Questions tagged [reed-switch]
An electromechanical switch controlled by a magnetic field applied to it. The metal contacts are flexible and somewhat resemble parts of reed plants, hence the name. A magnetic field causes the contacts to flex to either make contact with each other or produce a small air gap between them. Use for questions about reed switches, and in conjunction with the "switches" tag. Also consider using in conjunction with the "relay" tag, if applicable.
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Converting reed switch from NO to NC
Does anyone know how to use a normally-open reed switch in a way that is "normally-closed"?
I have a device that needs a reed switch attached to its power source. This is because when it is ...
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Single-use switch
What are the options for single-use switches to turn the device on?
Intro: I am working on a project where I want to have a completely encapsulated device (no ports or opening), but it should have a ...
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Dual edge detector with binary counter doesn't count correctly
I want to build a circuit that counts the on and off of a reed switch in a CD4040 binary counter.
I wired the circuit below in a breadboard. This has a debounced switch connected to a 74HC86 that when ...
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Reed Switch alternative IC, AMR or TMR
I have a prototype that I have built which has 4 positional reed switches arranged in a square around a circle. There is a rotating magnet as shown below:
I would like to replace them with solid ...
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Protection for unpowered ADC module
I'm trying to measure a low frequency (0.1 - 100 Hz) signal with an ADC module. After powering the sensor up the signal can have common mode voltage from -15 V to +15 V and is tuned manually (the ...
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Making an automated chessboard [duplicate]
I want to create an automated chessboard. At the moment, I'm making the project and deciding what technology to use to detect which piece is at what position and how to move them. I'm not so skilled ...
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ESP32 based door/window sensor using a reed switch (logic issue)
I have an ESP32-based reed sensor used to monitor door and window events. ESP32 is put into deep sleep mode, and the reed switch is connected to a RTC pin in order to wake up the MCU (external event ...
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On/Off switch for a sealed underwater container
I know this can be done, I just can't put my finger on exactly how to wire it up. I have an underwater housing that I seal up indoors and take out on a boat. The device inside needs to be turned on ...
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Reed Switch Selection - Quality Control
I have a piece of hardware which uses reed switches and neodymium magnets. When I attempt to produce this hardware in batches I find that some reed switches that I have are more sensitive than others ...
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Reading the markings on a reed switch
I have the following reed switch.
The markings are:
170-842
N/O3
I'm not entirely sure what they may mean. It is used in a DC application to power a 24V, 6A DC motor, but that is all I know about it ...
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Placing a reed switch behind a metal plate
If put a reed switch behind a metal plate in plastic casing and have the bar magnet sweep across the plate in parallel, would the reed switch activate? I would try it myself but the reed switches that ...
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How can I set up a reed switch/magnets on an electronic chess board to consistently detect pieces?
My goal is to build a chess board that can detect the movement of pieces on it. My current approach that I'm testing is to have a reed switch underneath each square and magnets attached to the bottom ...
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Turn on load BJT, MOSFET or Relay
I want to turn on a load of around 1.5A with a reed switch. I tried to just use a reed switch but found out pretty quickly that it will not take the current.
I was considering a BJT but there is a ...
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Multiple LEDs with reed switches for testing magnet placement
I'm adding MIDI to an old electric organ (saving the existing internals for dual operation). I will be using reed switches and magnets at every key for action.
For testing magnet+reed positions I ...
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Detecting magnets regardless of polarity
I'd like to build large matrix of sensors to detect objects placed on it. I can place magnet or metal inside detected pieces. I tried to use reed switch and hall sensors. Hall sensors seems like ...
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