some sort of pulsy device

[RF Lighting]

As we don't have an electronics section, I'm posting this here.

I am after a device which will close a volt free normally open or normally closed contact, after a defined time of probably 5 - 30 seconds, but if possible without being triggered by anything external.

Preferably ELV

It is for control purposes only, and will only be switching mA

Any help would be much appreciated

 

[ricicle]

Intelligent relay, small PLC?

 

[jwilliams]

555 timer configured as a flip-flop?

 

[Lectrician]

Sounds like a recyling timer? Off the shelf.

 

[Pensdown]

If it's not triggered by anything external when does the 5-30 seconds start or is it cyclic?

 

[Lectrician]

There are combination timers on the marker - delay on, delay off, delay on from pulse, delay off from pulse etc etc.

 

[RF Lighting]

it is to trigger a PTZ camera controller after it has been operated by a PIR, to return it to preset 1


basically if a pir is triggered it sends a signal to the camera, which moves to the corresponding preset. It stays there until it receives another input. I want it to return to preset 1 after say 15 seconds

The controller will accept a signal from either a NO or a NC switch pair.

I was thinking of using a timer to pulse timer 1 maybe every 15 secs or so.


I may have a spare NO / NC contact on the PIRs wich I could common up to start the timer counting to 30 seconds before it sends a single pulse, acter the PIR has sent a pulse to the controller

 

[JohnD]

edited

mistake

 

[RF Lighting]

Thanks for your help people.


I may have solved the issue though,

It seems the PIRs I have have 2 relay outputs, each of which can be programed for alsorts, including having a delay before they send a pulse, so that will hopefully do just what I want

 

[saxondale]

Thanks for your help people.


I may have solved the issue though,

It seems the PIRs I have have 2 relay outputs, each of which can be programed for alsorts, including having a delay before they send a pulse, so that will hopefully do just what I want

you can get them to trigger if someone takes the plastic dome cover off - dont go there