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Re: External PIR
- To: ukha_d@xxxxxxx
- Subject: Re: External PIR
- From: "David Buckley" <db@xxxxxxx>
- Date: Wed, 30 Apr 2003 21:55:21 -0000
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
--- In ukha_d@xxxxxxx, "Steve Morgan" <steve@s...> wrote:
> You can get a seperate PIR for outdoor lighting. I used to have an
MK
> one. Since external PIRs are mostly mains switching, I added a mains
> operated relay and used the NO contacts between the RTS and CTS
pins on
> the PC's serial port. Then, whenever the PIR triggers, you get a CTS
> state change on the serial port. Most PIRs only operate at night,
so if
> you want 24 hour signalling, put some heatshrink or tape over the
LDR.
There are specific outdoor PIRs; most of them are 12V operated, and
have a simple open collector output which allows several PIRs to be
paralled, an all it needs is a pull-up resistor and an input bit.
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