Arduino Uno Debouncing

More sophisticated debouncing can be performed by a cheap Arduino Uno processor.

Normally the analog debounce circuits perform well, but it is an easy to build project and it provides a side tone generator at the same time.

It needs only a single BS170 transistor and a few passive components.

The transistor is only needed if you want to key a transceiver.

The switch is only needed if you want to be able to switch off the debouncing.

The side tone has to go directly to a PC speaker. Latency is too high on the computer.

If using PCW fistcheck, the side tone has to be supplied to the computer also.

Not only the key down slope, but also the key up slope is debounced!

Added (small) advantage is that the debouncing doesn’t lengthen the dot at the end.

Last update: October 1, 2023