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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High resolution compass heading sensing? [closed]

I'm building a simple GOTO telescope mount, and I've built the components for sensing precisely what angle the telescope is pointed at relative to the fixed base without problem. This gives me values ...
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53 views

Non-contact DC voltage (not current) detection [closed]

There are tutorials and sample circuits for non-contact AC voltage detectors (non-contact testers), but I want to know how to make something that can do the same job for DC voltage when there is no ...
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Converting Hall-effect sensor data to encoder data

I want to design a sensored BLDC motor controller, but I have a question. How can I convert sensor data from Hall effect to encoder data? Can I convert Hall effects to encoder data correctly when I ...
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How can I measure switching power losses in a MOSFET accurately?

I am going to measure under scope the switching power losses in the MOSFETs of my micro power inverter. In any case, the handling load current doesn't exceed 1 A at 24/48 Vrms. Firstly, I've thought ...
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45 views

Connect two hall sensors to single analog pin of MCU to determine upper and lower limits

I have motor which is rotating a shaft. I can rotate it only for 200 degrees so I am planning to use hall sensors and magnets on shaft to determine upper and lover rotation limits. Catch is I don't ...
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123 views

Why do speed sensors fail so often?

The typical vehicle speed sensor (variable reluctance sensor) is a very basic device which essentially amounts to a coil of wire wrapped around a permanent magnet. Simple, yes, but very reliable? ...
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26 views

Is a hall effect sensor the same as a hall effect current transducer but with a current sense?

I mainly want to know the difference between a Hall effect DC current transducer (which is different from a regular AC transducer) and a hall effect sensor (I assume that both of those differ from a ...
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49 views

A/D Converter with Hall Effect Sensor

I am trying to produce a circuit that uses the output of a hall effect sensor and feeds it into a A/D converter. I have a couple of questions about how this process will take place. Below is a circuit ...
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Accurate readings from Hall sensor flow meter on Raspberry Pi 4 vs Arduino

I have a working project on my Arduino which tells me how much water has flowed through the sensor (http://www.swissflow.com/sf800.html). It works pretty well (give or take few ml.) The Arduino is too ...
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1answer
39 views

What type of hall effect sensor do I need?

I have this gear (image attached) that I'm putting over a metal shaft and I want to measure its rpm from 800-15,000 rpm with a tolerance of +/-10 rpm. I'm thinking I can do this using a hall effect ...
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BLDC worked, but now always in stall. Hall sensor problem?

I have a Maxon BLDC motor (with Hall sensor, no encoder), controlled using ElectroCraft driver, and Arduino UNO. The motor used to work just fine, however it stopped working and instead, it clicks and ...
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38 views

Tachometer pulses breaking down at lower speeds

I have a Noctua 4-pin PWM fan (PWM datasheet) from which I'm attempting to calculate RPM using the open collector tachometer output. I'm producing the PWM waveform using a Raspberry Pi Pico. Here's ...
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Queries about how this hall sensor is connected to the MCU

This is part of the schematics from the STSPIN32F0251 EVB that shows how the hall sensors are connected to the MCU. What purpose do the 10pF capacitors and the <...
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BLDC waterproofing for submergance

I have modified a number of brushless DC motors to make them work underwater. The motors are the type with hall effect sensors. I did the following procedure on several motors, but the results have ...
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194 views

How do skin-effect and proximity-effect behave for flat-conductor power inductors?

Here is a Digikey search showing flat-conductor power inductors. And here is a picture of three power inductors found there: In this answer, by Rohat Kılıç, towards the end of his answer he explains ...
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Bidirectional Hall current sensor signal conditioning (shift and scale sensor output voltage)

I am using a Hall current sensor in circuitry where I need to implement signal conditioning in order to improve accuracy of measurement. The Hall sensor outputs 1 volt when measuring maximum current ...
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2answers
84 views

Converting speedometer gear signal

This was a board which taken out from speedometer. At first the speedometer was cable type and the display was in digital. I'm planning to convert the cable type speed into electronic one which ...
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1answer
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Looking for an off-the-shelf package for switching a small pump based on PWM signal from Hall effect sensor [closed]

I'm an electrician trying to solve a problem at home, but I'm a little out of my depth. I'm looking for an off-the-shelf module into which I can feed a PWM signal from a Hall effect sensor, in order ...
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28 views

Ground fault measurement in low voltage DC project

I am playing around with a system to detect residual current in a 12v DC system. Considering using this sensor: https://sensing.honeywell.com/index.php?ci_id=49794 If I run the +ve from the battery ...
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2answers
62 views

Divide Hall effect sensor input

I've made a circuit which is supposed to take the output of a Hall effect sensor and divide by 5, so that I get one pulse per revolution of a motor. The motor is a Nidec FY9S40 variant. Since the ...
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1answer
69 views

Cost-effective current monitoring solution for PIC

I'm in search of a cost-effective solution for monitoring the current draw in a resistive heating element using a PIC. All of the Hall Effect sensors that I've looked into seem to output the same AC ...
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1answer
79 views

How to get analog reading from an A3144 Hall sensor?

