Questions tagged [reed]

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91 views

What does this circuit do? Reed switch debounce?

I'm trying to reverse engineer a pcb and I'm stuck on this circuit. I believe the capacitors maybe for debounce. The switch is a reed switch. Can anyone shed any light on it?
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1answer
470 views

Modify Ring Contact Sensor in a series of wired security reed switches

After reading the instructables post on the simplisafe sensor I modified the ring sensor and tried to integrate it with my wired sensors. This is what I found: testing with a spooled wire about 20 ...
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0answers
41 views

Using a PNP to enable a NPN current source not yielding expected current

Hi I am trying to switch on a brake light with a reed switch. The load is a 12v (0.1A) LED bike light. The following circuit works in the sense that the light comes on when the magnet moves away from ...
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2answers
121 views

Reed Switch Failure Modes

I've been playing with these through hole reed switches: MDSR-4-12-23. It has been my experience so far that you have to be very careful in handling them, including when bending the leads to 90 degree ...
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1answer
67 views

Timer activated by Reed on AC solenoid

Let me start by saying thank you for taking the time to read this - I really appreciate it! To the point: I am trying to create a 2-digit timer that resets and then starts at the activation of an ...
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1answer
33 views

Higher Voltage = Improved Signal Strength

I'm using a reed switch to detect the state of my garage door. It's connected to an ESP8266 via twisted cables of 1.5m and each line has a pull-up as the signal floats too much otherwise. Well it ...
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1answer
133 views

ESP8266 (esp-07) powered by battary(s) for at least 1 year

Hey all I am trying to see how long I can possibly have a ESP8266 ESP-07 operate with only 1 or 2 of the Lithium Ion Battery 18650 Cell which claims to have 2600mAh. I am making a window alarm sensor ...
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1answer
82 views

Trouble replacing a reed switch with a wired sensor along long stretches of wire

I have a wireless security door sensor, which has a reed switch, and I'm trying to replace the reed switch with my existing wired security door sensors (thus not having to mount the wireless door ...
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2answers
151 views

Tiny Magnet Sensor Switch

I know just enough about electronics to do the occasional Arduino or Raspberry Pi project, as long as I don't have to understand too much of what's going on. I am a software guy who dabbles in ...
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1answer
202 views

Some questions about a low frequency reed switch interface circuit

I need to wire this reed-switch rain-meter sensor to a counter input or to an isolated analog input channel of a data acquisition board. The sensor will be around 30 meters far away from the data ...
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3answers
228 views

Keep a circuit closed after activating a reed switch NO (normally open)

I need a circuit that it is open until I bring near a magnet that closes a NO reed switch for a short interval of time. I need the circuit keep closed for ever. Thanks!
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1answer
103 views

Thoughts on this circuit

Here I have a design ( Vcc = 12V ) where relay gets activated whenever reed switch gets closed. I want to activate the relay after a delay of about 2 to 3 seconds from the instant reed switch gets ...
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1answer
627 views

Reed switch melting closed in simple LED circuit — What resistor to use?

Made a simple circuit with a reed switch, wall power source and LED strip (for a bathroom occupied sign). Worked as I’d hoped at first. But, after a while, THE REED SWITCH MELTS CLOSED--leaving ...
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1answer
87 views

can you explain me the working of this circuit in detail? [closed]

this circuit is a occupancy light circuit i want to know the working of the transistor regarding base,collector and emitter in the transitor
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3answers
4k views

Why is this reed switch / solenoid circuit not working?

The (normally open) reed switch should close by waving a magnet across it, completing the circuit. The 6v solenoid lock should pull inwards allowing the door to be opened. When the magnet is removed ...
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2answers
800 views

Multiple switches to independently control a light

I am looking to create a simple circuit to control a couple LED light strips inside a cabinet using two reed switches that turn on the lights if either or both doors is open and the lights to be off ...
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2answers
137 views

what does this mark mean on reed switch?

