Programable Motion Sensor Night Light

By Dan Chen, January 10, 2016

I always have trouble finding light switches during the middle of the night in the dark or entering a pitch black room when I get home. That is why I created this customized and programmable night light.

For this custom design night light I want to have the following criteria

  • Motion activated
  • Light slowly fades on and off
  • looks good
  • cheap
  • programmable
  • usb powered
  • Sensor sensitivity adjustment
  • good night light or motion activated light

For this project you will need

  • Hot glue
  • Laser Cutter
  • Acrylic
  • Sand Paper / Sand Blaster
  • Motion Sensor / HC-SR501
  • Attiny 85 / Adafruit Trinket / or any micro controller
  • Mini or Micro USB Female Jack
  • LED Strip or USB LEDs (Warm White)

 

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I used 1/4 inch Acrylic for this project. The cut lines in the middle will create 2 pieces for us to interlock, there will be very little waste but does not allow us to friction fit the pieces.

You can download the cut file HERE.

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It will take a little while to cut through 1/4 inch acrylic, you might need to do multiple passes to cut through.

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After cutting all acrylic pieces, I removed the protective film then sand blast the surface at 60 PSI, you can also use 800 grade sandpaper for this. make sure you do this for both sides.

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The motion sensor should fit perfectly to the acrylic piece that has a circle on it. If you are using a smaller motion sensor, you will need to modify the ESP file.

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Use the square end pieces to secure the whole structure. You can use acrylic glue, but here I am using hot glue from the inside instead because it’s faster and won’t leave melted acrylic glue mark.

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I took a micro usb male to female extension cable and fitted it to one of the end piece that has a rectangular hole. You should resize this hole in the included ESP file before cutting just in case they are different. This port will provide the power and ability to program.

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I purchased these cheap and bright LEDs from amazon, but they are touch activated, so I disable them by solder the pins as marked in the attachment.

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You can also use 5V LED strip or any 5V LED.

Trinket is programable via USB via the extension cable which leaves the female jack on the exterior.

I wired the LED’s + VCC to pin 4 on Trinket and LED’s GND to Trinket’s GND.

I wired the sensor pin to pin 1 on Trinket.

See code HERE.

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I wired up 5 LEDs.IMG_1984

 

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