiling the programs...can you send me the hex file for the LC meter..thank you so much.. my adress: bogdanlucian2000@yahoo.com

    ReplyDelete
  5. hi there Jaroslav and "anonymous",
    I've already posted the HEX code above.
    Just copy it to your text editor, like notepad, and save it as *.hex

    ReplyDelete
  6. Hello Yus
    Can you add a schematic with all pcb wiring include power source, at movie is a led show working meter is it connect to power source ??

    If you can please show pcb project

    What did you use Reed Relay can i use one of this: DIP12-1A72-12D or DIP12-1A72-12A.

    Diode D1 what is it, Can you write value ?

    igor_corp@tlen.pl is my mail

    ReplyDelete
  7. lgorek,
    Currently I'm revising the PCB layout for this project. The previous one was a mess (i.e. has reworks and jumper).

    I forgot the exact part number of the relay,
    but it should be a 5volt reed-relay.

    For diode D1, any fast switching diode can be used, like 1N914 (I used BAS16 SMD type).

    ReplyDelete
  8. Hi, I built your lc meter but I can't calibrate it. I noticed that your diagram has some modifications.... Please, if you want, send me an email with the final diagram, the one that works. My email is marokanu2003@yahoo.com. One more thing: in the diagram I found on the website, in order to get the LCD working, pin no 8 and 4 must be reversed.
    Thanks; I'm waiting for your reply.

    ReplyDelete
  9. Draft layout (proteus) of my first build for this project: http://www.4shared.com/file/223183895/cffcbc82/LC_meter_schem__layout__DRAFT_.html

    ReplyDelete
  10. Yus
    Can send me a hex file becouse when i want to write from the page iprog show a problem in first line.

    igor_corp@tlen.pl

    ReplyDelete
  11. Hy there,i like this project,but i have one problem with the display unit..dosent work but my scope tell me the exchange of data(display)its good,can you send my something regarding this..iulianb25@yahoo.com....tanks.

    ReplyDelete
  12. Please tell me how to compile LC meter pic16f876A (diagram and source code).rar
    When i try to compile,appear lot's off error.A use H-tech 9.60,9.70,and I can't find version 9.63
    Best regards from Serbia
    Bracoch

    ReplyDelete
  13. Bracoch,
    it should compile also with versions 9.6 and 9.70
    MPLAB project file(*.mcp) is already included there. So, you can just open it with MPLAB IDE (w/ hi-tech c compiler).
    regards,
    yus

    ReplyDelete
  14. What is the range of measured capacitors in your device?

    (RUS)Каков диапазон измеряемых конденсаторов в вашем приборе?

    ReplyDelete
  15. Hello again.I succes compile program,but when I simulate in proteus,logo is ok,but Your initial "YUS",it shows in first line,as the set "lcd_gotoxy(0,0);" in program "lcd_gotoxy(40,5);".
    Also behaves "capacitance,inductance and progress bar,too.If there problem in simulation,or something other.
    My other project work's fine when I simulate.
    When I compile this warning mesage it shows:
    "Warning [1352] D:\elektronika\projekti\LC meter pic16f876A (diagram and source code)\display.c; 1168. truncation of operand value (0x100) to 8 bits"
    regards,
    Bracoch

    ReplyDelete
  16. Hi
    I build this LC meter, but have a problem, measurment inductor displaying duoble value, like : real value 150uH - display value 310uH .Capaticance displaying ok.I use hex file from this page.

    Best regards
    Mickey.

    ReplyDelete
  17. Write measuring range of this instrument??

    ReplyDelete
  18. Hi again
    I download MPLAB V8.46 and use LC meter.mcp to make hex file, but with this hex file measure capaticance not work ,i dont know why, and measure inductance again displaying double value. I make change in main.c :"Lin = (numerator/denominator) * 1E15" to "Lin = (numerator/denominator) * 1E15/2" and now displaying measure inductor its ok.

    Best regards
    Mickey.

