Can this be done?

[martysparky]

I'm looking for an occupancy sensor that would be suitable for a bed room.
The type that resets itself and does not go off when someone is being still whilst still in room any suggestions please.

Preferably I would like to wire it into the switch so the light is either on the sensor or off.

Any one know where to buy a sensor that will meet these requirements.

Thanks.

Can this be done?

 

[Notsosmart]

Most sensors will have a timer but depending on how sensitive they are will then dictate how much arm waving will be required.

Try this link, I have never dealt with this company so don't take this as a recommendation, I am however thinking of installing the ceiling PIR as my teenagers do not know that a light-switch also turns off

Prefect Thermostats Sensors and Controls

 

[martysparky]

Most sensors will have a timer but depending on how sensitive they are will then dictate how much arm waving will be required.

Try this link, I have never dealt with this company so don't take this as a recommendation, I am however thinking of installing the ceiling PIR as my teenagers do not know that a light-switch also turns off

Prefect Thermostats Sensors and Controls

Yes, thats my school of thought too..

I was reading about one that didn't require the arm waving but I lost the link. stupid me.

I will check your link out now...

Yes, been looking at those but the one I lost the link for resets itself I.e. resets the timer every time movement is detected and thus does not leave you without light if you have not moved. E.g. if you have it set to switch off 30 min after triggering it will pick movement up within that time and add another 30 mins.

Its my understanding Pir's generally switch off even if you have moved within the setting of the timer.

I think the terminology is occupancy rather than movement.

I think that a movement sensor is more suited to use when its more likely that the light will be most of the time of and need switching on for small times like a hall or toilet.

Occupancy is designed to be switched on for longer periods but switch of without occupancy.

Just don't know where to buy a cheap solution without going mad on automation.

 

[Spudnik]

Time Lag is your best bet

Time Lag Switch 2 wire 1-10 minutes

 

[martysparky]

Time Lag is your best bet

Time Lag Switch 2 wire 1-10 minutes

It doesn't look like the Time Lag will do as I need? As in my above post and below:

Essentially what I need is a occupancy sensor to use in a bedroom or kitchen so you walk in, light automatically comes on if the light switch is in the on position, and if your in the room 4 hours the light stays on the whole duration and when you walk out without manually switching the light off it goes off automatically.

Thus, the standard light switch in operation is functionally as standard (manually on / off) but if in the on position its auto day or night.



Really would like to find that sensor.

If the Time Lag does this please correct me if I'm wrong as with any post. Cheers Jason.

 

[ian.settle1]

It doesn't look like the Time Lag will do as I need? As in my above post and below:

Essentially what I need is a occupancy sensor to use in a bedroom or kitchen so you walk in, light automatically comes on I light switch is in on position, and if your in there 4 hours the light stays on the whole duration and when you walk out without manually switching the light off it goes off automatically.

Thus, the standard light switch is in operation just that but if in the on position its auto day or night.

Most motion sensors normally switch on when a movement is sensed and starts to time out then switch off. If it sense's another movment it will reset it's self and start all over again.

 

[baldsparkies]

Hope this helps. Either way its all dependant on movement

Motion sensors are often used in indoor spaces to control electric lighting. If no motion is detected, it is assumed that the space is empty, and thus does not need to be lighted. Turning off the lights in such circumstances can save substantial amounts of energy. In lighting practice occupancy sensors are sometime also called "presence sensors" or "vacancy sensors".

Occupancy sensors for lighting control use infrared (IR) or acoustic technology, or a combination of the two. The field of view of the sensor must be carefully selected/adjusted so that it responds only to motion in the space served by the controlled lighting. For example, an occupancy sensor controlling lights in an office should not detect motion in the corridor outside the office. Sensors and their placement are never perfect, therefore most systems incorporate a delay time before switching. This delay time is often user-selectable, but a typical default value is 15 minutes. This means that the sensor must detect no motion for the entire delay time before the lights are switched. Most systems switch lights off at the end of the delay time, but more sophisticated systems with dimming technology reduce lighting slowly to a minimum level (or zero) over several minutes, to minimize the potential disruption in adjacent spaces. If lights are off and an occupant re-enters a space, most current systems switch lights back on when motion is detected. However, systems designed to switch lights off automatically with no occupancy, and that require the occupant to switch lights on when they re-enter are gaining in popularity due to their potential for increased energy savings. These savings accrue because in a spaces with access to daylight the occupant may decide on their return that they no longer require supplemental electric lighting.