The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: Terry Pinnell
Subject: Re: Need help designing a circuit
Date: Sun, 03 Nov 2002 11:19:06 +0000
NNTP-Posting-Date: Sun, 3 Nov 2002 11:19:13 +0000 (UTC)
X-Newsreader: Forte Agent 1.92/32.572
>Ok...I'm not very bright...I haven't embraced microcontrollers, and like to
>do things with good old fashioned components and IC's. Keeping this in mind,
>I need a circuit that senses the position of an object, then turns on a
>motor to power a turntable to turn toward the object. I have several P.I.R
>detectors that will be placed in the center of the turntable. So I need a
>circuit that will sense which PIR has detected the object, and then switches
>off once the turntable is has turned towards the direction of the sensing
>PIR.. It doesn't need to have any sort of accuracy, as long as the turntable
>stops close to the subject(within about +/- 20 or 30 degrees). The
>switching can be either electro mechanical, or use LED Emitter/ Detectors.
>Thanks in advance.
Very vague spec!
1. 'senses the position of an object'. What sort of object? Size?
2. 'then turns on a motor to power a turntable'. Implies no motion
until object has been sensed? Yet later this is apparently
3. 'I have several P.I.R detectors'. How many?
4. 'will be placed in the center of the turntable'. Implies turntable
rotation will be restricted, to enable fixed connections to be made?
5. 'switches off once the turntable has turned towards the direction
of the sensing PIR'. But earlier you say PIRs are *on* the turntable,
at its centre?
6. 'accuracy...+/- 30 deg'. Implies anywhere within 60 deg arc OK; is
that correct? Could more than one object be within 60 deg?
Hobbyist, West Sussex, UK
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup