This thread:
http://forums.reprap.org/read.php?178,462309

over at the reprap forums discusses an infra red proximity detector design =
for Z probing the build plate on a 3d printer... a very similar problem :)

Kind Regards,

Robin Bussell,

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of=
 Bob Blick
Sent: 01 September 2015 05:45
To: Microcontroller discussion list - Public.
Subject: Re: [EE] Very-small distance sensor?

Here's a distance sensor intended for cell phone face proximity. Uses time-=
of-flight of a laser:

http://www.st.com/web/catalog/mmc/FM132/CL2136/SC1934/PF260441

In the past I might have recommended one of the Sharp rangefinding modules,=
 but the ST thing makes them seen crude:

http://www.digikey.com/product-search/en?v=3D425&v=3D1149&FV=3Dfff4001e%2Cf=
ff803b2&k=3Ddistance&mnonly=3D0&newproducts=3D0&ColumnSort=3D0&page=3D1&qua=
ntity=3D0&ptm=3D0&fid=3D0&pageSize=3D25

Bob

On Mon, Aug 31, 2015, at 08:39 PM, Neil wrote:
> Anyone know of a non-contact distance sensor that can measure up to=20
> say
> 1 inch?  I built a machine for maker faire (in less than 2 weeks) that=20
> lets people draw on a touch screen an that will get printed with=20
> frosting on a cookie.  But if the cookie is not flat (rarely are they=20
> really flat), there are issue with the frosting not sticking properly=20
> in some corners or sharp curves.  I'm thinking if I can map the=20
> surface of the cookie quickly before printing each one, I can have the=20
> Z-axis track the cookie's "terrain".  This is a fun project so low-cost i=
s important.
>=20
> Cheers,
> -Neil.
>

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