Activate PIR xmtr

changing thermal infrared small 100 ohm resistor fed by 1Hz 5V square wave

Active Passive? PIRs don't transmit.

When looking for the LED, what description do I look for ? I have never seen anything called a thermal LED. DigiKey have them. Their on-line catalog is impossible to find anything especially LEDs. Any part number for me ?

I am trying to build a garage door monitor. My new garage door opener does not have a lock function like my previous so I need a way to monitor the door state in my house,

The driveway monitor is almost all I need and if I had a schematic I could modify it internally. Looking at the circuit board does not give enough info.

Jasen Betts wrote: > On 2018-09-23, OGER wrote: >> Suggestions please. >> >> Taking a driveway PIR xmtr to modify for other purposes with no actual >> internal mods. > > >> What is needed to activate the PIR. LED color or type ? > > changing thermal infrared > small 100 ohm resistor fed by 1Hz 5V square wave >

Jasen Betts wrote:

You could pick off a signal from the down limit switch to drive a transmitter or direct wire to a led inside the home or whatever.

you need a heat emitter, not a light emitter, use a small heat source, like a small lamp or a resistor

an LM555 powered by 5V blinking a 0.3W 6V lamp would probably do the trick

digikey part number CM756-ND is a 14V lamp but using lower voltage will make it last longer and produce more infrared than a 5V lamp

Wire the 555 discharge and output pins in parallel, this lamp is borderline max load for a 555 so combining the two outputs will help..

----+-----------------+-- +5V 1Meg | | +-[R1]--------|--------+--(@)---+ | | | | +--------+ | lamp | | | | | | . . . .|. . . . | | | . VCC(8) . | | | . . | | +--RES(4) OUT(3)--+ | . LM555 . | +-------TH(6) DIS(7)--+ | . . +-------TR(2) CV(5)-----+ 1uF | . . | ===== . GND(1) . | | . . . .|. . . . ===== 100nf | | | +-------------+ | | | +-----------+ | ---+-- 0V

run frequency is about 1.4Hz

I must be missing something. Why do you need the PIR to achieve that objective?

In my burglar alarm wiring loop I included an improvised microswitch toggled by the state of the garage door.

Terry, East Grinstead, UK

I got a garage door monitor from Sears. It has a device (powered by a CR20

I think it cost me about US$40, but a quick Google search shows them from C hamberlain and LiftMaster for under $100. Since Sears and OSH are both goi ng out of business, you might be able to find one at a clearance price.

Of course, this approach deprives you of the joy of building one for yourse lf.

Because it is there ! The least mod to the driveway monitor is desired. That way if in the future the PIR xmtr fails I can simply replace it or the receiver if it fails.

So making the PIR detect something and activating the transmitter so the receiver will flash as it normally would.

Terry P>

That receiver has a tiny LED, I need more brightness to illuminate the far side of the room. The driveway monitor has three leds and is bright.

snipped-for-privacy@my-deja.com wrote:

us

CR2032 battery) that attaches to the door, and it transmits a signal when t he door is open (mercury switch?). A receiver in the house has red and gre en LEDs, and it shows red when the door is up and green when the door is do wn.

om Chamberlain and LiftMaster for under $100. Since Sears and OSH are both going out of business, you might be able to find one at a clearance price.

urself.

I wired magnetic alarm switches on my garage doors, stole power for the cir cuit from the IR "eye" circuit, and ran it to bright blue LED's right insid e my service door in the house. They are mounted in a low voltage box. Supe r bright and easy to see from across the whole lower level of the house.

The why did you post that you needed a schematic?

I did not realize that this is a conspiracy theory newsgroup.

A bunch of idiots reside here !

OGER wrote:

Mine is a tilt up door that the wind will wiggle so a magnetic switch probably will not remain aligned.

anyway, for $12, I get a PIR transmitter and receiver with a specific channel assignment. No wiring between them is required. battery life is over a year for the xmtr since I use an external battery pack.

I currently use such a setup to monitor motion in my home and the xmtr gets activate many times during the day proving battery life.

Terry Schwartz wrote:

Obviuosly so I could see if I could remove the PIR detector and substitute a mercury switch for garage door tilt up.

Modify the receiver to elim> >> Suggestions please.

How to win friends and influence people!

Peter Wieck Melrose Park, PA

If he continues on the usual trajectory, next he'll start bragging about how much smarter he is.

Cheers

Phil Hobbs

That was never mentioned until now. How could it be obvious? I'm thinking you are a troll.

I am not a troll but I can see that many here have big prejudice problems. Some think they are so smart and they are generating fake news right here.

I come here seeking help to a problem and get hog wash.

A few did make some suggestion worth investigating. Thanks to them.

Strange group here.

A friend of mine gave me the best suggestion and he is only a technician.