In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

Matthias09,

How are you using the 2 PING sensors?  you can only use one at a time or else they will produce false signals or noise.

Also, looking at the documentation for the PING, I wonder what the reflective acoustic properties of the ball are, and how big the ball is....

[green]
The PING))) sensor cannot accurately measure the distance to an object that: a) is more than 3 meters
away, b) that has its reflective surface at a shallow angle so that sound will not be reflected back towards
the sensor, or c) is too small to reflect enough sound back to the sensor. In addition, if your PING)))
sensor is mounted low on your device, you may detect sound reflecting off of the floor.
[/green]


...So in an earlier post you said that your getting a value of 300 from PULSIN ... if I did that correct, that's about 8.14 inches... does that correspond with your setup? ... and do your numbers report valid values if you manually move the ball? .. or do the numbers jump around?

My experience with the PING is that it's very stable,  It seems as if your getting a huge amount of variation, then your PING might be seeing sonic reflections.  Can you post any pictures of your setup and maybe describe how you are using two PING sensors?

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