What type of capacitor for surface mount?

Using Arduino General Electronics
1

Hi,

If i have a debounce circuit with a 10uF capacitor, 10k resistor and Hex inverting Schmitt Trigger, does it matter what type of capacitor is needed for a surface mounted PCB?

Thanks

2

depends on the resistors you use i guess...

3

Why are you using a Schmitt trigger for debouncing, rather than doing it in software?

10µF is an inconveniently large value - which is of course why you are asking this question in the first place. Combined with a 10k resistor, this gives a response time of one tenth of a second, which means to say you are in no hurry at all and are presumably intending to debounce a manually-operated switch, so if you are using this for a microprocessor input, it would be much easier to get the firmware to do the debouncing.

4

Why are you using a Schmitt trigger for debouncing, rather than doing it in software?

I am only using hardware to wake the Arduino when sleeping, not for any other inputs. That is done in software.

10µF is an inconveniently large value

What would be a better value for the capacitor and resistor?

Thanks

5

Jeffro_Aus:
I am only using hardware to wake the Arduino when sleeping, not for any other inputs. That is done in software.

Then you have no need for debounce.

Have you missed something?

6

Then you have no need for debounce.

Have you missed something?

Maybe i don't need it. Thought it just might be cleaner.

7

Once it is awake, it is awake. Just as long as you are not attempting to use interrupts on the switch inputs (never a sensible idea), you should have no problems.