    ReplyDelete
  19. Hi Yus!
    Im from vietnam. ur work is great, it useful for me. i have this link for u, i hope ur work like that.
    http://www.rfcandy.biz/communication/imp_lc.html

    ReplyDelete
  20. Mr Yus thanks a lot
    but, I connect this circuit but it doesn't work
    I tried to use many LCDs and PICs But it doesn't work.
    So, I want the exact component that u had used in the project in video and any change in diagram and new hex code.
    thanks

    ReplyDelete
  21. can i use any type of lcd screen?

    ReplyDelete
  22. hey yus

    do you think you could sell me one of this lc meter.
    let me know, this is my email address sirbrianmay@hotmail.com

    randy

    ReplyDelete
  23. Hello, looks like the host website is not working and I can't download the source code. Can you upload somewhere else or send by this address : yo9hnh_ham_radio@yahoo.com

    Thank you,
    Robert

    ReplyDelete
  24. I bought 3310 LCD and interface it. using 1117 transistor. the hex file have a problem. the display is not on the center of the screen.

    ReplyDelete
  25. YUS,
    replace the relay by IRLML6402 a P channel mosFET with very low ON resistance and change the gate drive control accordingly.
    it is cheap enough. you might also try with NTD3055 an N-Chl MOSFET.
    without changes to software.

    regards
    sarma

    ReplyDelete
  26. Hello, I made the PCB by schematic and it doesn't work. Then I find error into schematic, pin 12 and 14 are swapped!!!!!

    Regards Hawelson http://hawelson.blog.cz/

    ReplyDelete
  27. Hi and thanks, i like this..

    ReplyDelete
  28. related project:
    http://projectproto.blogspot.com/2010/10/pic18f-usb-lc-meter.html

    ReplyDelete
  29. Hello. Has collected this device under the scheme resulted above. An insertion too from here, has copied in a notebook, has appropriated expansion.HEX. Unfortunately doesn't work. The indicator - original Nokia 3310. In what there can be a reason? Installation is checked up, программатор PICkit 2. An error in the scheme, or an insertion?
    Excuse, it is machine translation, I Russian.

    ReplyDelete
  30. Nice project, I am currently trying to make one myself. Can you please explain in a few words how the analog part of the circuit works? Here is what I think so far: I understand there is an LC oscillator with L1, C1 and our external component (L or C), that Ccal is only used when calibrating, C2 removes the DC component and the R1-R2 voltage divider centers the waveform around 2.5V (although I don't understand why) but what does R3-R4-C3 do with those comperators?

    ReplyDelete
  31. Nice project YUS. I built your project and not work yet. I managed compiled with MPLAB and made the changes in the pins 8 and 4, but I changed the software and the compiled hex file were success. The display worked and the calibrating process it seemed not working correctly. Is it possible to send me the corrected source files or the hex files you have this project working? My email is cfocosta@gmail.com . You know your project is very useful and several people is interested in build this one. Thanks a lot for your attention.

    ReplyDelete
  32. Hi Yus,
    I like your project and intend to build myself one. Going through the forum I noticed some hitches experienced by some. Can you advise me where can I download the updated version after taking into consideration all the current hitches.
    Thanks

    ReplyDelete
  33. great project
    i need the pcb to do one for myself

    ReplyDelete
  34. Great Work
    need project pcb
    my e-mail :
    mahmoud_ahmed_92@yahoo.com

    ReplyDelete
  35. I would ask for file hex
    grzegorz.d3@wp.pl

    ReplyDelete
  36. Has anyone built this project, i have a problem with teh LCD ... it dosent light up ...

