[Lab] range finding

[Darcy Whyte]

That helped a bit thanks!





--
Darcy Whyte

Art+ inventorArtist.com <http://inventorartist.com/> | Aviation
rubber-power.com
Contact: darcy at inventorArtist.com | 613-563-3634 by appointment (no text)



On Wed, Feb 5, 2014 at 2:34 PM, j ross <waterfallclose at gmail.com> wrote:

> Some thoughts:
> 1) Increase timeout value
> The input loop runs at the rate of the DigitalRead() but the timeout is
> reached based on the number of iterations of the loop, not a fixed time.
>  Try increasing the SDM_IO_TIMEOUT to something bigger like 10000.
>
> 2) Increase pulse length
> The longer the pulse, the more energy you put into the air.  Ultrasonic
> frequencies get attenuated quickly in air so power is important to range.
> Try a pulse length of 50us instead of 10.
>
> Hope that helps!
> Jeff
>
>
> On Wed, Feb 5, 2014 at 2:02 PM, Darcy Whyte <darcy at inventorartist.com>wrote:
>
>> Hi, I have one of these (I think)
>> http://ramshackblog.blogspot.ca/2012/02/ultrasonic-range-finder-using-sdm-io.html
>>
>> It has four pins.
>>
>> I've got it working using the code at that page. It measures really well
>> up to about 30cm then after that it just prints out 999 cm?
>>
>> I noticed with a piece of paper I can get further (around 70cm).
>>
>> It's supposed to be good for 150cm.
>>
>> Any ideas what's going on here?
>>
>> I have two of them and I tried the other one (in case it was a bu
>> component). But same result...
>>
>>
>> --
>> Darcy Whyte
>>
>> Art+ inventorArtist.com <http://inventorartist.com/> | Aviation
>> rubber-power.com
>> Contact: darcy at inventorArtist.com | 613-563-3634 by appointment (no text)
>>
>>
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