A couple of programming suggestions: For low frequency sources, change pulseHigh and pulseLow from 'int' to 'long'. This prevents them from overflowing and becoming negative. You can see this in action if you print them out with a low freq input. Also you may want to use the optional "timeout" parameter to the pulseIn() function: pulseIn(pin, value, timeout); The default timeout is 1s. So if you are monitoring a signal that is greater than one second long the function will timeout and you will get the wrong reading. Many thanks for the video!
I was bored and looking for something easy to build and it worked fine except for some reason the display would only show blocks and no digits . I changed the pin assignments to match the hello world sketch and it started displaying normally. I'm not great at arduino so not really sure why it wouldn't work for me as it was but It was just a bit of fun to kill time so just glad it worked. Thanks.
Hello and Thanks for your video, you do a great work ! It works for me too, and I changed a bit your code : - Put all value to type "long", as I don't need floating frequency info. - Put the first LCD print line into the Setup(), so I only change the second line (frequency value) into Loop(). - Put delay down to 250ms, in the Loop().
Loved it very informative and explained in a good manner with easy to follow instructions thank you. Is there a way to detect a specific frequency and turn on a led indicator to show that it has been detected, please? Thank you for any help Bob
I use something similar but with some more math to give a readout uf a rotary encoder on the spindle downfeed of my milling machine - it just converts the pulse count per second to feed rate in mm per minute . The extra math is just the reduction ratio in the drive system , i keep having one problem though the display keeps showing these weird symbols that look like martian writing ! It is also intermittent so i don't know what is causing it , maybe electrical interference, maybe a dodgy display or connection - i have no idea so looks like a pull apart job !
Hello; I built an Arduino EMF Detector but i have a problem. The values on the EMF screen are unitless. I see huge numbers like 500.000 , 200.000, 300.000 when an electromagnetic field occurs. Also there is always a constant value just about 50.30, 49.32, etc. 1)I want to see the values as frequency. How can i convert it to the frequency? Is it possible? If it is, could you help me? 2)I use a copper cable as antenna. What is the reason of constant value? Is it because of antenna or because of crircle? Thank you...
Hello Mr David I have made your configuration. It Counts 2000 or 3000 differecy for example one cycle 44.000 kHz, another one 41.000. How is your resultation. Thank you for your programmin and answer.
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A couple of programming suggestions:
For low frequency sources, change pulseHigh and pulseLow from 'int' to 'long'. This prevents them from overflowing and becoming negative. You can see this in action if you print them out with a low freq input.
Also you may want to use the optional "timeout" parameter to the pulseIn() function: pulseIn(pin, value, timeout);
The default timeout is 1s. So if you are monitoring a signal that is greater than one second long the function will timeout and you will get the wrong reading.
Many thanks for the video!
I was bored and looking for something easy to build and it worked fine except for some reason the display would only show blocks and no digits . I changed the pin assignments to match the hello world sketch and it started displaying normally. I'm not great at arduino so not really sure why it wouldn't work for me as it was but It was just a bit of fun to kill time so just glad it worked. Thanks.
Hello and Thanks for your video, you do a great work !
It works for me too, and I changed a bit your code :
- Put all value to type "long", as I don't need floating frequency info.
- Put the first LCD print line into the Setup(), so I only change the second line (frequency value) into Loop().
- Put delay down to 250ms, in the Loop().
hi sebastian...can you send me the HEX file of frequency counter which you upgraded????? please
Very cool and useful! Was just looking at Frequency Counters on Ebay and now I think I'll make my own. Thanks much.
gene guru1 glad you liked it. thanks.
Thanks. That's exactly what I was looking for on the internet 🙂.
Excellent project
what is the ceiling on frequency with this and a arduino uno? I need to measure at around 1 Mhz would this work?
Loved it very informative and explained in a good manner with easy to follow instructions thank you.
Is there a way to detect a specific frequency and turn on a led indicator to show that it has been detected, please?
Thank you for any help Bob
works like a charm thanks for video well explained
Thank you
Thank you Sir. I can check my Arduino Uno's pin PWM. That is around 490 to 492 Hz as stated in its specification with your code. Means a lot.
What is the minimum and maximum frequency this arduino setup can measure? Assuming you use change the timing cap on the 555.
can we use uno instead of nano
I use something similar but with some more math to give a readout uf a rotary encoder on the spindle downfeed of my milling machine - it just converts the pulse count per second to feed rate in mm per minute .
The extra math is just the reduction ratio in the drive system , i keep having one problem though the display keeps showing these weird symbols that look like martian writing ! It is also intermittent so i don't know what is causing it , maybe electrical interference, maybe a dodgy display or connection - i have no idea so looks like a pull apart job !
Thx for thr video!!!
this worked first try and it is as accurate as my DMM within a few HZ
Cool, I'm always surprised when anything works first try lol
Hello;
I built an Arduino EMF Detector but i have a problem. The values on the EMF screen are unitless. I see huge numbers like 500.000 , 200.000, 300.000 when an electromagnetic field occurs. Also there is always a constant value just about 50.30, 49.32, etc.
1)I want to see the values as frequency. How can i convert it to the frequency? Is it possible? If it is, could you help me?
2)I use a copper cable as antenna. What is the reason of constant value? Is it because of antenna or because of crircle?
Thank you...
This little project will not count frequencies
thank you
I have the circuit connected but i always get the inf frequency reading.......please advice
hard to say off hand... are your grounds connected
yes they are connected. can you tell me what you did when you got the inf reading and said" i am going to power the 555"
Mohammad Othman I just applied power. what are you trying to count?
My circuit works now:)...Thanks!!!! your video has been a great help!!
is the LED screen important for the rest of this to work?
No
thanks for answer.
can u plzz send me sketch link a
Hello Mr David I have made your configuration. It Counts 2000 or 3000 differecy for example one cycle 44.000 kHz, another one 41.000. How is your resultation. Thank you for your programmin and answer.
mine seems pretty stable
how much the max. frequency can be count?
+chenamis It's going to Max out in the low GHz, probably around 8-10