Re: TI-H: Scanning Sonar
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Re: TI-H: Scanning Sonar
I'm very interested in this. Perhaps this could somehow be intigrated with
the temp sensor to accurately figure speed of sound. It could also be
helpful for physics class : )
Corey
At 04:15 PM 11/24/97 PST, you wrote:
>>> 1. calibrate period (especially necessary with TI's) by putting an
>>> object in front of the sonar and allowing it to turn, detecting the
>>> object twice and timing that.
>>
>>Never thought about automated calabration before but it would be very
>easy
>>to add tothe software.
>>
>>> 2. calibrate speed of sound (changes w/temp)
>>>
>>
>>I probably wouldn't add this, I mean this sonar is just for fun right
>:)
>>
>>
>>>3. Now on the calcs' screen, there is a rotating arm. From step 1,
>its'
>>
>>> position is set to always match that of the sonar. The sonar normally
>>> will get no response until there is something in the way (and in
>range).
>>> It will send a signal to the calc whenever it sends a pulse,
>resetting
>>> the calcs' timer each time. If it receives an echo pulse it will send
>a
>>> different signal to the calc. The calc will, at the current location
>of
>>> the rotating arm on the screen, place a dot in correspondence with
>the
>>> time elapsed between sending the pulsse and receiving an echo.
>>>
>>
>>Since TI85s don't have built in timers, I'd suggest an external 555 IC
>but
>>you've gotthe basic idea. In the program I would most definantly
>include
>>more than on graphical interface. Probably 1) Old-style radar like the
>one
>>you described and 2) a Terrain Style
>>like the one I diagramed earlier.
>>
>>> Maybe something like a PIC will be needed to to the timings?
>>
>>I'm still realtivly new to electronics but seems like a pic might be
>>over-kill for a simplesend-time-stop-reset circut. If anybody could
>>hardwire one of these things I'd probably pay.
>>
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