Questions tagged [hall-effect]

The Hall effect is the production of a voltage difference across an electrical conductor by a magnetic field.

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Hall effect to increase voltage

My knowledge of electrical engineering isn't great but faced with a challenge I do have a habit of learning enough to see it through. There is a probably a very simple solution to this. I've been ...
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Is it possible to chain Hall sensors?

I'm working on a hobby project that is to add sensors to a wooden chess board in order to detect if a piece is on a given square. I'm quite beginner at electronics, only experienced in programming, ...
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How to scale my hal ratiometric sensor output?

I have a UGN3505 sensor that converts magnetic flux to voltage. The output at zero magnetic flux is 2.5V and the difference in the flux depending on the polarity varies the voltage from 2.5V. I want a ...
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Calculate magnetic field intensity from induced voltage

I have a coil A (not a solenoid coil, just multiple winding) with N turns and diameter D connected to a function generator (sine wave, triangle wave, square wave). This will make coil A generate an ...
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How to use a Hall effect sensor in a rotary encoder?

I'm designing my own rotary encoder using magnets and a Hall-effect sensor. I'm not getting the linear output I was hoping for. I'm using two magnets and putting the sensor in the middle - like this: <...
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BLDC Y-shaped motor with Hall sensors generating different combination of back EMF on windings with different direction?

I have a BLDC Y-shaped motor. I connected the Hall sensors and winding to a logic analyzer to see the combination of back EMF on thr windings. My intention is to eventually create a commutation table ...
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Hall effect current sensor ACS712 for battery application

I want to measure the current of 12V lead acid battery for charger application. So mostly, I need bidirectional current sensing.The current measurement can be done using shunt resistor or using hall ...
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815A Micronas HAL sensor programming

I am trying to program an 815A HAL sensor made by Micronas. I read the datasheet and made the following bitbang to read a register value. No success! Has anybody here worked with this sensor?
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Effects of magnetic field on conductor windings

I'd like to know if there is any effect inside a conductor while it's resting in a magnetic field. More precisely with the HAL effect, which can only be measured across (perpendicular) to the ...
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Return path magnetic field on hall effect current sensor

We would like to use a toroid core and hall effect sensor shown in the figure below for measuring current in an Electric Vehicle from a battery pack. Questions are: Would placing the wire carrying ...
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Shaftless Hall encoder

Shaftless hall encoder I am building a robot, and one of the stumbling-blocks I found was motor positional control. It seems like the Quadrature encoder is a good choice, but I have no rear axis on ...
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Detect stepper motor movement using a Hall Effect sensor

Is it possible to detect that a stepper motor is rotating using a Hall sensor against its body? Kind of a simple detection mechanism for motor stall without moving parts.
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Remove DC offset from a Hall sensor output

Here is the test circuit for an encoder output from a car seat motor. It seems the output signal has a DC offset of 4.5-5V. How do I convert this signal to a 0-3.3V level?
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How are these hall effect sensors connected?

Trying to understand how to wire the hall effect sensors from a car seat motor. The part # given in the image below seems to be an Allegro device. I can't figure out how to wire these. It seems pin 2 ...
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The best control strategy to determine the 0 position of a hall sensor linear actuator

I am using a TA29 Timotion, with hall sensor as a feedback. To determine its position, the actuator should be in position 0, before it starts counting. What is the best way for me to do this without ...
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How do I effectively trip a digital Hall effect sensor with low current. Magnetic field amplification?

This is part of a more complex project for school but here is what you need to know to help me. I have a DC voltage from 0-5 volts I must include a resistive load. The Hall effect sensor trips a ...
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Isolate coil from battery using two transistors triggered by Hall sensor

My current, simplified pulsed electric motor driver circuit is shown in the image below on the left. The base of the PNP transistor is connected to a A3144E Hall sensor, and this pulses the coil when ...
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Hall Switch AND gate

I am building a motor with permanent magnets in the rotor, and I need to pulse the stator coils at the right time, and need to be able to adjust the duty cycle. My plan was to use not 1 but 2 Hall ...
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Hall Effect Current Sensor for a DC Mosa Welder - Only info is 250A, it reads the + welding cable current output - ideas on make?

I wish to test/replace this sensor with the same or similar spec. if possible. Its worn inside due to the positive cable rubbing against it for years. All there is for a description from the Italian ...
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Pintech PT-710 sensor identification problem

Welcome all. I need some help with identifying a component. Recently I opened my Pintech PT-710 current probe and tried to see what type of sensor is used. Inside the jaw there is a single sensor ...
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Can I damage a hall effect sensor with too much current?

I'm sensing the output current of a transformer which can get up to 250A. However, I'm only interested in turning on a separate circuit if this current exceeds 10A. If I use a 0-15A hall effect sensor ...
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Getting rid of offset in hall sensors

I would like to know how it is possible to remove (external) offsets like temperature and unwanted magnetic fields when using a hall sensor. As far as I know this should basically be possible by using ...
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BLDC Motor underwater ; weird behaviour

I recently was riding my e-bike (with a bldc hub motor) and decided to cool the motor (it -the stator- was approx 100-150 celcius I think) in the river. The controller is on the top of the bike and ...
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Left Hand Rule vs Right Hand Rule and the Resistance Generated

Some say that Hall effect takes place prominently only in semiconductors because their impurities create resistance in the presence of magnetic influence, but in case of conductors like copper such ...
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Need Hall sensor output to be 5 volts (high) instead of 0 volts (low) when magnet detected

First time asking a question here. I have a Hall sensor A3144 that goes to low when a magnet activates it. So I can use a magnet with it to complete a circuit, say, connecting the output to a red LED ...
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Melexis sensors how to get PWM output?

