Adafruit si5351a arduino

Saturday, November 5, A Simple Si based vfo signal generator for ham radio use [quick start-setting up and general details]. A simple and stable vfo is an integral part for radio experiments. There are several solutions to generate an rf signal Popular ones are : ad dds, Si for amateure use.

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Recently the clock generator chip SiA from Silab is gaining popularity due to its lower cost and ability to generate multiple clock signals For e.

In this article i will briefly take you to quickly build a simple vfo and then gradually improve it with complexities. There are several articles and libraries available with this chip, but to start with i will try to keep it simple. Components Needed. An SiA chip with a simple breakout board.

SiA synthesizer module kit from qrp lab is an example. Those allergic to the word arduino can read it as atmega, basically we need something to talk with i2c on the si, a cheaper solution is an arduino promini from eBay. A simple lcd to show what is going on it can be a digital dial later, i am going to use a 16X2 character lcd with HD A rotary encoder with a click push button to control the whole stuff in a nicer way.

Hence it needs a level shifter and a 3. The good thing is that the current consumption of this clock generator is very low. Pin connection for Si SiA pin layout.

Vdd and Vddo is 3. A simple level shifter use two of them A simple level shifter BS is an alternative. Easy solution SiA module from qrp labs or similar module from adafruit.

Aadafruit si clock generator breakout board. Using a TCXO for making the reference clock more stable.The board layout was done in SprintLayout and I do have some boards being fabbed up in China and should have them here within a week, as I need a few for my own projects.

The only other thing is a rotary encoder. And in all reality, you should be able to do and understand these things anyway, just by reading the code. Please acknowledge them for their work and contribution by emailing them and thanking them. The 3 libraries used are also included in the archive. Place them into your Arduino Library folder. Also read through the code, I have added some comments that will help in getting the thing aligned and on frequency.

Remember every breakout will be slightly different because the xtal will be slightly different so you have to calibrate the SIa to get it perfect. Either send them to a fab house in China, load them into your own software and CNC route or ink transfer and make your own.

adafruit si5351a arduino

The board on the left in the image below is one i made on my CNC router to ensure it is correct and working. The signal out of the SIa breakout can be taken from the 3 pin headers or from the SMA on the board, depending on how you need to deliver the signal into your own project. You can also see that I have used SIP Headers to connect everything, rather than soldering direct to the board.

Adafruit Si5351A 3-Channel Clock Generator

Its always nice to be to able to pill things out if they go wrong. DRL is in the file and it works fine for me. I loaded it up in Flatcam to ensure it contains drill locations and that they align with the pads. The version of code i am using is very changed from what is here. I now have mine doing multi bands and filter switching etc. I think off the top of my head I am using v1. This site uses Akismet to reduce spam. Learn how your comment data is processed. Next Next post: Audio Meter.

Wondering if you made any changes to the sketch. Second question- what version IDE did you use.

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I am using 1. Yeah you dont want these. There are much better solutions out there now. Leave a Reply Cancel reply.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Work fast with our official CLI. Learn more. If nothing happens, download GitHub Desktop and try again.

adafruit si5351a arduino

If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! BSD license, all text above must be included in any redistribution. To download. You may need to create the libraries subfolder if its your first library. Restart the IDE.

We use optional third-party analytics cookies to understand how you use GitHub. You can always update your selection by clicking Cookie Preferences at the bottom of the page. For more information, see our Privacy Statement. We use essential cookies to perform essential website functions, e.

We use analytics cookies to understand how you use our websites so we can make them better, e. Skip to content. Driver for Adafruit's Si Clockgen Breakout 23 stars 17 forks. Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.

Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Git stats 18 commits.

ПРОСТОЙ СИНТЕЗАТОР ЧАСТОТЫ СВОИМИ РУКАМИ

Failed to load latest commit information. View code. BSD license, all text above must be included in any redistribution To download. Releases 4 1. May 29, Packages 0 No packages published. Contributors 5. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.This Instructable describes the construction, and operation, of a stand-alone frequency synthesiser suitable for use as a signal generator, or for use as the local oscillator in an amateur band transmitter or receiver.

My prototype was built on a piece of "Vero" board. The Arduino source code is well annotated and contains links to all of the required "libraries". Construction is not critical. The Si breakout board is designed to run off 5 volts and has an I2C interface which makes it easy to connect to an Arduino. The output level from this synthesiser is approximately 3 volts peak-to-peak.

The second most important component is the rotary encoder which outputs the following two-bit "Gray" code pattern:. The encoder always rests at an indent pattern 11 when the tuning knob is stationary. If the tuning knob is turned CCW counter clock-wise then the pattern sequence between indents is 01, 00, 10, If, however, the tuning knob is turned CW clock-wise then the pattern sequence between indents is 10, 00, 01, This pattern reversal allows us to determine the tuning direction.

The rotary encoder comes fitted with a single-pole push switch which I use to control the tuning step-size in increments of 10,and Hz. A brief push on the tuning knob increases the tuning step-size. A longer push on the tuning knob causes the step-size to decrease. All mechanical switches suffer from contact bounce which makes for erratic tuning. Instead of "debouncing" each switch with hardware I am using a software integrator.

