thank you for this video. brings clarity on how door alarm sensors work; I am trying to figure out how it works so I can properly detail it in my product proposal.
Great explanation But you could demonstrate how the switch reacts as the magnet is moved across the switch from end to end. The switch reacts to the magnetic field and the switch can be more sensitive in some areas than others and at the mid point might not even work at all !
Yes, it seems with a lot of these reed switch videos the orientation of the magnetic field is not made clear. It is a bit counter intuitive that you bring the magnet poles alongside the reeds (parallel to them) not one pole directed at 90 degrees. In a reed relay where the reed is inside a solenoid the same is true - the magnetic field lines run parallel to the reeds. The very tips of the contacts are coated with a metal that is not chosen for magnetism but for good electrical conductivity. The reeds are made of a 'soft' magnetic material and when a magnetic field is near them they become magnetised and overcome the 'spring' force that keeps them separated, and stick together. Remove the magnet and they spring apart. Hope that helps a bit.
Are they susceptible to vibration? i was thinking of putting it on an ebike to make a speed limiter switch but im worried that the switch will vibrate during the ride.
Pole doesn't matter. It's just a piece of steel attracting to the magnet. However, there is directionality to the switch. You have to put the magnet on the correct side of the switch or it may not work.
we live in a fast paced world. we want everything instantly. change your perception and be grateful this informative video exists and that you encountered it
