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Barry,

Two 0.1 uf capacitors on the encoder board are WAY much simpler!

Barry

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Sent from for Windows

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From: Jack, W8TEE via groups.io
Sent: Monday, February 26, 2024 1:44 PM
To: [email protected]
Subject: Re: [BITX20] sbitx encoder contact bounce

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I understand now.

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Jack, W8TEE

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On Monday, February 26, 2024 at 10:37:26 AM EST, Ashhar Farhan <farhanbox@...> wrote:

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Jack,

In the sbitx, the encoders fire interrupts and measure the time through millis(), it is a wrapper around utime()

- f

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On Mon, Feb 26, 2024, 8:48 PM Jack, W8TEE via <jjpurdum=[email protected]> wrote:

My experience is that debouncing in software can vary from encoder to encoder. I would suggest creating symbolic constants for each encoder (e.g., tune, volume, etc). Usually, the delay is between 40 and 100 milliseconds:

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#define TUNE_ENCODER_DELAY??????????? ???? 50??????? // debounce delay in ms

#define VOLUME_ENCODER_DELAY??????????? 40

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and then look where to place them in the code. Many programmers use the standard delay() function call:

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delay(TUNE_ENCODER_DELAY); ?????????? ????

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However, the delay() function is a "blocking" function, which means that it turns off interrupts for the delay period. Given that debounce functions have relatively short delays, this probably isn't a problem in this code body. However, perhaps some functions [e.g., MyHairsOnFire()] shouldn't be blocked. In that case, I would suggest:

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/

? Purpose: to cause a delay in program execution

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? Parameter list:

? ? unsigned long millisWait ? ?// the number of millseconds to wait

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? Return value:

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/

void MyDelay(unsigned long millisWait)

{

? unsigned long now = millis();

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? while (millis() - now < millisWait)

? ? ; ?????????????????????????????????// Twiddle thumbs until delay ends...

}

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The millis() standard Arduino function is non-blocking, otherwise it acts the same as delay(). I try to use the style shown above. I use a starting capital letter for the function name and Polish notation because most standard and function library names in the Arduino IDE start with a lowercase letter. That way, I know in advance whether I wrote the code or it comes from a library I didn't write.?

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Also, the details about the function always falls in the function header between the "/" and the "/" followed immediately by the function signature (e.g., void MyDelay(unsigned long millisWait) and a newline character). By rigidly following the function format, I wrote a program that looked for the "/" lead-in and then used the __FILE__ and __DATE__ standard macros to create a user document that detailed all of the function calls we wrote for the project. When I had my own software company, I gently convinced all of my programmers to follow this format. Anyone who used a different format had to buy beer and pizza for the programmers the following Friday. I don't remember anyone buying lunch more than once, which kept the project documentation for the code up-to-date.

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Sorry for the long answer, but conventions can make projects with multiple coders easier to use.

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Jack, W8TEE

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On Monday, February 26, 2024 at 07:23:58 AM EST, Ashhar Farhan <farhanbox@...> wrote:

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The debouncing of the encoders is done in software, not hardware. This is the first time I have heard of a bounce problem anyway.? Take a look at the encoder code you could tweak it to increase the debounce time.

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On Mon, Feb 26, 2024, 6:14 AM barry halterman <kthreebo@...> wrote:

Hi, I put the capacitors on the underside of the encoder board. Each capacitor (.1uf) goes from? the phase A and B pin, to the encoder housing grounding trace.

Plenty of room to incorporate these.

Barry

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Sent from for Windows

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From: Scotty R
Sent: Sunday, February 25, 2024 6:45 PM
To: [email protected]
Subject: Re: [BITX20] sbitx encoder contact bounce

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I am interested to know where you placed the capacitors. Can you show a drawing perhaps?

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Scotty

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On Sun, Feb 25, 2024, 3:18 PM barry halterman <kthreebo@...> wrote:

lately I have noticed some contact bouncing with the main encoder when tuning my sbitx. My display frequency would bounce back and forth. I noticed, on the schematic, that there are no capacitors to clean up the noise from the rotary encoder. I installed two .1uf caps on the encoder board and that took care of my issue. Have not noticed any problems with the multi function encoder though.
73
Barry?

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--
Jack, W8TEE

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Jack, W8TEE

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