Sonsivri
 
*
Welcome, Guest. Please login or register.
Did you miss your activation email?
December 04, 2016, 07:16:11 19:16


Login with username, password and session length


Pages: [1]
Print
Author Topic: PIC based frequency counter  (Read 1018 times)
0 Members and 1 Guest are viewing this topic.
ehnonymouse
Newbie
*
Offline Offline

Posts: 24

Thank You
-Given: 13
-Receive: 10


« 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.
Logged
towlerg
V.I.P
Active Member
*****
Offline Offline

Posts: 136

Thank You
-Given: 282
-Receive: 48

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
Logged

Win 7 Ult x86 SP1 on HP6910p
PICker
Junior Member
**
Offline Offline

Posts: 75

Thank You
-Given: 28
-Receive: 35


« 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
Logged
ehnonymouse
Newbie
*
Offline Offline

Posts: 24

Thank You
-Given: 13
-Receive: 10


« 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.
Logged
PICker
Junior Member
**
Offline Offline

Posts: 75

Thank You
-Given: 28
-Receive: 35


« 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.

Logged
titi
Active Member
***
Offline Offline

Posts: 192

Thank You
-Given: 1434
-Receive: 705



« 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
Active Member
***
Offline Offline

Posts: 130

Thank You
-Given: 35
-Receive: 25


« 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.
Logged
dR-mR
Newbie
*
Offline Offline

Posts: 12

Thank You
-Given: 15
-Receive: 4


« 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
Logged
PICker
Junior Member
**
Offline Offline

Posts: 75

Thank You
-Given: 28
-Receive: 35


« 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
Logged
Pages: [1]
Print
Jump to:  


DISCLAIMER
WE DONT HOST ANY ILLEGAL FILES ON THE SERVER
USE CONTACT US TO REPORT ILLEGAL FILES
ADMINISTRATORS CANNOT BE HELD RESPONSIBLE FOR USERS POSTS AND LINKS

... Copyright 2003-2999 Sonsivri.to ...
Powered by SMF 1.1.18 | SMF © 2006-2009, Simple Machines LLC | HarzeM Dilber MC