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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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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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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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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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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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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53 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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124 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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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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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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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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35 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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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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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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82 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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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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71 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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53 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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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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49 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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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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42 views

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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209 views

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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986 views

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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96 views

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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107 views

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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120 views

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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