List). Drill a one inch hole for the sensor and (optionally)
three smaller holes for the adjustment pots. Figure 3
shows how using chassis jacks (see optional Parts) for
power and the LEDs looks professional, but I can’t
recommend using identical jacks for different functions —
no matter how well labeled — if you are making this for
someone else. (Just my experience.) Also, this
configuration works better with two four-pin headers next
to each other, wired as in Figure 4.
Adhere the LEDs. Your aisle lighting is ready for takeoff (Figure 5). Plug the unit in, wait for dark, and watch
your kid’s faces as they approach for the first time and the
strip pops on magically! Tape over existing light switches
to break carbon-footprint-insensitive humans of their
wasteful habits (install manual switch S1 only if
threatened). One meter of white LEDs produces 660
lumens — more than a 40 watt incandescent.
Even compared to CFLs, LEDs are twice as efficient
and last six times longer. Go green! NV
24 August 2015
Five Meters can Make
More than One
The LED strip can be cut every three inches (it's marked), but
realistically you will want larger pieces. Suppose you want one
meter (three feet) for accent lighting a fish tank (unless it would
drive the fish crazy). If five meters (blue or white) uses 1.5 amps,
then one meter needs about a 350 mA supply. The motion sensor
uses a negligible 1 mA, so a $3 wall wart will suffice.
Cut underneath the PVC and peel back to solder leads to the
top (Figure A). Unintuitively, the bottom doesn't solder well. Blob on
silicone sealant to protect.
• If your closet doesn't have a light, it should. If there is a light,
it's burning right now because the door is shut and no one knows
it's on. Put LEDs around the upper molding. Aim the motion
detector at the doorway.
• A short blue bathroom nightlight won't hurt your eyes.
• Under-cabinet lighting makes your kitchen counters pop.
• PVC coated LED strips are weatherproof, so deck out your
deck, patios, and porches. Just make sure the rest of the circuit is
protected (MPJA has sealed enclosures, too).
• Enhance indoor or outdoor Halloween or holiday
■ FIGURE 3.
■ FIGURE 5.
■ FIGURE A.
■ FIGURE 2.