I've been looking all over the internet to try to figure out the optimal values for R1, R2, and C but couldn't find info.
I'm trying to ideally make a debouncer that will work with any button on the first white keypad listed from http://www.futurlec.com/Keypads.shtml.
I used 47nF for the capacitor and 2.2K resistors for each resistor but I'm not quite sure if that combo is right. I want the button to respond as fast as possible without debouncing. (like maybe 500uS waiting time between presses)
I then searched for RC calculators online and found two that gave two different results based on the same values I used:
According to http://referencedesigner.com/rfcal/cal_05.php, their answer is 206.800 uS
According to http://sim.okawa-denshi.jp/en/CRtool.php, their answer is 769.60804203044Hz and converting that to time gives me 1.3mS.
Which answer is right? and how do I determine lowest RC delay I should use? The datasheet that comes with the above mentioned keypad does not specify the debounce rate of any of its buttons.