New project - MSFS C++ USB interface

[richard]

the pull down resistor is a bad idea, the hackaday article [if you wish to trust it] does not have one and does not suggest one.
biasing cmos inputs to values inbetween logic high and logic low thresholds is a proven method for making oscillators , i would not recommend it as a debounce cct. the input pin in the article is never in a floating state regardless of button state, unused cmos input pins cannot be left to float, a completely different thing

[Ioannis]

I guess you refer to post #89. There are no pull downs. It was a graphic design error that meant to be a capacitor, as designated by the letter C.

Ioannis

[Demon]

the pull down resistor is a bad idea, ...

Thanks for keeping an eye open for me. It's now removed.

"Wat waz messa tinking." - Jar Jar

[Demon]

There's a god discussion on Reddit about JLCPCB.

https://www.reddit.com/r/PCB/comment...than_everyone/


- I remember a time when Made in Japan was a joke, and then they joined the leaders in electronics.

- I remember a time when Korean cars was ridiculed, and now they made products that compare or surpass American models.

- I remember a time when Made in China meant cheap crap that broke easily, and now they are rivaling and even beating some North American PCB fabricators.

We keep sitting on our laurels while the planet passes us. I really want to encourage local businesses, but it's becoming impossible at these prices.

[richard]

This cropped up recently on arduino forum as a debounce in noisy [automotive] enviro as an effective debounce method

[Demon]

This cropped up recently on arduino forum as a debounce in noisy [automotive] enviro as an effective debounce method

Yeah, I've saved an article from February 2020 about this one too:

https://www.eejournal.com/article/ul...bounce-part-3/


I had even tried it without success, but I used a breadboard and that most likely caused me a ton of bad connections. This last batch I got from AliExpress leaves a lot to be desired.

[Demon]

The reason why I'm sticking with the Hackaday design is because the front end is recommended by Bourns with their rotary encoders (page 3).

https://www.bourns.com/docs/Product-...ets/PEC11R.pdf


I figure if they can recommend this design with their products, it's gotta have some merit when you consider how easily liability lawsuits get thrown around in the US.

Unless I'm mistaken, the Elliot Williams design from Hackaday that I'm using is exactly the same, but with the Schmitt Trigger added at the back end.


About that other technique of just storing the state in a bunch of bits, and then checking for a "clean press", Elliot encountered a problem with a "janky button".

https://hackaday.com/2015/12/10/embe...i/#more-180185

[Ioannis]

If a button has serious problem, it has to be replaced.

The usual, normal behavior of a metal contact switch is to bounce a few ms and then settle. That is why a 10ms debounce is most recommended. More may be better if you can spare the time, either in software or hardware.

In your case, with so many buttons, you will be using too many components. All these can be just fine be replaced with a few more lines of code for free. And with less posibility for a component or soldering it ot pcb to fail.

Ioannis