What happens when PING))) doesn't receive echo?

GTKNarwhal

I am getting ready to add a timeout feature to my PING))) driver and need to know what happens if the PING))) doesn't receive its echo? Does it produce an 18.5 mS pulse indicating a maximum reading? Or does it produce a somewhat longer pulse to indicate it never received an echo?

Thanks!

Gamu The Killer Narwhal

Phil Pilgrim (PhiPi)

It simply times out after waiting 18.5 ms for an echo that never returns, so that's the longest pulse you will see.

-Phil

Mike Green

The maximum pulse width of the PING's echo detection pulse is 18.5ms. That's where the microcontroller on the PING times out. There's no distinction between the width of a pulse caused by a time out vs. a received echo at precisely 18.5ms.

GTKNarwhal

Thanks for the replies!