Technical overview: Rotary encoder based cooking timer

A look at the UI modeling and electronics/software (explain the scope waveforms towards the end) behind a cooking timer controlled by a rotary encoder. For full project info - diagrams, more explanations, schematics and full source, see http://www.pavius.net.

Category:

Science & Technology

Tags:

• rotary
• encoder
• tutorial
• waveform

[pavius1]

@dfgl1029 Thanks. Indeed a hardware filter can help, but this was an exercise in software handling for this mechanical rotary encoder. You're also right that a timer selector slider would be more intuitive, but again the point was trying to use only the rotary encoder as the interface.

[dfgl1029]

To debonce that spike, I guess you used a hardware low pass filter, or you lowered the sampling rate. Very nice UI, the only change I recommend is to use a slide switch for timer selection, pressing while turning is not common on control panels.

[pavius1]

@dargs001 It's a Tektronix TDS 220. I got it second hand in perfect condition on ebay for 550 USD.

[dargs001]

Nice explanation! Out of interest, which model of scope is that in the video? Looking at upgrading to one like yours. thanks