Motion Controlled Squirt Gun

Discussion in 'The Projects Forum' started by Kucster, Apr 4, 2014.

  1. Kucster

    Thread Starter New Member

    Apr 4, 2014
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    0
    Hi all and thank you in advance for your help.
    I have a problem with my GF cats scratching at the door before we get up in the morning so I had the idea of making a motion controlled squirt gun that would squirt them when they come near the door, a bonus would be using it to keep them off the counters as well.
    I was hoping to use a motion controlled light I already had and I purchased a squirt gun with a motorized trigger. (Light http://www.amazon.com/gp/product/B00GWLVREE/ref=oh_details_o05_s00_i01?ie=UTF8&psc=1 Squirt Gun http://www.amazon.com/gp/product/B00416QW88/ref=oh_details_o05_s00_i00?ie=UTF8&psc=1). I was able to isolate the output of the PIR sensor in the light but unfortunately it does not have enough to drive the motor so I tried a relay and this worked good. But the light is set to be active for 1 Min which is way to long, I would need it to be 1 -2 sec. I was thinking about using a 555 circuit to drive the relay but I was hoping to get your advise as I have a sneaking suspicion there might be an easier way.
    Thank you very much!
    Sean
     
  2. GRNDPNDR

    Member

    Mar 1, 2012
    435
    7
    There might be an adjustment for how long the light stays on, so I'd check for one of those first, but if it doesn't have one then I think it probably would come down to using a monostable 555.

    using a 47K Resistor and a 10uF cap you would get a 0.5sec pulse.

    I just roughed that up with an app I have on my phone.
     
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  3. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    Have you considered a new girlfriend?
     
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  4. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
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    Last edited: Apr 4, 2014
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  5. wayneh

    Expert

    Sep 9, 2010
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  6. burger2227

    Member

    Feb 3, 2014
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    There is most likely a chip in the PIR sensor that controls the output. Get the chip number and maybe the output time can be controlled. Can you get a closeup of the PC board?
     
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  7. Kucster

    Thread Starter New Member

    Apr 4, 2014
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    Thank you everyone for your response's and what an awesome video!

    @burger2227 I do not have it with me but I can find out later and let you know. I did some research on changing the timing of the circuit and most people said to change one of the R or C's. The problem I see if that they are surface mount and I'm not sure if I would be able to get them off the board and if I could I do not have any other surface mount components.

    @GRNDPNDR Thank you for your help, I will use this as a start if I choose to go that direction
     
  8. elec_mech

    Senior Member

    Nov 12, 2008
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    Personally, I like this device. It does what you are describing but with compressed air, thus no worries about water damage. And I can say it works well (at least while it lasted).

    However, water is very effective too. A monostable 555 would do, just be sure to add an edge-trigger, otherwise the 555 will keep your water gun on as long as the PIR is outputting a signal. Take a look here. You can also find a schematic for making the monostable.
     
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  9. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    Hilarious. I still think changing the girlfriend is easier...
     
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  10. Kucster

    Thread Starter New Member

    Apr 4, 2014
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    Thank you very much everyone for your help. I was able to go back an analyze the circuit closer and find the R and C combo that was setting up the timing. I replaced the R with a POT and now the timing is adjustable.

    Thanks again
     
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