Author Topic: PING))) Ultrasonic Sensor  (Read 4905 times)

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Offline epicjr77Topic starter

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PING))) Ultrasonic Sensor
« on: April 16, 2008, 09:40:52 PM »
Has any one used this out doors?  I am looking to put one on a 130lb bot and wondering how it would do. 

Offline frank26080115

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Re: PING))) Ultrasonic Sensor
« Reply #1 on: April 16, 2008, 10:00:47 PM »
as long as there's no bats flying around, it should perform as specified.

Offline brickbob

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Re: PING))) Ultrasonic Sensor
« Reply #2 on: April 17, 2008, 03:20:38 AM »
You should give it a try. You wouldn't be disappointed.

Offline airman00

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Re: PING))) Ultrasonic Sensor
« Reply #3 on: April 17, 2008, 07:09:56 AM »
yea the PING sensor will work outdoors
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Offline BANE

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Re: PING))) Ultrasonic Sensor
« Reply #4 on: April 20, 2008, 06:04:31 AM »
Yea defiantly use the PING))).  I went to a college last week and they had been working on a robot car.  Low and hold when i got a closer look they had PING))) sensors on the side of it!

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Offline Steve Joblin

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Re: PING))) Ultrasonic Sensor
« Reply #5 on: April 20, 2008, 08:11:28 AM »
The PING))) can be used outdoors noting the following:

it is not a water-proof device... do not expose to water.

Sound travels faster in warmer air than in cooler air, so depending on the outside temperature, you accuracy may be off a bit.

Offline BANE

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Re: PING))) Ultrasonic Sensor
« Reply #6 on: April 20, 2008, 03:06:57 PM »
Quote from: Steve Joblin link=topic=3910.msg30608#msg30608
Sound travels faster in warmer air than in cooler air
[/quote

I learn in physics that sound travels faster when cold because the molecules are closer together, i think.  Just wonding

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Offline Steve Joblin

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Re: PING))) Ultrasonic Sensor
« Reply #7 on: April 20, 2008, 03:13:51 PM »
Physics Lesson: Temperature and the Speed of Sound

Temperature is also a condition that affects the speed of sound. Heat, like sound, is a form of kinetic energy. Molecules at higher temperatures have more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel more quickly. The speed of sound in room temperature air is 346 meters per second. This is faster than 331 meters per second, which is the speed of sound in air at freezing temperatures.

The formula to find the speed of sound in air is as follows:

v = 331m/s + 0.6m/s/C * T

v is the speed of sound and T is the temperature of the air. One thing to keep in mind is that this formula finds the average speed of sound for any given temperature. The speed of sound is also affected by other factors such as humidity and air pressure.

Offline Conscripted

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Re: PING))) Ultrasonic Sensor
« Reply #8 on: April 21, 2008, 04:25:10 PM »
The speed of sound is also affected by other factors such as humidity and air pressure.


So can I read that to say altitude?

Offline Steve Joblin

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Re: PING))) Ultrasonic Sensor
« Reply #9 on: April 21, 2008, 05:48:32 PM »
I would think "yes" as altitude can result in a double whammy... less pressure and colder temperatures!

Offline airman00

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Re: PING))) Ultrasonic Sensor
« Reply #10 on: April 21, 2008, 07:59:33 PM »

it is not a water-proof device... do not expose to water.
lol

a bit obvious

also, I heard you can waterproof it using plastic spray (forgot what its called, something urethane)
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Offline JAy1st

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Re: PING))) Ultrasonic Sensor
« Reply #11 on: April 24, 2008, 07:57:06 AM »
There is a guy in France who made a "Nautile" 1/8 scale driven by a picbasic2000.

He made a water proof sonar using MA40E7R as Rx and MA40E7S as Tx, from MURATA.
The circuit can be found here: http://arn.gui.free.fr/sonar.htm
The trials were done in a swimming pool .


If in need of some translation I can help

Offline Admin

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Re: PING))) Ultrasonic Sensor
« Reply #12 on: April 26, 2008, 06:58:02 PM »
So the sensor will work . . .

but suppose your robot drives up to a hill - your bot can simply drive up it, but it will appear as an obstacle in the way instead. Same for going down-hill, a change in slope could appear as an object in the way.

Offline JAy1st

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Re: PING))) Ultrasonic Sensor
« Reply #13 on: April 27, 2008, 01:27:46 AM »
Will need some kind of 3D radar, and a good interpretation of the "picture" to figure out if it's an obstacle or a slope ?

Offline frodo

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Re: PING))) Ultrasonic Sensor
« Reply #14 on: February 10, 2009, 12:33:59 PM »

it is not a water-proof device... do not expose to water.
lol

a bit obvious

also, I heard you can waterproof it using plastic spray (forgot what its called, something urethane)
poly-urethane? amyway, in science, we learnt that submarines use PING sonar and they go underwater so why not water-proof?
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Offline Trumpkin

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Re: PING))) Ultrasonic Sensor
« Reply #15 on: February 10, 2009, 12:48:37 PM »
Quote
amyway, in science, we learnt that submarines use PING sonar and they go underwater so why not water-proof?

Electronics and water don't mix. PING))) is the name of an ultrasonic sensor http://www.parallax.com/Store/Sensors/ObjectDetection/tabid/176/ProductID/92/List/1/Default.aspx?SortField=ProductName,ProductName
« Last Edit: February 10, 2009, 12:50:57 PM by Trumpkin »
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Offline frodo

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Re: PING))) Ultrasonic Sensor
« Reply #16 on: February 10, 2009, 12:59:37 PM »
i know that but ping is also the term for the frequency "ping" that ultrasonic devices send out and receive back. submarines have the emitters on the inside of the submarine so how does the sound get into the ocean without hitting the sides of the submarine and bouncing straight back?
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Offline 4by4

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Re: PING))) Ultrasonic Sensor
« Reply #17 on: February 13, 2009, 08:05:41 AM »
My guess would be that the sonar transducer is mechanically impedance-matched to the hull, so little reflection occurs. The hull wouldn't have to be pressure resistant where the sonar transducer is located. The transducer could be at ocean pressure. So you could have an impedance match between transducer, hull and water.

Offline Keppnertj

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Re: PING))) Ultrasonic Sensor
« Reply #18 on: February 16, 2009, 09:42:06 PM »

it is not a water-proof device... do not expose to water.
lol

a bit obvious

also, I heard you can waterproof it using plastic spray (forgot what its called, something urethane)

it Tis a form of poly urethane, carfull to follow all saftey precations when using, very hasardouse to lungs if atomized or burnt but should work for this aplication. dont know for sure but it has no adverse affects with rf sigs (no i can not spell)

 


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