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Feb 18, 2009, 01:34 PM
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The truth about sonar

So after 7 days, the unidirectional sonar test kit finally made it out of the wasteland. Put a simple 1000:1 high pass amplifier on it. Sadly, it's very directional. The more you amplify it in hardware, the more directional it is. In software, you can do all kinds of things to it, but we don't have the luxury of a 40Mhz sound card.

Running it on 5V definitely improves the range. Unfortunately you're stuck with a very small cone of visibility in front & above the transducer. The range is stuck under 5ft. You'd have to use takeoff tricks again, just like with GPS. Running it over 5V would require a matched impedance power amplifier. You can't just plug it into a BJT.

With the constant rain & all you job seekers pouring in from the wasteland, we're spending hours & hours on the freeway. Only got a couple tests in with the Maxbotix's.

Future options:

Build the reference design.

Grind up the Maxbotix's to try to make them more omnidirectional & forget about using bounce mode for altitude.

You can keep spending money on this until you're up to this $1300 positioning system. The web pages have no information & he's got no advertising, but it's machine vision.
Last edited by Jack Crossfire; Feb 18, 2009 at 02:14 PM.
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