A SPST band-change switch has been included. When the switch is activated it is possible to cycle through each of the amateur radio bands by rotating the tuning knob. The tuning knob behaves normally when the switch is deactivated. Programming the ATmegaP microcontroller is relatively simple.Voting resources, early voting, and poll worker information - VOTE.

Adafruit is open and shipping. Please be positive and constructive with your questions and comments. I am wondering if the outputs are direct or capacitor coupled. From looking at the schematic and the board, it looks like there are 2 ground pads per output. Why two? Maybe I just don't understand the use case. The breed of electronics that probably looks most familiar to you is based on a set of assumptions we call the 'lumped element model' or 'lumped-element discipline'.

The major assumptions are: - energy is only lost as heat in resistors - electric fields only exist in capacitors - magnetic fields only exist around inductors - voltage and current are exactly the same at both ends of a wire None of them are actually true, but the error is usually small enough to ignore, and being able to ignore the errors makes the math a LOT simpler. For a 1GHz signal, the voltage and current do a complete cycle in about 20cm.

Even down in the high megahertz range, signals change fast enough that you can no longer ignore the length of the wire. Fast-moving signals also break the assumptions that electric and magnetic fields only exist in capacitors and inductors. If you twist two wires together, you get a few picofarads of capacitance between them. That isn't much, but when you multiply its effects by a hundred million cycles per second, the results are too big to ignore.

There are similar problems with the few nanohenries of inductance around a wire. The range of frequencies where we can safely ignore all those problems is called the 'quasistatic domain', which literally means 'more or less standing still'. It runs from DC up to a few megahertz, depending on your application. Capacitive touch sensors deliberately break the lumped-element discipline so they can sense changes in parasitic capacitance at a few kilohertz.

Once we leave the quasistatic domain, we have to start compensating for the errors we can no longer ignore. It's impossible to eliminate parasitic inductance and capacitance, but we can control it. The most well-behaved environment for fast signals is a wire surrounded by a grounded tube, with a known amount of capacitance between the wire and the tube.

It acts like a distributed inductor-and-capacitor system called a 'transmission line'. We know that transmission lines degrade fast signals, but we also know how much, and how to compensate for it. Gaps in the tube around the conductor in a transmission line make it stop acting like a transmission line and start acting like a radio antenna.

We can actually locate the position of a gap by pumping a signal into one end of the transmission line and examining the reflections that come back.

adafruit si5351a arduino

Ideally, we'd put the whole circuit inside the tube, but in real life that doesn't happen. We need things like connectors. The next-best physical approximation of a transmission line is a 3-layer PCB: the top and bottom are ground planes, and the center layer has a signal trace with ground traces on both sides of it.

The next step down is a single-layer PCB with just the signal trace with ground traces on both sides. They're designed to fit SMA connectors themselves coaxialwhich will then carry the signal to a coaxial cable. For signals above a few megahertz, you need those kinds of connections. The SiA can go up to MHz, which is well outside the quasistatic domain. I purchased 2 Adafruit SA units. I want to know if I need to add a crystal to them, or if they come with one installed?

I sometimes hate searching because I have COPD, and get tired very easily, just doing nothing at times. The silkscreen on the board says "25MHz Xtal".

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Here is a photo with the crystal marked: Adafruit SiA. You do not have the required permissions to view the files attached to this post.To many, this will be just another Si VFO project, with nothing to distinguish it from the others.

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To me though, it was a complete mystery. I have been very adept, my whole life, at studiously avoiding anything to do with digital electronics, computing, coding, and the like. This seemed like a strangely non-committal response. He was just trying to appear knowledgeable by giving me a non-answer!

Yup – It’s Another Si5351 VFO

This suspicious reaction was quite representative of the way I thought about computers back then. These expensive boxes just sat there, doing nothing, except waiting for instructions. Such a disappointing lack of character! How is one supposed to respect a person or an object that sits quietly in a corner, waiting to be told what do?

How feckless! Dedicated hardware, however, was different. When you bought a radio receiver, you knew that, on twiddling a few knobs and flicking a few switches, it would receive radio signals. A burglar alarm would alert you to the presence of burglars well in theory, anywayand those remote control cars that RS sold by the gazillion were guaranteed to quietly drive your family nuts in the days after Christmas before work, and school, resumed.

Computers, on the other hand, promised everything but actually did nothing, until you told them what to do — and even then, there were a myriad of ways in which they could obstinately refuse to comply with your wishes.

adafruit si5351a arduino

Not for me! And so it was that, throughout my adult years, I deprived myself of exposure to things digital. I am not proud of my incurious nature about many things — though, when I am interested in something, I exhaust myself with the sheer intensity of focus.

The projects I built ran off anything from a few volts, up to V or even more.

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What kind of a voltage was that? They came with a surfeit of incomprehensible nomenclature too. Words that sounded like something John Lennon would have made up for a song post Words like NAND.

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I had a small stash of ferrite rods, variable capacitors, resistors, and transistors, and some 9V battery snaps and with that, I had all that I needed. Yes — I was that closed-minded. A few years ago, a friend generously gifted me a Bare Bones Arduino board. I looked at it, and wondered what to do with it. What did it do? How did it do it?

Arduino Frequency Synthesiser Using 160MHz Si5351

What was I supposed to connect to it? I placed it carefully in a box along with some other electronic things that confused my simplistic analog mind, and carried on with my life. Not that my experience level in this arena was completely non-existent.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.

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