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PICList Thread
'Sonar Ranging'
1995\10\26@142901 by Ben L Wirz

Hi Richard,

       I just got a data book from TI that has three IC that they
produce specifically for sonar ranging control.  As this is also one my
interest (great for robots), I am going to look into to using them and I
let you know.

Device #'s


       They were in the Linear Circuits Data Book, Vol #3, available
from your friendly TI Rep 214-644-5580.


1995\10\27@143925 by John Loch

>        I just got a data book from TI that has three IC that they
>produce specifically for sonar ranging control.  As this is also one my
>interest (great for robots), I am going to look into to using them and I
>let you know.

I found an even simpler way of getting sonar range data.  Go to Radio Shack
and buy their electronic tape measure for $24.95.  I haven't had a chance
to open it up yet, but I'm sure you can access the range data either in
analog form or the signals sent to the LCD.

- John Loch
The Source for Renewable Energy -

- John Loch
The Source for Renewable Energy -

'Sonar Ranging'
1995\11\03@081250 by John Bean
I just talked to the TI Rep and they say that the TL853 has been
discontinued and that the TL851 and TL852 are not recommended for new

{Quote hidden}

John Bean

Advanced Telemetry Systems

'Sonar Ranging'
1998\09\06@101327 by THEODORE MYLENBUSCH
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<DIV><FONT color=#000000 size=2>I've completed a pic programmer from plans in
the last months Electronics Now.&nbsp; This device programs c84 and f84
devices.&nbsp; I am using the software available from the EN site called
nopp.&nbsp; It works great.&nbsp; But the power must be on to the programmer and
the pic inserted when I start the noppp.exe software.&nbsp; This is contrary to
the text of the article.</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>My intent was to use the &quot;sonar
rangefinding&quot; application from page 123 of the Parallax &quot;Basic Stamp
Programming Manual, Version 1.7&quot; and, instead of using a Basic Stamp I, use
a p16f84 to send the 40kHz burst and measure the time to detection (rising edge)
from the LM567 output.&nbsp; I have completed the assembly of the rangefinder
and have struggled with the timing measurement.&nbsp; The sensors are 1 inch
apart (center to center) and the initial pulse of the transmitter is suppose to
reach the receiver approximately 74us after the pulse begins.&nbsp; I have tuned
the 555 transmitter and 567 tone decoder frequencies using a pulse
counter.&nbsp; I do not have a digital sampling capability on my oscilloscope
but using a trigger from the reset pin of the 555 I have been able to see both
pulses.&nbsp; Finally, my questions:</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>1)&nbsp; I am uncertain as to the best way to
time both the 40kHz burst and the interval to the rising edge.&nbsp; Should I
use the timer available on the pic, or implement a software timer?&nbsp; What
about the 8 bit limit?&nbsp; Should it be tmr0 interrupt driven?&nbsp; Should I
poll the port or have it interrupt also?&nbsp; </FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>2)&nbsp; Ringing doesn't appear to be a problem
as I have wrapper the transmitter and receiver is foam tape.&nbsp; However, I
get multiple input spikes after the initial outgoing pulse reception.&nbsp; Is
there a trick in determining which rise is the true obstacle reflection?&nbsp;
Perhaps some theory insight would help here.</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>3)&nbsp; I plan to mount the transmitter/sensor
pair on an RC airplane servo and serially transmit both the current angle of the
servo and time to bounce to an HC11 to do the actual mathmatics.&nbsp; The
eventual intent is to create a map in memory as the robot moves along.&nbsp; (RC
servos also drive the wheels).</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Any help ranging from &quot;this is the
completely wrong approach and why&quot; to &quot;yes this may work if you
consider these items&quot; would be greatly appreciated.</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Taking this chance I want to say thanks to all
for these insight discussions.</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Ted Mylenbusch</FONT></DIV>
<DIV><FONT color=#000000 size=2><A
href=""></A></FONT></DIV>> <DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV></BODY></HTML>


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