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49289

Re: Sonar Anomoly

Robert The chances of a sonar picking up an echo from a previous sonar is almost nil because they just are not powerful enough. Any detectable echoes have come
David Buckley
11:48 PM
#49289
 
49288

Re: Sonar Anomoly

Yes it should have been a nano second! ... From: 'Robert Dyer' robert@... [SeattleRobotics] To: SeattleRobotics@yahoogroups.com Sent: Tuesday, April
David Buckley
11:29 PM
#49288
 
49287

Re: Sonar Anomoly

And how long is a foot? And do you know who she was before you question what she had to say? ... From: twcarroll@... [SeattleRobotics] To:
David Buckley
11:27 PM
#49287
 
49286

Re: Sonar Anomoly

This is good stuff, David. Yeah, there are only a couple ultrasonic sensors I've seen that will actually let you measure the pulses from multiple echoes - I
Robert Dyer
7:37 PM
#49286
 
49285

Re: Sonar Anomoly

I love the video of Admiral Hopper, she is my idol. Earlier when I mentioned 33 microseconds of speed I was not talking about the sonars speed but the
carolhazlett
5:38 PM
#49285
 
49284

Re: Sonar Anomoly

Yeah Tom, I think it was actually a foot per nanosecond if memory serves.... Damn engineering units. I mix them on occasion as well. Here's a YouTube video of
Robert Dyer
5:12 PM
#49284
 
49283

Re: Sonar Anomoly

Here is my code. The funny looking serial stream is formatted so that Processing would pick it up and parse it correctly to each ellipse. Hopefully this
carolhazlett
4:10 PM
#49283
 
49282

Re: Sonar Anomoly

Grace Hopper must have had a 300 meter piece of string as light travels 300 million meters in a second. Tom C Remember Grace Murray Hopper's foot long piece of
twcarroll@...
3:38 PM
#49282
 
49281

Re: Sonar Anomoly

Hi Robert Remember Grace Murray Hopper's foot long piece of string which she used to illustrate how far light travelled in a microsecond well it works for how
David Buckley
3:31 PM
#49281
 
49280

Re: Sonar Anomoly

Hey David, Where did you post that info? Robert ... From: "David Buckley' david@... Sent: Monday, April 20, 2015 10:50 AM Did you read what I
Robert Dyer
2:01 PM
#49280
 
49279

Re: Sonar Anomoly

Did you read what I posted about the HC-SR04 about there being no timeout? From Forum posts this has been a major stumbling block for Arduinos and HC-SR04s.
David Buckley
10:49 AM
#49279
 
49278

Re: Sonar Anomoly

They are HC-SR04's with an Arduino Mega 2560. I am on my iPad right now, but when I get back to my computer this afternoon I will post my code so everybody
carolhazlett
10:35 AM
#49278
 
49277

Re: Sonar Anomoly

What is the model number of the sensors you are using? Obviously not Parallax Pings if they have four pins but what are they? What control computer ae you
David Buckley
5:07 AM
#49277
 
49276

Re: Sonar Anomaly

... Do you really mean 33uS? Presumably, you mean that a sensor doesn't fire until 33mS after the previous sensor receives its first echo. I'd have thought
Peter Balch
4:11 AM
#49276
 
49275

Re: Sonar Anomoly

The sensors only go off one at a time. They are four pin sonars wth a trigger and an echo pin and are timed so that the trigger of the next sensor does not
carolhazlett
4:06 AM
#49275
 
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