The Melexis MLX90372 datasheet says that it can output either SENT protocol or PWM. I do not see anywhere in the datasheet how to put it into "PWM Mode" as they call it. Nor do I see how to ...
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Hall effect sensor through plastic

I was wondering about the viability of adding a Hall effect sensor which can sense a magnet through a plastic cover. I'm interested measuring the angular velocity of a motor through a plastic cover, ...
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Replacing potentiometer with a hall sensor in PWM DC motor control module

I have a DC Motor Speed Controller (PWM) that uses 100KΩ potentiometer to adjust motor speed. And I also have an electronic throttle pedal that used 49E Hall-Effect sensor (+5V, 0.8-4.2V signal, 1KΩ). ...
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Capacitive Switch To Distinguish Between Metal and Plastic

I have an application where a rotating plastic wheel has ferromagnetic inserts on the circumference of the plastic wheel (they don't stick out). Shown below in the picture is the plastic wheel (black)...
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Replace magnetic sensor - help identify 3-pin IC marked “W10” and “1095”

We have an instant gas hot water system that is not initiating. I've traced it to the water flow sensor not signalling when water is flowing. After inspecting the housing, the magnet is spinning ...
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Can these small Hall-Effect Current Sensor Modules really handle 30A?

These don't look like the could reliably handle 30A to me. The terminal block is small, the chip is tiny. Please help me understand what the considerations are when sizing components & traces for ...
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Brushless DC motor - number of hall sensors

When we have hall sensors inside a BLDC to use as encoders for the processor, I saw some diagrams on web showing 3 output signals (open collector outputs, need external pull-ups to the VCC of ...
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Are hall effect sensors ratiometric?

I am working on the Arduino magnetic levitation project and it requires "ratiometric" hall effect sensors. On amazon and adafruit there are no hall effect sensors that are explicitly "...
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Best way to select a hall-effect sensor and a magnet that work well together

What is the best way to select a hall-effect sensor and a magnet that will work well based on the constraints of a specific project? Say, I want the sensor to detect a relatively small magnet ...
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Hall effect current transducer schematic diagram

What is the function of the amplifier 2 in the below circuit diagram? HCT-0016 Hall Effect Split-Core Current Transducer: https://www.magnelab.com/products/hall-effect-split-core-current-transducer-...
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How to detect when an LED has burned out?

I'd like to have a way to detect when a low power LED burns out (2-3.5v, 200-400mA) that is being driven using PWM from a Raspberry Pi with a MOSFET. My understanding is that I would be able to ...
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Non inverted OpAmp & Shunt circuit not working

I am trying to measure the output from a Hall effect sensor (LEM-LF 310-S) for a welding application. The maximum output of the sensor is 0-0.25A when sensing 0-500A. This range I need to convert to ...
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How to wire this linear Hall effect sensor

I want to measure alternating magnetic fields 50 Hz to 100kHz. I have the Honeywell SS 495 A linear Hall effect sensor and have used it like in the circuit diagram: . I could successfully measure a ...
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Hall sensor confusion with unipolar and bipolar as well as magnetic induction sensitivity

I want to create a simple bicycle computer that shows my speed and RPM. I'm thinking of using a TLE4905L or TLE4906L (which I think is more sensitive) - both unipolar. Now I'm a bit confused about ...
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Hall-Effect Current Sensor Output Voltage Difference (26.4 mV/A)

I am using a hall effect current sensor. Its part number is ACS781LLRTR-050B-T from Allegro MicroSystems. In my circuit, I'm reading its output voltage to calculate current with MCU. With no load, I ...
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How to detect a magnetic field from a distance?

I want to detect a magnetic field, like those of small neodymium magnets, from at least 6 inches away (the further the better, I'd like at least a foot but I won't ask for too much). I'd like to do ...
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Methods to detect metal buildup on a magnet?

So far I have been exploring Hall-effect sensors and basic metal detection. The application for my required need has limited space, needs to be small enough to fit in a palm and the simpler the ...
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Determine speed or time to reach, using ratiometric hall sensor?

Below is the setup, it consists of a ratiometric hall sensor (SS490 honeywell) i.e similar to a linear sensor, and a magnet (south pole facing sensor). The initial distance that they are separated is ...
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Magnetic field sensor for oscilloscope

I want to measure magnetic fields with my oscilloscope, so I need a magnetic field sensor / probe. My oscilloscope does a FFT for 50Hz to 2MHz. The sensor should be 3D, because I don't care for ...
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Accuracy in BLDC speed calculation

What is an accurate manner to calculate the rotational speed of a bldc motor using hall sensors and microcontroller units, considering both floating point operations and length of the observed period (...
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Identification of a threaded connector (on a speed sensor)

I'm trying to identify the mating connector for this speed sensor. The sensor in itself is a custom CNC job so no datasheet available... It's got three pins and 5 "grooves". The exterior thread is a ...
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Make shed light come on, if dark outside and door is open (with NPN and hall-effect sensor) [closed]

I recently purchased a new shed with a polycarb roof. At night, when I enter the shed, I'd like a light that comes on (but not during the day!). I'm trying to find a way for the light to switch on, ...
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How to calculate RPM from a square wave signal Voltage-Time graph

I'm struggling to understand how to show the relationship between the input and output of a hall effect sensor used as a wheel speed sensor through mathematical expression. How can I calculate the RPM ...
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Hall effect sensor model in LTSpice

I am working on hall effect based current meter and I run into some troubles running my simulation in LTspice. To be precise I am no sure how to accurately model hall effect sensor. In less accurate ...
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Where to place hall sensors (BLDC motor)?

I have a BLDC hub motor (out runner type; 3 phase wires) for my electric bike. It currently has 1 set of hall sensors (3 pieces) and I would like to install a second set (3 more) for spare (in case ...

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