Author Topic: Magnetic switch inside a dive light  (Read 230 times)

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Offline e100

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Magnetic switch inside a dive light
« on: October 25, 2020, 02:10:50 pm »
Has anyone pulled apart a reasonably modern waterproof dive light to reveal the switch mechanism?
Some have a rotary control that wraps around the body like the focus ring on a camera lens, other have a rotary control perpendicular to the body.
Is it a reed switch (or series of switches) or a magnetic sensor IC or something else?
 

Offline geggi1

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Re: Magnetic switch inside a dive light
« Reply #1 on: October 25, 2020, 02:19:12 pm »
most likely is it a Reed switch with a transistor or relay driver.
https://www.pickeringrelay.com/what-is-reed-relay/
 

Offline free_electron

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Re: Magnetic switch inside a dive light
« Reply #2 on: October 25, 2020, 03:31:54 pm »
All the light & motion lights use hall sensors Allegro 3 pin sot23
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Any comments, or points of view expressed, are my own and not endorsed , induced or compensated by my employer(s).
 

Offline Doctorandus_P

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Re: Magnetic switch inside a dive light
« Reply #3 on: October 25, 2020, 07:55:13 pm »
I happened to have a HALL sensor stuck in a breadboard in front of me, so I put a DMM in it's power supply.
It constantly sucks over 3mA from the power supply, which is not a very good thing for a battery operated gadget. REED switches do not need any power to preserve their state.
 

Offline free_electron

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Re: Magnetic switch inside a dive light
« Reply #4 on: October 25, 2020, 08:57:54 pm »
light and motion uses a very low power mcu ( gecko) and they pulse the power of the hall sensor a few times per second for a few microseconds.
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Any comments, or points of view expressed, are my own and not endorsed , induced or compensated by my employer(s).
 

Offline drvtech

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Re: Magnetic switch inside a dive light
« Reply #5 on: October 25, 2020, 11:41:20 pm »
I happened to have a HALL sensor stuck in a breadboard in front of me, so I put a DMM in it's power supply.
It constantly sucks over 3mA from the power supply, which is not a very good thing for a battery operated gadget. REED switches do not need any power to preserve their state.
You can get MUCH lower power Hall effect switches. Look up DRV5032. Less than 1uA under certain conditions.
 


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