I once had a Joy-IT KY-024 sensor board that uses the A3141 Hall sensor to output analog and digital signals. I lost that sensor and then bought the Joy-IT KY-003 because I don't need the digital ...
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115 views

Does using two Hall effect current sensors in parallel affect accuracy?

I am designing a circuit with allegro current sensor ACS770 for measuring currents up to +/- 90A. I have 2 options : use single ACS770-100B (100A Bidirectional version) use dual ACS770-50B in ...
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40 views

Is there a workaround for a Hall effect encoder out of alignment with its sensors on a small motor?

I'm working with two budget SmartArduino 9V 25mm motors on a radio control tank project. Motor-A has a problem in that the encoder wheel is situated laterally above the Hall sensors. Motor-A does not ...
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Are linear Hall Effect sensors concidered "benign" components for EMC testing?

The EU's EMC Directive lists reasons a component/product can be considered "benign" and therefore is exempt compliance testing. One of these reasons follows: Equipment containing only ...
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Hall effect sensors for BLDC CW and CW positioning

Hi I have just designed a BLDC controller and I have it running in both CW and CCW directions. I have noticed that when operating in CCW the motor is less noisy and more smoother than when operating ...
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181 views

How to convert NPN transistor to PNP transistor? [duplicate]

I am making a circuit using a 4 pin hall sensor with arduino. It turns out that the hall sensor outputs a negative voltage as output, which arduino cannot read, so I will need a PNP transistor, I don'...
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Noise at hall sensor output from motor

I have motor with build in hall sensor(sc2546). I am controlling speed with 4 mosfet bridge duty cycle modulation. Frequency is about 20 kHz. Motor is powered with separate power supply and it is ...
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1answer
112 views

Device to detect current (for cable including hot, neutral, ground)

I am trying to determine if an electrical device is on in a non-invasive way using an arduino. My understanding is that devices like current transformers and Hall sensors must enclose only the hot or ...
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148 views

How to detect when an item has passed by a sensor up to a distance of 10cm?

I'm looking for a way to detect a join in a conveyor belt up to a distance of 10 cm away from the the belt. My original idea was to stick magnetised rubber strip on the underside of the conveyor belt ...
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43 views

BLDC Motor Hall Sensor Response

I'm currently developing a BLDC controller with hall sensors, curious about where the hall sensors triggered. Are they triggered when just a commutation axis becomes or around the axis (at the sector ...
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39 views

Interrupt trigger on presence of a pwm signal

In order to detect the presence of a pwm signal using a microcontroller from an external sensor (an interrupt), say the sensor is a hall sensor rotary encoder that is used to count the number of ...
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How does a magnetic sensor measure the angular speed of a crankshaft? How does its spinning affect the magnetic flux?

I'm doing work to an electrical engineer graduation subject about the transducer. I'm studying the magnetic transducer just to understand how it works and I had a little doubt. Let's look at the image ...
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BLDC motor won't start after reversing the stator axial direction

I'm adapting a 60V BLDC e-scooter hub motor (see image below) to a custom made EV. In this specific motor, as it's designed for scooters, the wiring and the brake disc mounting are in opposite sides, ...
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Working of the Peak Torque in a BLDC

We have a BLDC motor of the following specifications , and I wanted to ask that :- If the Peak Torque lasts for about 10 seconds once activated, then after what time interval can it be activated again?...
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147 views

Hall current sensor noise

For my project, I need to measure AC current for a 220V load (a more detialed description of the initial approach and problems can be found here. I'm using an ACS724 for +/-5A; the next step will be ...
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1answer
39 views

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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1answer
73 views

Is it possible to chain Hall sensors? [closed]

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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1answer
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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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242 views

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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1answer
52 views

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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1answer
213 views

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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1answer
73 views

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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2answers
58 views

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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73 views

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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