Re: LED night lights with PIR sensor

["Stuart Meier" <stuartmeier@xxxxxxxxxxxxxxxxxxxx>]

> Still looking for a source for these, no luck so far so now teetering
on
> the brink of rolling my own from a cheap PIR and a stack of LEDs.
Before
> I pry one apart, anyone know how PIRs work and what power they need? 
I
> presume they are not really passive, but need some juice?   Battery
> power will allow optimum positioning,  but no good if the batteries
only
> last one night

At PCB level, expect them to operate at around 5-9v. Power usage is
non-trivial,
probably of the order of 10-20mA. Battery models will have some sort of
power
reduction strategy (eg sleeping 90% of every second or whatever). Together
with
the power consumption of your LEDs, you will be consuming batteries pretty
fast.

I'm going to use a few LEDs externally, but they will get power from a 240v
PSU.

StUart