Help with Reed switch

Other Hardware General Electronics
1

I am trying to make a light go on when door is open using a Reed Switch .But i don't want to use any programming board for this .Is there any other way to light the bulb

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3

Brother Need the Light to on when magnet is apart from sensor not near to sensor

4

What is the power source?

I have a cupboard where the light comes on using a Hall effect sensor and a MOSFET, with a 12VDC power supply. Same would work for a reed switch.

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Are you not aware switches can be N.O. or N.C.?

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Yeah Currently i have is N.O

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i was hoping to light some led strips i guess 12v will do that. May be 5V

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That should have been in Post #1... and you bought the wrong switch.

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You need an N channel MOSFET and a resistor. Reed switch between Gate and Source, LEDs between Drain and +12V (or 5V), 0V to drain. 10k resistor between Gate and +12V (or 5V).

Do you need that as a schematic?

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10
  • You need two magnets.
  • The First magnet is attached to the reed switch so it closes.
  • The Second magnet is on the door.
    This second magnet is orientated so it repels the first, i.e. cancels the fixed magnet reed switch attraction.

Edit

Correction made.

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11

You could have also bought a single pole change over reed switch like this one
Single Pole change over switch

Download the data sheet for this part as well from this page.

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If you can provide that it would be helpful

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Sry my mistake . i didn't know much about that part . I thought there is only a single type

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Does the two Magnet needed to be same size

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Reed to MOSFET
Reed to MOSFET1057×899 91.6 KB

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16

Yes, and same type, and same distance, so that their magnetic fields cancel out and the reed is not activated.

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17

The reed switch could enable a relay which has both N.O. and N.C. so you can choose how to switch the light.

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18
  • Not necessary.
    The magnets can be different sizes.
  • A few minutes of tuning will easily get things working.
  • The magnets do not physically touch at any time.
    When the door is closed, the magnets are set to about 1/2” apart at their closest.
  • Actual placement depends on magnet size, shape, strength.
    You just have to experiment with placement.
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19

I used these switches You just have to make sure your LED's don't draw more current that they are rated for.

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Thanks for the help everyone. There are multiple solutions here is there a way to tag multiple post as solution