Automatic lighting in cabinets

I suggest making a really useful homemade product - kitchen cabinet lighting. Just imagine, you open the cutlery drawer and the light comes on. It's very beautiful and unusual. Such lighting can be equipped in any place, be it a pendant box or a closet with things and clothes.
LED lighting can be powered either by batteries or rechargeable batteries. They will not be completely discharged if you accidentally forget to close the compartment, since the backlight is equipped with a simple circuit with a timer. And the light will go off automatically after about 15 seconds.
This is what it looks like:
Automatic lighting in cabinets

Without backlight:
Automatic lighting in cabinets

We will need:


We will need

  • Three-pin reed switch.
  • Round magnet or any other shape.
  • Transistor IRF840, you can take a similar one.
  • Resistor 500 Ohm.
  • 300 Ohm resistor (optional).
  • 20 Ohm resistor (to reduce the current of LED strips - you can omit them).
  • Capacitor 22 uF.
  • 25 cm LED strip for 12 V. The size of the strip is of course at your discretion.
  • 8 pcs of “AA” or “AAA” type batteries.
  • 1 meter of wire.

A simple backlight circuit with a timer


The scheme is very simple. In fact, a simple time relay is assembled on a transistor.The load of the transistor is a piece of LED strip.
A simple backlight circuit with a timer

Or this way, whoever understands it better:
A simple backlight circuit with a timer

How does the magnetic contact of a reed switch work?


Everything is very simple. I bring the magnet closer to it and the middle contact rises to the top contact. I let go - everything returns to its original position.
Automatic lighting in cabinets

Backlight assembly with timer


Solder a resistor to the transistor.
Automatic lighting in cabinets

Solder the remaining parts of the circuit.
Automatic lighting in cabinets

Solder the wires to the LED strip and connect to the timer.
Automatic lighting in cabinets

Automatic lighting in cabinets

Assembling a battery from batteries


Roll it into thick paper. We solder wires to the outputs. We secure everything with tape.
Automatic lighting in cabinets

Automatic lighting in cabinets

Checking the timer operation


We measure the working time. If everything suits you, everything is fine!
Automatic lighting in cabinets

Automatic lighting in cabinets

Installing the backlight


We glue the LED strip to the required place. Nearby we attach the entire circuit with batteries.
Automatic lighting in cabinets

Automatic lighting in cabinets

Install the magnet on the drawer.
Automatic lighting in cabinets

Result of work


Without backlight:
Automatic lighting in cabinets

With backlight:
Automatic lighting in cabinets

Everything works without problems. I would like to add that you should not underestimate batteries - they will last for at least 2 years, and even with the most active use. I would certainly not recommend using batteries, as they have a high self-discharge.

Watch video instructions


You can see more detailed information in the video.
come back
Comment
  • bowtiesmilelaughingblushsmileyrelaxed relaxedsmirk
    heart_eyeskissing_heartkissing_closed_eyesflushedrelievedsatisfiedgrin
    winkstuck_out_tongue_winking_eyestuck_out_tongue_closed_eyesgrinningkissingstuck_out_tonguesleeping
    worriedfrowninganguishedopen_mouthgrimacingconfusedhushed
    expressionlessunamusedsweat_smilesweatdisappointed_relievedwearypassive
    disappointedconfoundedfearfulcold_sweatperseverecrysob
    joyastonishedscreamtired_faceangryragetriumph
    sleepyyummasksunglassesdizzy_faceimpsmiling_imp
    neutral_faceno_mouthinnocent
5+two=
Comments (1)
  1. Guest Andrey
    #1 Guest Andrey Guests 22 October 2018 20:08
    0
    Interesting article for development! To be honest, I’m surprised by the lack of comments from smart people and experts in the “put a limit switch” club, etc.)))