I'm sure there exist some kind of digital spring scale that you can hook up the Overo
Where you could detect something suddenly weighing down the bird feeder, and then when it moves off.
I'd probably get one of ones off amazon that had the correct weight range for what I was trying to measure, and then break it open. I don't have any experience in using them.
From: Alex Gibson [mailto:alxx@...]
Sent: Tuesday, October 25, 2011 7:59 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Pressure Type Sensor To Connect To Overo
On 26/10/2011 1:36 PM, Bob Cochran wrote:
> On 10/25/11 6:37 PM, Alex Gibson wrote:
>> On 25/10/2011 12:52 PM, Bob Cochran wrote:
>>> On 10/24/11 6:06 PM, Alex Gibson wrote:
>>>> On 24/10/2011 2:26 PM, Bob Cochran wrote:
>>>>> I want to connect something to an Overo -- perhaps a pressure type
>>>>> sensor? -- that can signal when a bird has landed on my bird feeder, and
>>>>> when the bird has taken off. It would have to work for the entire
>>>>> physical perch. Birds must not be harmed or disturbed by the sensor or
>>>>> device. They should be able to stay on the perch for as long as they
>>>>> want in order to feed. The bird perch is circular in shape, going around
>>>>> the feeding area. What would that "something", sensor, or device be?
>>>>> Bob Cochran
>>>> maybe one of these force sensitive resistors ?
>>> Thanks, Alex! I guess Sparkfun is the place to go!
>> Maybe easier/more reliable to use a spring switch or switches
>> Mount the bird feeder via a hinge with a small spring and switch
>> (also make sure to fix it so a good wind can't open it the full way)
>> Wouldn't want to try something like this here as you'd get everything
>> from small finches and sparrows up to the galahs and cockatoos
>> weight range of around 20g to 1kg+
>> Problem feeding sulfur crested cockatoos is if you miss one day or they
>> decide they don't like the feed one day then they may just chew up the
>> or decide to chomp part of your house to sharpen their beaks.
> Hi Alex!
> Thank you for the suggestion, a spring and switch might work over here
> for what I want. You and Paul have now offered me 3 possible ways to
> sense a bird at a feeder.
Was just trying to think of the simpliest and easiest "sensor".
Only problem is the spring needs to be strong enough to resist any wind
but weak enough for small birds.
Could try a few different motion detectors/beams.
Maybe a shielded ir beam or laser(pointer) so the sun/reflections don't
Camera with motion detector is probably the most reliable way
but not the cheapest unless you do it all in software.
There is an open source video alarm software - detects motion in the
video then can trigger events etc.
Fun thing is setting it up so a moving branch etc doesn't trigger it.
The mobotix cameras can do a similiar thing internally in their software
just a matter of settings in their interface but probably a bit to pricey.
> My own personal problem is squirrels in the neighborhood. I hate them!
> They dig up my tree seedlings (after I leave for work.) They dig up my
> bonsai too.
squirrels are a lot more gracefull and quieter/less destructive than possums
"Possums had "terrible temper problems", he said. "They really hold a
grudge. Legally we can only move them 25 metres to 50 metres from where
we catch them, which means just moving them from your roof to your
backyard, and then fixing the roof so they can't get back in.
''Often possums I've removed from roofs have come back and pushed over
pot plants in the backyard and torn leaves off bushes,'' he said."
> We do have one local bird problem: vultures in the neighborhood. Yes, I
> live in a very urban, city environment and we have vultures. Very few
> compared to your cockatoo population. Apparently one of my neighbors (if
> someone a few blocks away is a neighbor?) was or is feeding vultures, so
> they hang around. I walked past one while on an exercise walk and we
> both startled each other.
> Thanks again to you for the great suggestions. I have been looking over
> the Sparkfun resistive force sensors and I'm wondering if a tiny finch
> is able to land with 100g (grams) of force.
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