    Can anyone help me ?

    phoenix_fm@yahoo.com

    ReplyDelete
  37. LCD problem solved

    ReplyDelete
  38. hello yus i have problem in proteus program i need file bas and thank you

    ReplyDelete
  39. I Hello Yus
    Liked your project, but it does not work for me, I cannot make a file of an insertion. If it is possible to send me ready HEX for insertion PIC16F876A the last verion.my adress: sad.vlad@tut.by
    Thanks

    ReplyDelete
  40. Hello Yus
    Liked your project, but it does not work for me, I cannot make a file of an insertion. If it is possible to send me ready HEX for insertion PIC16F876A the last verion.my adress: ans_ali20009@yahoo.com
    Thanks

    ReplyDelete
  41. Hello, Yus.
    Very fine your project, but it does not work for me, I cannot make a file of an insertion. If it is possible to send me ready HEX for insertion PIC16F876A the last version.
    my adress: ly2bok@gmail.com
    Please see my home page. http://www.qrz.lt/ly2bok
    Thanks

    ReplyDelete
  42. What is measurement range of capacitors and inductors ?

    ReplyDelete
  43. hello, nice work...can i use pic16f873a for this project with your source code? thanks

    ReplyDelete
  44. Good Project and informative blog.

    Code is not downloadable now, Please share the code.

    Thanks
    -Raghavendra

    ReplyDelete
  45. Hi I am 4S6GGS Gayan Code is not downloadable now but i start the project

    ReplyDelete
  46. Hi,i like your project,i made it,but it dosent work.i chcked everythins several times,i couldent find any mistake,please let me know what mistake i made,is it fuse bite or soething else please help me i like you project.

    thanks farhang

    ReplyDelete
  47. Hello Yus

    Can you send me a schematic with all pcb wiring include power source and hex file?
    (from your video)
    My adress is trgoden@gmail.com

    ReplyDelete
  48. You have done a brilliant job making sure that people understand where you are coming from.

    BioTech Patent Agent

    ReplyDelete
  49. sir,
    plz send me hex file tazn1985@gmail.com
    thanks.

    ReplyDelete
  50. can u send jpg to my e-mail back of the lcd panel i need to see how u did soldered it pls send me

    ReplyDelete
  51. my e-mail is manoj_srilanaka@hotmail.com

    ReplyDelete
  52. hallo YUS this project schematic is bad please send me a good schematic and hex.file my lc meter no meas.my email is: radovan.mlynarik@centrum.sk thanks
    PS you reed sometime this forum? I purchased all new component for this project and dont work.
    sorry my england.

    ReplyDelete
  53. hi..do you can buy the pcb?

    ReplyDelete
  54. Hi, I like it so much!
    Could you help me with code
    for Nokia 1100 lcd?
    I don't know how made code.

    ReplyDelete
  55. This comment has been removed by the author.

    ReplyDelete
  56. I built this with the pins 4 and 8 on the display conected the right way, used tantal capacitors for c2 and c3 (recommended)
    , and inserted the hex from the top. It still doesent work, there are no shorts. That is for the oscilator atleast, the display however works. Btw the circuit only turns once on every 3 tries. Is it my pic burner the pic or the board to blame ?

    ReplyDelete
  57. hello, nice work...can i use pic16f873a for this project with your source code? thanks

    ReplyDelete
  58. sir,
    plz send me hex file p84vish@gmail.com
    thanks.

    ReplyDelete
  59. Hi Sir,
    Please sen me hex file alis.tino@tiscali.it
    Many thanks

    ReplyDelete
  60. This comment has been removed by the author.

    ReplyDelete
  61. Crowntnm is Manufacturer and Supplier High Voltage Breakdown Tester, DC regulated power supply, Digital Micro Ohm Meter & LED Testing Instruments provider in Delhi-India. www.crowntnm.com

    ReplyDelete
  62. crown electronic systems is Manufacturer and Supplier High Voltage Breakdown Tester, Digital Micro Ohm Meter & LED Testing Instruments provider in Delhi-India, We are best online DC regulated power supply, Multi function Meter, Digital Measuring Instruments. +91-9873662332

    ReplyDelete
  63. PLEASE HELP.I MADE THE CIRCUIT BUT ITS NOT READING PROPERLY.

    ReplyDelete