I just stumbled across this while randomly looking at Arduino projects for ideas.
Is there any reason why people aren't using these for backup sensors instead of the Automotive-specific ones? They look to be a lot cheaper, then you can interface them any way you want.
I suppose the only possibly issue is weatherproofing. I don't think the Ping has any sort of weatherproofing, and I'm not sure if you can cover up the sensor without messing with the reading.
Anyway, just thought I'd share with everyone. The link I found, the guy had installed one in his garage, so his wife could park without dropping the garage door on the car. Cooler than the old tennis ball on a string trick.
How Much Horsepower Can I have And Still Go To Heaven?
I had some experience with the ping sensors for a school project on making a remote control car autonomous. besides the whole weatherproofing issue, the Ping sensors worked quite well.