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Member #95049

Member Since: December 7, 2009

Country: United States

  • I've tried this build, something I've observed through experiment is that the tapped servo potentiometer feedback is highly inaccurate when stalled: it gives inaccurate readings of (ADC converted) +/- 45 handlePosition steps, whereas when not stalled it's very accurate (+/- 1 step). This made it hard to determine with confidence whether or not the handle actually arrived at the fully opened position. I wonder why it fluctuates when stalled like that. Did you guys notice that at all during your testing?

    In any case, it does suggest that using a button to sense "openness" is a more reliable design.

  • Makes sense now, thanks!

  • Hi Nate, great writeup! Thank you.

    I had trouble figuring out one thing though: It looks like the tryHandle() function has been updated to no longer do an analogRead on the output from the servo to determine when it's fully pulled down, but rather uses a digitalRead on servoPositionButton. What is this servoPositionButton? I don't figure out what it's connected to, given the hardware and safe presented in the article.

No public wish lists :(