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long-term low-glowing light (like a night-light) with a PIR/ daylight sensor using a car battery Answered


Apologies in advance if this has already been asked many times, I tried looking through the archive and couldn't really find a solution to my project idea.

I want to know if it is possible to create a long-term low-glowing light (pref with a PIR/ light sensor) powered by a car battery which I could leave in the woods (gently lighting up an ornament for example) and re-charge every couple of months? or even put an off-the-shelf style trickle solar panel onto which can be trailed into a sunny spot.

I'm up for building something from parts, soldering LEDs etc but only tried in-car LED strips before straight to the battery and don't know how to source or insert a sensor to light up only when its dark or if someone approaches and preferably not having to charge the battery too often.. In an ideal world it could just sit there and only light up when somebody approaches it in the dark/twilight (do you get where I'm coming from?)

Over to you guys! Thanks in advance!



3 years ago

You probably wouldn't be able to change it every couple of months because a car battery probably wouldn't last that long. You'd also need to make the light really dim, to the point where it barely lights up, and pretty much noi current...

Did you consier adding solar paneks?


3 years ago

"Long term" and "glowing" can have quite different meanings.
Next thing is the sensor.
For long term you need either a big battery or really low overal power consumption - or something in between to compromise.
Take these ready to go solar shed lights you can get online or in most hardware stores for cheap.
Some have quite nice claims in terms of light output or how powerful the LED is.
But you need to read the fineprint to find out for how long you will actually have continous light.
Some path lights offer a dual mode - low light illumination by default, full illumination if motion is detected.

So you really only need to look for something like the above with a suitable sensor, solar panel and battery.
If in doubt upgrade (or double) the solar panel and battery, for example by buying two units and adding a cheap solar charge controller.
Otherwise just grab a bunch of solar garden lights and point the LED's to where they are needed and forget about it.


3 years ago

Here are a couple from Instructables.