How to Calibrate the Si5351 on the Arduino Platform
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- Опубликовано: 18 янв 2024
- In this video I go though how to calibrate the si5351 breakout board using the Arduino platform. I go through why we need to calibrate the clock generator and demonstrate what happens if the Si5351 is not calibrated.
You will need a frequency counter that is in reasonable calibration with a resolution of least to 10th of a Hz but 100th of a Hz resolution is better.
If you run into any problems leave a message in the comments and either I or members of the channel try to help.
In this video I am using the Etherkit library by Jason Milldrum.
For further information regarding the Etherkit library can be found on Github.
Link
github.com/etherkit/Si5351Ard... 
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Thanks very much for your channel. It's one of my favorites.
An aside, I hear you often doing what many others do, (including a close friend of mine who is an EE,) and refer to frequencies in 'hurt', whereas cycles per second are named after H. 'Hertz', so all frequencies should be spoken of as 'Hertz', not 'hurt'. I'm not sure what quirk of the mind causes so many to mispronounce the word so often, but there it is.
Hi John. Yes it's a bad habit of mine, I seem to know this but I it pops out when I am really trying to say Hertz, LOL. John Hurt, famous actor known for Alien, Heinrich Hertz, famous German physicist who discovered radio waves. I guess it's because "z" sounds like an "s" in English confusing a plural meaning. It's great to hear that you are enjoying the channel. I hope to have the next video uploaded in the next few days "Part 3 How to Build and Code a VFO". I have had some PCB's made up for the project which I plan to make available to people who wish to build the project, I am just waiting for the delivery. Best Regards, John M0XFX
Awesome work. Can't wait to see part 3 of the series!
Thanks for comment, it's great to hear that you are enjoying the series. Part 3 should be out this coming weekend. Best Regards John
Thank you !
Im on board!
Lovely work mate
excellent John nice video well back to work
I literally wasted *hours* yesterday when I realised something was *occasionally* a bit off off this this board. I was using the Adafruit library on an ESP32 but I think I'll switch to the EtherKit one now; thanks for the video! 👍
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Hi, Yes without calibration these boards certainly do have frequency stability issues. I can't comment on the Adafruit library as I have not tried it. The ESP32 is a great dev board and the Etherkit library will work fine on that platform. I make these videos through my own experiences in the hope that it's helps others. I am glad you found the video helpful and good luck with your project.
Excellent video, tutorial and effort to share = thank you! I am not a coder, at all, but I would think that a correction algorithm could be simply determined for each individual Si5351 unit and that it could be rather easily coded in... If the offset fault is linear over the entire bandwidth, then... Measure the offsets at the low and high ends of the range, subtract the low frequency from the high frequency, to determine the effected bandwidth... Divide the offset fault value by the effected bandwidth, to determine the correction factor, per Hertz. Code in this correction factor... Or, some other such means... I hope I said that clearly; it is very late at night. Anyway, cheers!
Thanks, John! I have a bad 20.2752 MHz oscillator in my TRS-80 Model 4 which nobody seems to make any more. I was looking at using this chip and learned about that easy to use library from this video. I was hoping a working sketch would fit in an attiny85... and... Miraculously, just setting the frequency with a correction factor comes to 8160 bytes... I'll have a whole 32 bytes of flash left. This means no bootloader, but that just means it'll start up faster. haha!
Hi, It's great to hear you have your TRS-80 back on frequency. Yes that's right if you only need a fixed frequency then just correction is that is needed. Thanks for the comment, best regards John M0XFX
Nice demo, thank you. Sorry for being pedantic, but Hertz is the name of a person (Heinrich Hertz), it's not the plural of Hert. :)
Haha, I'm sorry, you are correct. This has been a long-running joke with some of my viewers, playing on words involving John Hurt, the famous actor, and Heinrich Hertz, the physicist known for his work with electromagnetic waves. It all started with Michael Faraday and the unit of capacitance, the Farad, which is commonly referred to in plural as Farads. For example, people often say "10 microfarads." Should it be Farad or Farads? Hertz or Hertzs? I realise this can be confusing, so I will stop doing it. Thank you for pointing it out.
John...how is that new DDS board you designed and showed a month or two going ?..any further developments?
Hi, Yes it's about there, I'm just waiting for the final PCB's to arrive. I will be making a video in the next few weeks.
@@M0XFXUK By the way I am enjoying this series you are doing now too.
are all si5351 chips different to callibrate or can I just use your calibrating offset? because I dont have a frequency counter.
Hi, The issue isn't the si5351 it's the crystal for the oscillator. You only have to carryout the calibration once to get the figure. Keep an eye on the channel as I am thinking of supply some SI5351 boards with the calibration figure so you don't need a frequency counter.
@@M0XFXUKI, for one, would welcome that! I have 1 SI5351 Breakout board, and will be looking for another in the near future!
Hi here... Can I use this example for an ESP32 DEV setup, if so what should I do? I am a bit of a novice in the field 🙂.
Hi, Yes the cal routine sketch should run on the ESP32 and will work as per the video. If you have an ESP32 you will need to configure the Arduino IDE to work with it. Keep an eye on the channel, I have a video coming soon on how to do this.
Thanks for the answer. so I'm looking forward to when you post it 🙂🙂.@@M0XFXUK