I have some used reed switches with no datasheets. all of them have a black mark on one side. I want to know what does this mark mean?
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0answers
64 views

How to connect PBI to detect an open door

What's the best way to connect a wired magnetic contact stripe [edit: a "reed switch"] to the door, in order to detect whether or not it's open. I'm not interested in a wireless one, I'm building all ...
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1answer
385 views

How can I calculate the hysteresis of Reed sensor?

As question says, I want to calculate the hysteresis of Reed sensor and I don't know how. As I seen in Reed sensor's documentation, hysteresis may be x/y, or the difference between x and y, and I'm ...
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1answer
198 views

Hamlin Reed Relays for Audio: Sink or Source?

I'm building a small stripboard audio switchbox using some hamlin 5v reed relays (HE3621A0550, mouser link here). A small SPST momentary switch activates the relay. Wondering if the best practice is ...
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1answer
165 views

Brightness on reed switch LED decreases with voltage?

I've got a pneumatic cylinder reed switch sensor which has the internal layout as per the attached diagram: If I put 9v directly to it (without the load in the circuit diagram) then I get a strong ...
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1answer
42 views

Suggestions for the placement of decoupling and filtering components

The following diagram depicts a circuit intended for activation via reed switches. Q1 is normally conducting through the voltage divider R1 and R2. With Q1 conducting, Q2 is biased off (non-conducting)...
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1answer
59 views

How to get the “max” from two inputs?

Question: Is there any way that I can change the signals from two inputs into the max signal from those inputs? Such as, ...
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1answer
57 views

Is my reed relay defective?

I've got a couple of these 9001-05-01 reed relays. I've tried activating them by applying 5 VDC voltage through pins 2 / 3. This connects pin 1 to pin 4, as I expected. But, after disconnecting pins 2 ...
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3answers
2k views

How to turn on module like ESP8266 only when switch is activated?

I'm looking for a way that the ESP8266 (or alternative, like an Attiny85 with an RF module) is only turned on once a reed switch (or similar sensor) has been triggered. The problem is that the ...
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2answers
1k views

Snubber Circuit Suggestion

I am seeking some feedback in improving the reed switch snubber protection circuit shown below. The switch will drive a coil of an AC relay. Please note that the AC relay coil is not accessible. Any ...
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1answer
1k views

How to add bouncing to a switch in LTspice?

Is it possible to add bouncing for a switch in LTspice? Below is a reed relay simulated in LTspice. I can set the on and off resistances but is there a workaround to create bouncing as well? With no ...
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6answers
624 views

How to prevent sealed in product battery drain on store shelf?

How can a microcontroller-based device prevent battery drain while the product is on the store shelf? We are creating a waterproof, sealed in product without any buttons. This means the battery is ...
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2answers
473 views

Is reed switch sensitive to DC magnetic field?

How would I know if a reed switch in parallel to a DC wire in which is flowing current can be closed by the magnetic field produced? If yes, what's the minimum current required?
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2answers
839 views

2 NO reed switch - turn on 230V water heater

For a small home project I would like to turn on a water heater using 2 NO reed switches. Once I put a small magnet ontop of the reed switch (turn the reed switch to Close), the water heater will be ...
1
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1answer
964 views

Reed switch sensitivity

I've built a setup where I've placed a reed switch near the water meter in my house. Every 0.5 litre the switch gets triggered and my Raspberry Pi does the rest of the work. My gas meter also outputs ...
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1answer
205 views

Controlling an electromagnetic switch with Reed switches

I'm trying to power a 12v electromagnetic switch using NO reed switches. IE: when the 5 reed switches all have magnets near them then the elecromagnet switch unlocks something. However, I'm trying ...
5
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1answer
256 views

How do I prolong the reed switch output time

I put a reed switch ( https://en.wikipedia.org/wiki/Reed_switch ) on the handle of a measuring wheel (perambulator). The reed switch will be activated up to around 20 times per second (every 50 ms). ...
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1answer
504 views

Magnetic switch with no moving parts

Is there a magnetic switch (like a reed switch) but with no moving parts? I need a switch that can be turned on by a magnetic field but won't move around due to tremendous shock absorption.
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3answers
1k views

Preserve a LED ON after the activation of a reed switch

I came across a simple circuit in which when a reed switch (which is normally closed) is activated then a LED is being turned on (the LED turns ON when the switch in closed as it is depicted in the ...
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3answers
1k views

Passive circuit to generate a pulse when a door opens/closes?

