Generic Crystal Replacement Test VFO

[VK3ZYZ]

I am working on a version of the VFO to allow setting up misc radios.
It will have adjustable signal frequency, IF frequency, TX multiplier and RX multiplier.
This will be based on an ESP8266 and the encoder display mentioned in..
http://www.sadarc.org/xenforo/upload/index.php?threads/learn-arduino.261/page-7 post #123.

So far, this will be the running display.

 

[VK3ZYZ]

A trouble I had was the ESP8266 repeatedly resetting.
It turns out I was using pin numbers wrong..
For example, digitalWrite(7,OUTPUT); would crash the board.
The fix, digitalWrite(D7,OUTPUT);
The "D" was missing!

I finally have the encoder working, sort off, but there is still lots to do.
This is a handy place to back up my code

Here is the code so far, and the encoder lib.

 

[VK3ZYZ]

I can now set the parameters for the required radio. But there is some problems with the code as it times out and resets the ESP8266 when in the editing mode.
When I get it going, maybe someone with good programming skills can look at it and fix the code!

 

[VK3YNV]

I had a quick look, and I guess the encoder interrupt code is somewhere else.
In any event be wary of reading encoder position from outside the interrupt routine, you can get weird timing rollover errors.

 

[VK3ZYZ]

It looks like the reset crash is fixed.
At the end of each loop, I added a delay so the ESP8266 has something to do.

          while (digitalRead(Up_SWITCH)== LOW)
          { delay(10);} // wait for key up
        }
        delay(1);
    }

Oh, Ray, I renamed the "EXIT()" to "BackToMainLoop()"

 

[VK3ZYZ]

Here also are the stl files for the case.
2 buttons are needed.

 

[VK3ZYZ]

 

[VK3ZYZ]

EDIT: I have made it battery operated and removed the connectors.
So here is the real circuit.

It works
(the o/p coupling caps are now 100nF, not 100pF)

 

[VK3ZYZ]

On this first one, I think I will add a charger and 18650 battery to make it portable.
There is a first try of a lid for a Jaycar BH6011 box on the 3D printer.

EDIT:
I have printed the first version but decided to change it to this one, And now it is printing (3 hours).

 

[VK3ZYZ]

The prototype wiring was just birds nest.

Then the 3D printed front was (finally) done!
Mounting the Si5351 board.


Then the rest of it...


And the finished unit running on the 18650 cell.

I have yet to add the external "PTT" line but the encoder button also works as the PTT.
And I need to update the circuit as it now has a USB Micro charging port and a single 18650 for power.

EDIT: I have added a 2 pin connector on the front for TRX input. Not shown on this photo.

 

[VK3ZYZ]

Here is a quick info sheet.

EDIT 20250514. Updated the manual.

 

[VK3ZYZ]

I have found the encoder routine in use is very flakey so I'm trying to write one that works reliably.
FIXED
After playing around with lots of stuff that did not work, it turned out to be very simple.

attachInterrupt(digitalPinToInterrupt(ENCODER_A), EncoderISR, RISING);  //call encoderISR() every low->high changes


void ICACHE_RAM_ATTR EncoderISR()
{ noInterrupts();
  if (digitalRead(ENCODER_B)==HIGH)
  { counter++;}
  else
  {counter--;}
  interrupts();                     //enable interrupts
}

Also here is my 3D print.