All things Ping . . .

CTB

Hey y'all a few PING related queries . .

Has anyone used multiple PINGS side by side without interference or jittery data?

How do you re-scale the PING to have a shorter range? (about 1m). Will I lose resolution doing this?

How big is the 'circle' on the wall if you beam it from its full range?

Has anyone used one with a teabox before?

http://shop.electrotap.com/products/teabox

cheers!

Mike Green

1) Several PINGs side by side have to be triggered at different times, otherwise the sound pulses will interfere with each other. You have to allow enough time for one pulse (and its major echos) to die down before initiating another.

2) The PING can handle distances down to 2cm although there would be problems with parallax from the separation between the two transducers. 1m minimum distance is quite reasonable. The resolution is determined by the resolution of the Stamp's PULSIN timer which is fixed for a given Stamp model. For the BS2, it's 2us. For the BS2p, it's 0.8us.

3) The PING documentation shows the effective beam width in degrees for different target shapes. It's not useful to describe the beam width without considering the target shape.

4) A Teabox wouldn't work. The PING requires a trigger pulse, then returns a variable width pulse dependent on the time to the first received echo. The Teabox is designed (as far as I can tell) for communicating voltage levels. That might work for other distance sensors like the IR ones from Sharp which output a voltage related to the distance to the sensed object.