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➜ Electronics
➜ Microprocessors
➜ Frequency counter
Postings by administrators only.
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| Posted by
| Willy
(4 posts) Bio
|
| Date
| Wed 23 May 2012 12:29 PM (UTC) |
| Message
| | Hello, Nick! Thanks for your job! I have tried your frequency counter sketch for Atmega328. I have modified slightly the code for my purposes to use LCD display and pre-scaler 1/10 with 74HC4017. It works fine up to 70MHz, however on high frequency's LCD shows 69.999 instead 70.000 MHz, but I don't need hight resolution, only 1KHz. | | Top |
|
| Posted by
| Nick Gammon
Australia (23,070 posts) Bio
Forum Administrator |
| Date
| Reply #1 on Thu 24 May 2012 01:53 AM (UTC) |
| Message
| OK, great! I see that the 74HC4017 divides stuff down for you.
So is that a question? Or are you just saying how well it works? |
- Nick Gammon
www.gammon.com.au, www.mushclient.com | | Top |
|
| Posted by
| Willy
(4 posts) Bio
|
| Date
| Reply #2 on Thu 24 May 2012 05:45 AM (UTC) |
| Message
| | Hi, the question is how can I do that the frequency will be displayed with hertz separated by "." like "70.000.00"? | | Top |
|
| Posted by
| Nick Gammon
Australia (23,070 posts) Bio
Forum Administrator |
| Date
| Reply #3 on Thu 24 May 2012 06:03 AM (UTC) |
| Message
| You want a "thousands separator"?
Not sure of an easy way to do that. sprintf the number, and if it is larger than 1000 throw in a comma. This is just a formatting issue. |
- Nick Gammon
www.gammon.com.au, www.mushclient.com | | Top |
|
| Posted by
| Willy
(4 posts) Bio
|
| Date
| Reply #4 on Thu 24 May 2012 07:04 AM (UTC) |
| Message
| I do like this
float frq = timerCounts * 10.0 / timerPeriod;
frq = frq / 1000.0;
lcd.clear();
lcd.print (" F = ");
lcd.print (frq,3);
lcd.print (" MHz");
and display shows "F = 70.000 MHz" | | Top |
|
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