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15842Re: [SeattleRobotics] SRF08 beam angle

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  • Paul R. Lundgren
    Dec 1, 2003
    • 0 Attachment
      In some cases the half beam angle is specified (makes the specs look better). Also the beam angle is usually specified at the -3 dB points.


      Hagar

      Alejandro Alonso Puig wrote:

      > Hi all,
      >
      > I've got a question. Does anyone of you know by experience what is the angle
      > of detection of the sonar ranger SRF08 from Devantech?.
      >
      > I have found some information on the Internet, but I don't believe what I'm
      > reading. I found that the angle detection is of about 40 degrees, but in my
      > tests I find it is about 100 degrees. SRF04 seems to really have 40 degrees
      > of beam angle, but not SRF08.
      >
      > The most interesting information I found about the beam pattern is the graph
      > taken from the manufacturer:
      > http://www.robot-electronics.co.uk/htm/sonar_faq.htm but Devantech really do
      > not give a clear figure for the beam width. I just see that depending on the
      > decibels the beam is wider on narrower. My though is that the transducer is
      > used at about -18dB and therefore the cone width is about 100 degrees.
      >
      > But I'm not sure I'm doing correctly or my unit is wrong in some way.
      >
      > Could someone please confirm from experience the beam width?
      >
      > Thanks a lot in advance
      >
      > Alejandro Alonso Puig
      > http://mundobot.com
      > alejandro.alonso@...
      >
      > -----Original Message-----
      > From: Doug Evans [mailto:DEvans@...]
      > Sent: sabado, 04 de octubre de 2003 0:55
      > To: Tom Capon; seattleRobotics@yahoogroups.com
      > Subject: RE: [SeattleRobotics] MPLAB error message
      >
      > you need a colon ':' character to define the label, if you are using MPASM.
      >
      > you should have
      >
      > KBD_1:
      >
      > not
      >
      > KBD_1
      >
      > -de
      >
      > -----Original Message-----
      > From: Tom Capon [mailto:robot@...]
      > Sent: Friday, October 03, 2003 4:32 PM
      > To: seattleRobotics@yahoogroups.com
      > Subject: Re: [SeattleRobotics] MPLAB error message
      >
      > Well, it gives errors from this code:
      >
      > goto KBD_1
      > bsf KBD,0x07
      > goto KBD_2
      > KBD_1 bcf KBD,0x07
      > KBD_2 decfsz ISRtmp1,W ; skip if ISRtmp1 == 1
      >
      > I think I will simply retype it or something and see what happends.
      >
      > At 08:22 AM 10/3/03 -0700, Jim McBride wrote:
      > >Make sure you don't have a case sensitive issue. In school I gave up and
      > >just coded everything in upper case to keep from getting bit.
      > >Have a look in your include file for your processor. You may find some
      > >answers there as well.
      > >Jim
      > >
      > >At 04:54 PM 10/2/2003 -0700, Scott Pierce wrote:
      > > >Then the GOTO statement probably points to a label which is not defined,
      > > >for example you could have a line that says: GOTO Delay; but Delay isn't
      > > >defined so the assembler doesn't know where you're trying to go to.
      > > >
      > > >Scott Pierce
      > > >
      > > >At 07:42 PM 10/2/2003 -0400, you wrote:
      > > > >Actually, it gives the "symbol not previously defined" error to GOTO
      > > > >statement line labels that are a few (or a lot) of lines down. I'll
      > > > >probably end up rewriting a bunch of it anyway, I'll come back if it
      > still
      > > > >doesn't work.
      > > >
      > > >
      > > >Visit the SRS Website at http://www.seattlerobotics.org
      > > >
      > > >To unsubscribe from this group, send an email to:
      > > >SeattleRobotics-unsubscribe@yahoogroups.com
      > > >
      > > >
      > > >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
      > >
      > >
      > >
      > >Visit the SRS Website at http://www.seattlerobotics.org
      > >
      > >To unsubscribe from this group, send an email to:
      > >SeattleRobotics-unsubscribe@yahoogroups.com
      > >
      > >
      > >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
      >
      > Visit the SRS Website at http://www.seattlerobotics.org
      >
      > To unsubscribe from this group, send an email to:
      > SeattleRobotics-unsubscribe@yahoogroups.com
      >
      > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
      >
      > Visit the SRS Website at http://www.seattlerobotics.org
      >
      > To unsubscribe from this group, send an email to:
      > SeattleRobotics-unsubscribe@yahoogroups.com
      >
      > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
      >
      > Visit the SRS Website at http://www.seattlerobotics.org
      >
      > To unsubscribe from this group, send an email to:
      > SeattleRobotics-unsubscribe@yahoogroups.com
      >
      >
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