Night Light to Motion Sensor Magic!

If you find yourself in possession of a rechargeable night light, coupled with an aluminum alloy light slot and a 5V light strip, there's a clever transformation awaiting you. By harnessing these components, you have the opportunity to fashion a shoe cabinet motion sensor light, a handy addition to your living space that marries both utility and innovation.

A rechargeable night light, along with an aluminum alloy light slot and a 5V light strip, you can convert it into a shoe cabinet motion sensor light. Start by examining the bare light strip. A 1-meter length is just right for a shoe cabinet light.

The individual LED beads in this light are resistor-limited, with adhesive backing for easy attachment inside the light slot. 

At 5V, they appear to be around 2.5W.

The rechargeable night light can be used for infrared sensing and driving.

The LED beads in this light lack current-limiting resistors. Testing with a multimeter shows that the VCE voltage of the driving transistor is at 0.8V, and the waveform observed is direct current.

It's possible that the transistor is too small. 

If you switch to a 5551 transistor with a TO-92 package, the light strip is still not bright enough. Moreover, the VCE voltage remains around 0.8V.

The base resistor of the driving transistor, which is 10k, might be a bit high, causing it to operate in the amplification region. You can parallel another 1k resistor to it. This will make the light strip slightly brighter.

Now the VCE has dropped to 0.4V.

If you feel uncertain, you can try using a MOSFET. Once the brightness is sufficient, the VDS will only be a few tens of mV.

Connect the original light beads on the light board in series with a 27Ω resistor for current limiting. Connect the positive end of the light strip to a 5V charging input, and directly drive the negative end with the MOSFET's drain.

Without plugging it in, the original light board illuminates when triggered.

Once plugged in, the newly added light strip lights up simultaneously, with different color temperatures that don't interfere with each other.

During on-site assembly, use the aluminum alloy light slot, 1 meter in length, with the 1407 specification.

Once you've affixed the light strip, if you don't plan on using screws, you can also use double-sided tape.

Pre-calculate the installation positions to effectively illuminate the open shelves in the shoe cabinet and most of the entryway floor.

Attach the light slot, and the rechargeable night light can be subsequently affixed based on the actual position, with the light strip illuminated. After turning on the light, the illuminated area is sufficient.

With the added motion sensor night light, you won't need to manually switch the entryway light anymore.

Embracing this motion sensor night light seamlessly integrates smart technology into your environment. Say goodbye to the days of searching for switches in the entryway.