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Topic: Two Ping sensors on one Arduino (Read 2 times) previous topic - next topic

elbiondo

There isn't a url of the datasheet, but under downloads and resources on this link, the datasheet is listed as a .pdf under Ping documentation v1.6:

http://www.parallax.com/tabid/768/ProductID/92/Default.aspx

Again, I incredibly appreciate you help!!!!

robtillaart

So the URL of the datasheet is :   http://www.parallax.com/Portals/0/Downloads/docs/prod/acc/28015-PING-v1.6.pdf
just hoovering over the link => right button => copy link location (firefox)

If time permits I will have a look at it, but very busy with my own stuff this week.

Could you tell more about the application, what you are trying getting done? What kind of objects do you want to detect? people, walls, rabbits, doors, ? ...
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

jraskell

The range of a sonar based sensor is highly dependent on the nature of the target itself.  Not only the shape and size of the target, but the composition of that target, since sound reflects differently off different materials.  You're only going to see that advertised maximum range against an ideal target, and a soft, sound absorbing, human body (assuming with cloths on, which are even more sound absorbing), is nowhere near an ideal target. (an ideal target being a flat, hard surface that offers maximum sound reflection)

The datasheet itself shows the characteristics of two different targets, a cylinder and a 12x12 piece of cardboard, and neither one reaches the advertised 3m maximum range.

raron

Quote
My reasoning for using two Ping sensors is that I would like to increase the pulse distance of the Ping sensor.

In that case take a look at AlphaZeta's really nice DIY range finder (Now that took some googling to find, just saying :P) He got it to more than 20 feet range!

elbiondo

@robtillaart: I'm detecting people. I'm an artist, and my work is about viewer accessibility. As the viewer walks up to the artwork, an LED at the center of the work corresponds in brightness to the distance that person is from the work--the closer the person walks, the brighter the light. The farther away, the dimmer the light gets. Ultimately, the closer the person gets and the more they try to view the artwork, the more impossible that task becomes. I need the sensor to function as far as possible to affect the greatest amount of viewers.

Attached is a crude mockup of the situation.

@jraskell: thank you! that seems very logical. i checked my serial monitor instead of relying on my other output (an LED), and the distance was 370 cm at the most, but mostly 250 cm. It's a bit farther than I thought, so that's useful in some sense!

@raron: WOW! What a great find! Now if only I can build such a magical device...

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