I've searched a bit here, for example https://electronics.stackexchange.com/search?q=pulse+switch, but I haven't quite found what I'm looking for. Here's the actual problem: I want to send a signal ...
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3answers
842 views

Convert reed switch disconnection or SPST off to single “LOW” pulse

I'm trying to wake up my Arduino and run some code when a reed switch or SPST switch connected to an interrupt is opened. If my Arduino is in powered off mode, only LOW interrupts are accepted (not ...
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2answers
873 views

How to find a way to detect if a device was open or not

I'm making a device which is inside in an enclosure and at this point of the project it's relevant to understand if the enclosure/box was open. I was trying to understand if I can try to figure it out ...
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5answers
11k views

Why are some generic door alarm magnetic switches built using Normally Open reed switches instead of NC type?

Some generic, low-cost "door alarm" magnetic switch components are made of using "Normally Open (N/O)" type reed switches, ie, when the magnet is in proximity, the current stops flowing. If I were ...
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1answer
545 views

Hall-sensor replacement for reed switch

I have a device in which a reed switch is encased in potting compound. (So impossible to identify.) My problem is, that for my application the switch is too slow. I am considering replacing it with a ...
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2answers
204 views

How do i count a fluctuating 22.1v (11.5v) pulse from reed switch with Arduino?

It has come to my attention that my first description of my problem was very cryptic, so I have tried to rewrite it for better understanding. I have an actuator that measures 8 pulses/rpm and there ...
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1answer
170 views

Circuit with 2 reed switches (proximity sensors) output to single GPIO

I would like to use 2 magnetic proximity sensors (normally open reed switches) to determine the position of a chicken door (vertical sliding door) which in turn controls a motor. If the door comes ...
1
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1answer
801 views

Ultralow power reed switch signal reading with mcu

I'm a newbie in electronics. I need to build an ultra low power (nA) reed switch signal reading for an mcu. I'm using the following schematic diagram. The Vo output goes on a mcu input pin that is a ...
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1answer
720 views

How do I determine what magnet to use for a reed switch?

I'm looking to buy this reed switch but I don't know how to choose a proper magnet. I would like the optimal distance to be ~1 inch.
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2answers
590 views

Hall effect sensor or Reed switch unique identification

I would like to use a hall effect or reed switch as a proximity sensor, but also want to get identification of the item being sensed. There would be about 30 unique items. Does anyone know of an easy ...
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3answers
6k views

Magnetic reed switch current ratings

I wish to use some 12 V, 5 W xenon light bulbs under separate shelves of a cabinet. I'd like them to power-on using a magnetic reed switch attached to the cabinet door. The magnetic reed switch I ...
0
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1answer
240 views

Reed switch current sense

I'm working on a home project where a microcontroller records time when outdoor lights are switched on/off. Outdoor lights are 220V activated by built in PIR sensor. They're located outdoors 20-30m ...
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2answers
237 views

What components can be damaged through 10KV ESD?

I'm designing a circuit which has Voltage regulator(IC), current source(IC), resistor, capacitors, LED, reed switch and capacitor. It has to survive 10KV ESD event. My question is: 1) What components ...
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3answers
753 views

Need to close or open a circuit (and keep it that way) with magnet

I need to build a circuit that closes when it detects the passing of a magnetic card. It should open again when the card passes again. So I need a simple magnetic reed (like this one). And some kind ...
3
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3answers
2k views

Reed relay driving solenoid “sticks”

I have a transistor, driving a normally open reed relay (protecting transistor with flyback diode), driving a solenoid. The solenoid is actuating at about 3 Hz. The relay is good for a few million ...