Subject:
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Re: Ultrasonic Sensor Without Use Of A Microcontroller
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Mon, 29 Sep 2003 21:40:02 GMT
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Viewed:
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3040 times
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In lugnet.robotics.rcx.legos, Vikas Bhatti wrote:
> Hi,
>
> I found this website a while back,
>
> <link>http://www.btinternet.com/~leerwilson/design.html<link>
>
> and I decided to actually build the circuit he designed at the bottom of the
> page. I was wondering if anyone else has built it? I'm getting really jumpy
> readings from it, for example, at a fixed distance of say 60cm from the
> sensor,
> the values keep jumping around. Is there any way to combat this via
> programming?
>
> The sensor is operating at 40kHz. I tried emailing the guy who made the
> website
> but the email address doesn't exist as it's extension is @btinternet.com,
> which
> has now been changed.
>
> If anyone has any advice as to how this circuit could be optimised to work
> better, i'd really appreciate it. I only built this circuit because i don't
> have
> access to a PIC system and I can't really afford to spend £150 on a student
> kit....me being a university student now!! lol
>
> Cheers
>
> Vik
Hi Vik,
I saw that ckt Digram.
Try powering that ckt with battery. and use RCX to only read the reading. since
you may have spiks on your power line ( which will change your resonance
frequency of 555).
if that works use .1uF bypass cap as close as possiable to each of IC.
good luck.
Regards
Nitin
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