Let's Make Robots!

Switch a Light Using a Magnet

Turn Lights On and Off

Does your bedside table give light when you open it?

In a discussion with a carpenter about his furnitures I asked about the usage
of electronics in his creations. After some additional explanative words and
examples like "Turn light on when bedside table gets opened" or "Midi output
on a chair that is like a Cajon drum" or "Embedded screen in a table" he got a
glimpse of the additional values electronics could bring.

So a few weeks later as we sat together again he came back to me with the
question if we could make something together and showed me a bedside table.

"Can we make something that when the door opens the lights go on?"

"Sure we can." I replied.

On the way home I thought about different switch solutions, their pros and cons. Given
that the switch must not have physical contact is a pro since the lifetime of the sensor
might be very high and the lifetime of the furniture too. 

So I headed home and breadboarded this schema using a Hall Effect Sensor and a
NPN Transistor. 

 

 

This little device can be embedded into the furniture of the carpenter...
...looking forward to what he is doing with it.

 

Some Impressions from the Making

 

 

Further Readings

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...an other one. A bit smaller and tigther.