Author Topic: Sensors and Snow  (Read 6417 times)

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Offline Admin

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Re: Sensors and Snow
« Reply #30 on: May 29, 2009, 03:46:17 PM »
whats up with the picture?
all i got from it was a bunch of the navy standing on a ship ;D
The forum auto-shrink image feature broke during the last software upgrade . . . you'll have to use the scroll bar to see the rest of the image for now ;D

Offline Soeren

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Re: Sensors and Snow
« Reply #31 on: May 30, 2009, 06:45:50 AM »
It's only part of the picture - Follow the link, it shows the picture in whole.
Regards,
Søren

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Offline SmAsH

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Re: Sensors and Snow
« Reply #32 on: May 30, 2009, 06:56:15 AM »
It's only part of the picture - Follow the link, it shows the picture in whole.
what? what link?
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Re: Sensors and Snow
« Reply #33 on: May 30, 2009, 07:08:25 AM »
It's only part of the picture - Follow the link, it shows the picture in whole.
what? what link?


Otherwise I like Soerens idea. The Navy does that, covering up radar dishes with bowls. For example, those ball thingies on this ship are covered up dishes:

http://aycu20.webshots.com/image/47099/2003529587801442487_rs.jpg

Offline kpmcgurk

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Re: Sensors and Snow
« Reply #34 on: May 30, 2009, 07:17:46 AM »
Hmmm, Im confused with the picture?
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Offline SmAsH

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Re: Sensors and Snow
« Reply #35 on: May 30, 2009, 03:54:01 PM »
admin was showing that the navy cover they're dishes with bowls do
prevent... damage?
i think i get it now, thanks guys.
Howdy

Offline kpmcgurk

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Re: Sensors and Snow
« Reply #36 on: May 30, 2009, 04:08:20 PM »
I see :) that actually would be a great way to do it, this would keep the snow off of them in general!!
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Offline SmAsH

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Re: Sensors and Snow
« Reply #37 on: May 30, 2009, 04:51:22 PM »
does anyone know if it being closed interferes with the signal quality?
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Offline Soeren

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Re: Sensors and Snow
« Reply #38 on: May 31, 2009, 03:36:59 AM »
Hi,

It won't interfere if the material is carefully selected - a metal dome would be a big no-no of course :)
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline HDL_CinC_Dragon

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Re: Sensors and Snow
« Reply #39 on: May 31, 2009, 03:05:36 PM »
If it interfered with the signal strength im pretty sure the Navy wouldnt use it :P Heck im sure if you just Saran wrapped the thing youd be good to go lol
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Offline GearMotion

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Re: Sensors and Snow
« Reply #40 on: May 31, 2009, 04:19:56 PM »
If it interfered with the signal strength im pretty sure the Navy wouldnt use it :P Heck im sure if you just Saran wrapped the thing youd be good to go lol

Or like I suggested on the first page - tarp. I've seen many dishes covered in tarp like a drum skin stretched on a frame. Again - A physical solution to prevent snow accumulation might just be the easiest.

Offline paulstreats

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Re: Sensors and Snow
« Reply #41 on: May 31, 2009, 04:30:53 PM »
back to the original problem.

Roombas have a sensor that detects heavy particulates. meaning that if a lot of crumbs hits a sensor then it concentrates on cleaning that area more.

A similar sensor could detect rain and possibly snow drops hitting it. I would imigine its just a simple piezo type sensor with a program that detects high/fast rise peaks...

Offline kpmcgurk

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Re: Sensors and Snow
« Reply #42 on: May 31, 2009, 05:25:13 PM »
I would see what I could do as far as making something, and then testing it, but unfortunately it is the summer(springish), and there is no snow so I cant :(
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Offline AsellithTopic starter

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Re: Sensors and Snow
« Reply #43 on: June 01, 2009, 06:53:50 AM »
They make dome tarps designed to do this but they cost around $500 to buy per site. Thats is way out of the budget. The budget for this project is like under $30 because it will cost me about $200 to have the tech install it and ship it. Let alone my time building the device. We just can't justify spending to much money on these sites as some bring in like $1500 a year in contributions and thats barely enough to cover the rent at the site.
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Offline paulstreats

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Re: Sensors and Snow
« Reply #44 on: June 01, 2009, 07:14:13 PM »
piezo discs can cost like $1 each...

Offline HDL_CinC_Dragon

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Re: Sensors and Snow
« Reply #45 on: June 01, 2009, 10:20:39 PM »
1) Would the current generated by a piezo being struck by a rain drop be enough to read by a cheaply available MCU?
2) I thought piezos only reacted to the intial change in pressure on their surface so like if you pressed down on one with 5 newtons of force and held it w/ 5N of force for like 10 seconds, wouldnt their only be a current from the time it takes the ~0 newton forces on it to reach 5 newtons(such as a fraction of a second if you were pressing on it with your finger)?

If my second question is indeed correct then that method would be entirely ineffective because you wouldnt be able to tell if there was anything currently on the piezo, you would only be able to tell if something was enacting a force on the piezo at that point in time... and even if you had some sort of memmory for it so that when you woke up in the morning to look at the display it said "something hit the piezo" or w/e think of how annoying that would be every time a large gust of wind came by and pushed on the piezo. If its sensitive enough to detect the force of a rain drop, a moderate gust of wind would surely be able to set the thing off.
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Offline Soeren

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Re: Sensors and Snow
« Reply #46 on: June 02, 2009, 08:27:32 AM »
Hi,

As you assume, a piezo only gives a signal when hit (actually, when flexing). The signal looks like a dampened sine, since a hit will vibrate it like that.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

 


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