AVR-Chat

Rajesh,

Check out the IS471F:
http://www.junun.org/MarkIII/datasheets/IS471F.pdf

It is an optical solution, but it is not that sensitive to ambient light 
because the light send is modulated and the light received is filtered by 
the IS471F.

The circuit is very simple: you only need to add an IR-LED, see datasheet.

A lot of links (circuits) can be found for this component.

I shrunk a piece of heat shrink tube around the LED to prohibit light 
leaking from the LED directly to the IS741F.

Regards,
Robert


>   -----Original Message-----
>   From: rajesh parwani [mailto:rajesh_almighty@yahoo.co.in]
>   Sent: Wednesday, December 22, 2004 4:58 AM
>   To: AVR-Chat@yahoogroups.com
>   Subject: [AVR-Chat] sensors...
>
>
>   hi friends,
>                  im searching for the sensors which can detect barrier at 
>a
>distance of   upto  3  cm  and not more . well my working condition  have
>lot of ambient light . i would prefer to fix the setting once for any
>lighting so that need not change it from place to place. please suggest me
>some way . should i go for ultrasonic sensor or the normal opto. if 
>possible
>send me some circuit
>
>   regards,
>   rajesh

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