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Author Topic: PIC based frequency counter  (Read 2237 times)
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ehnonymouse
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« on: March 24, 2016, 09:11:42 21:11 »

Does anyone have any information about the PLJ-8LED frequency counters being sold on eBay? They use a PIC16F648A. Are they part of an open source project you recognise and if so do you have any links to code and schematics please? I want to modify one to have three switchable I.F.s but need to understand how it is currently working.
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towlerg
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What is this for?


« Reply #1 on: March 25, 2016, 12:06:57 12:06 »

Don't know about that device but the microchip app note AN592 is the basis.

Something perhaps similar http://homepage.eircom.net/~ei9gq/counter.html
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PICker
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« Reply #2 on: March 25, 2016, 07:07:56 19:07 »

Other similar projects:
http://www.qsl.net/dl4yhf/freq_counter/freq_counter.html
http://www.best-microcontroller-projects.com/pic-frequency-counter.html
http://www.circuitvalley.com/2011/07/60-mhz-frequency-meter-counter.html
http://www.micro-examples.com/public/microex-navig/doc/110-p16f84-freqmeter.html
http://microcontrollerslab.com/digital-frequency-meter-with-lcd-display/
https://sites.google.com/site/vk3bhr/home/fm2
http://www.apogeekits.com/counter_article.htm
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ehnonymouse
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« Reply #3 on: March 28, 2016, 12:30:29 00:30 »

Thanks guys, I have seen a lot of those and some others too, but nothing seems to be up there with this eight digit one.
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PICker
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« Reply #4 on: March 28, 2016, 09:32:36 09:32 »

Hi @ehnonymouse,
the only datasheet I've found for the PLJ-8LED is in chinese language!
http://www.sv1bds.gr/files/PLJ_5110C.pdf
Anyway, several schemes and formulas are clear.

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titi
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« Reply #5 on: March 28, 2016, 05:58:54 17:58 »

Hi ehnonymouse,

in attachment the documentation in chinese for PLJ-8LED-C.
At the end of the document you can found some links.
May be it is possible to use google translate in you native language ?

A Video and PDF for PLJ-6LED-A : https://www.youtube.com/watch?v=1_neC5Z_wEg

I just add an other documentation in French.

And this is a duch site : http://www.rudiswiki.de/wiki9/FrequenzZaehlerLED

And some other documentations : http://pan.baidu.com/share/home?uk=369802936#category/type=0

Best regards.
« Last Edit: March 28, 2016, 06:27:14 18:27 by titi » Logged
Vineyards
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« Reply #6 on: March 28, 2016, 11:18:55 23:18 »

I think, now that you are looking to get such an extended resolution and accuracy, you need two things:
1- A reliable, low ppm crystal with a frequency calculated to match your desired specs.
2- Assembly coding which takes into account the time it takes for every little command to be processed by the mcu.
We could add to that the need for premium components and a careful circuit design taking into account interferences etc.

Zuisti is the master of this art as far as I can remember. If he is around he can give you a few tips. I built a frequency counter some 5-7 years ago but I was not targeting that much precision.
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dR-mR
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« Reply #7 on: March 28, 2016, 11:48:47 23:48 »

This one is from silicon chip magazine
2.5Ghz 12 digit resolution
http://www.radioradar.net/en/measurements_technics/2_5_ghz_12_digit_frequency_counter_with_add_on_gps_accuracy.html
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« Reply #8 on: March 29, 2016, 08:02:40 08:02 »

I do not know if this is out of topic, but, referring to the Vineyards post, several links and/or appnotes may help in the development of an accurate frequency counter:
http://www.keysight.com/upload/cmc_upload/All/measurement_error.htm?&cc=IT&lc=ita
http://leapsecond.com/hpan/an200-4.pdf
http://www.ni.com/white-paper/3619/en/
http://www.techni-tool.com/site/ARTICLE_LIBRARY/Agilent%20-%2010%20Hints%20for%20Getting%20the%20Most%20from%20Your%20Frequency%20Counter.pdf
http://www.sitime.com/support2/documents/AN10033-Frequency-Measurement-Guidelines-for-Oscillators.pdf
http://cp.literature.agilent.com/litweb/pdf/5967-6038E.pdf
http://cp.literature.agilent.com/litweb/pdf/5989-1592EN.pdf
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ehnonymouse
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« Reply #9 on: February 08, 2017, 01:54:42 13:54 »

titi - PLJ-8LED-C.pdf looks very useful, and dR-mR, thank you for http://www.radioradar.net/en/measurements_technics/2_5_ghz_12_digit_frequency_counter_with_add_on_gps_accuracy.html - it looks really useful.
Thank you to everyone who has replied.

The forum links in PLJ-8LED-C.pdf look really interesting, but I don't know Chinese. I have a friend who does, and he's back from Chinese New year holiday on Monday, so I may get some progress there. Specifically I'd like source code that I can modify.
 
I'm sorry there has been such a long delay in replying but a friend was diagnosed with terminal Cancer, so spare time has been spent supporting him. He died and I'm trying to sort out his estate. Life has been pretty much on hold for a year and still isn't back to normal. Profound apologies.
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titi
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« Reply #10 on: February 08, 2017, 07:53:40 19:53 »

Hi ehnonymouse,

I found some new information about PLJ-8LED-C.

Here is an English documentation and Schematics of the Counter.
Best regards.
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sadman
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« Reply #11 on: February 09, 2017, 06:55:50 06:55 »

Hi ehnonymouse,

I found some new information about PLJ-8LED-C.

Here is an English documentation and Schematics of the Counter.
Best regards.

where to find hex or programing files
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Xaby
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« Reply #12 on: February 12, 2017, 11:22:18 11:22 »

You won't fiind hex for it.
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ehnonymouse
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« Reply #13 on: July 02, 2017, 10:30:46 22:30 »

I've been having problems with this. I have worked out the schematic, but it seems the timer used in the PIC needs to somehow synchronise with the PIC clock. The result is that if the PIC is running with a 13MHz clock (as supplied from China), putting a 10MHz signal in results in a count of 3MHz. The original as supplied counter will count to 1Hz resolution a 10MHz signal with a 1s gate time.

Any ideas how they manage it?
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Old_but_Alive
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« Reply #14 on: July 03, 2017, 08:35:52 08:35 »

The manual for the PLJ-5110C looks a nice item.
Unfortunately, there are no google hits.

anyone know where it is available?
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titi
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« Reply #15 on: July 03, 2017, 10:24:27 10:24 »

Hi,

This Chinese document give schematics and other explanations, may be it can help you.

http://www.sv1bds.gr/files/PLJ_5110C.pdf

Best regards.
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Old_but_Alive
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« Reply #16 on: July 03, 2017, 06:04:35 18:04 »

that was the document i looked at, so no bloody help at all
« Last Edit: July 03, 2017, 06:46:29 18:46 by Old_but_Alive » Logged

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