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555 Timers
Forum Bounce Servo with 555 timer
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Related

Bounce Servo with 555 timer

Eric
Eric over 3 years ago

I want to toggle a servo with the push(and release) of a button.  I then want the servo to return to original position after x seconds.  I think I'm close by enlisting a 555 timer.  I have it successfully powering an LED for 1 second. (hold your applause)

Is this at least possible with this same circuit?  This is just a hobby project and I was trying to avoid grabbing an Arduino and coding something.

When I tried to connect my servo to pin 3, positive, and negative....it moved slightly once out of 10 attempts.  The LED is dimmer and shorter lived while the servo is attached.  

I should check back in here at least once a day until I get this working (and will report so) or smash the thing with a bat.

-EP

Some details...may be garbage.  THANKS IN ADVANCE!

Power = old 9v battery (8v)
Resistors = 10k
Cap = 100uf

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  • jc2048
    jc2048 over 3 years ago +4 verified
    Does this do what you wanted (sorry the video is a bit blurry)? community.element14.com/.../7411.MVI_5F00_3478.MOV Here's the circuit and the build on a breadboard the start position is controlled…
  • scottiebabe
    scottiebabe over 3 years ago in reply to jc2048 +3
    Neat little circuit. I wonder if I can upload .asc files on the new website. In the holiday spirit I put JC2048's deign into LTSpice for one to experiment with too. community.element14.com/.../1641.JC2048Servo…
  • dougw
    dougw over 3 years ago +2
    As @ scottiebabe points out it is a bit tricky but possible to do with 555 timers. You could make the middle waveform with a 556 (dual 555) - one 555 would generate a continuous square wave with 20 ms…
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  • scottiebabe
    0 scottiebabe over 3 years ago

    Is it possible? Yes. Would I recommend a 555 for this application, no.

    Consider that you will need to generate a PWM waveform sweeping from a 5% dutycycle to 10% dutycyle depending on the servo.

    image

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  • Eric
    0 Eric over 3 years ago in reply to scottiebabe

    Is there a more elegant solution to this?  I have only touched the surface of small electronics and may have got hung up on the name 'timer' thinking that was the best solution.  I also saw something of interest where the servo was physically modified and performed without pwm.

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  • scottiebabe
    0 scottiebabe over 3 years ago in reply to Eric

    Beauty is in the eye of the beholder. If you decide to use 555 timers you could submit your design to the 555 timer contest on hackaday.

    I recently used a RPI Pico to enable a PWM output after a button press it was too easy. Just a few lines a code and done.

    image

    A little microcontroller is a reasonable solution. The only challenge with the 555 or discrete logic in general is it isn't a cookbook application and may be a bit daunting depending on your experience.

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  • scottiebabe
    0 scottiebabe over 3 years ago in reply to Eric

    Beauty is in the eye of the beholder. If you decide to use 555 timers you could submit your design to the 555 timer contest on hackaday.

    I recently used a RPI Pico to enable a PWM output after a button press it was too easy. Just a few lines a code and done.

    image

    A little microcontroller is a reasonable solution. The only challenge with the 555 or discrete logic in general is it isn't a cookbook application and may be a bit daunting depending on your experience.

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  • Eric
    0 Eric over 3 years ago in reply to scottiebabe

    Thanks for the feedback.  I am pursuing it with an Arduino now.  I can picture the final project having user input of pushing the button more than once to adjust the delay.  I did learn a touch along the way though.  Hoping to post in here with a completed project before 2022. 

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  • scottiebabe
    0 scottiebabe over 3 years ago in reply to Eric

    Sounds like a fun project. If you hit any snags, there are lots of members happy to help. Happy making!

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