Re: Keypad for Raduino...?
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I built a similar SNA, but control it via USB/tty link from a Raspberry-Pi.
The keypad idea of using a single ADC input to decode keystrokes seems
intriguing to me. This morning I set up the code so it uses a range of voltage
values for each key, and added a time delay for debounce. using a voltage
range window seems to give me latitude enough for using standard value
resistors in the R-matrix. Initially I set up the code to just show the value as
each key was pressed, then rewrote it to use those values as targets.
I divided the difference between voltage values for each key by 2 and used
that to generate the tests for each key. Code is not efficient yet as it is just a
bunch conditionals but once it is working I can go back and make it pretty.
Next question is how much will RF affect the keystroke voltage readings?
This activity is generating some interesting thoughts about possibilities for a
new Raduino design...with OLED display, Keypad, Rotary Encoder, RTC,
Si5351a, and more.
On Sun, Jun 24, 2018 at 11:34 AM Mark Pilant <mark@...> wrote: