New project - MSFS C++ USB interface

[richard]

i see , you need to know the leakage current from the ST gate input to calculate the voltages . after the rc time constant is allowed for of course
seems messy to me , at 100k the button may never work depending on ST characteristics

[Demon]

..., at 100k the button may never work depending on ST characteristics

That's why I tested using a pushbutton and checked the voltage out the RC circuit.

The reading did fall to 0V for all configurations.

[Ioannis]

Better be on the safe side. Richards #91 is the one I would use.

But then you can ditch all that stuff if your ports support internal pull up and just read them in software as described in #86.

Ioannis

[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