Questions tagged [hall-effect]

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

42 questions with no upvoted or accepted answers
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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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1answer
38 views

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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1answer
199 views

BLDC motor drive: Requires an external push to start rotating

I am trying to drive a 23-pole pair(i.e. 46 poles) BLDC motor using an LV8139 pre-drive, the output of which is fed to drive the 3 half bridge MOSFETs. I managed to connect the correct phase sequence(...
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1answer
211 views

Linearizing hall effect sensors outputs

I'm trying to find a robust solution to linearize four hall effect sensors outout to obtain a signal that I can use in a PID control scheme. The output data is collect via 4 ADC channels on an ...
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2answers
264 views

Hall effect - chip identification

I'm playing with Hall effect sensors and wanted to identify this one. I got it magnified but I've never seen anything like it. Is it a code for something, or has it been removed off the surface? I ...
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1answer
37 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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0answers
21 views

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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57 views

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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34 views

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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1answer
445 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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1answer
33 views

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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25 views

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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1answer
878 views

Will it work if I place hall sensor heads facing magnets in outrunner brushless motor

Will it work if I place hall sensors facing the magnets like in the picture below? I cannot put it in between the teeth because the hall sensor is bigger than the gap.
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1answer
30 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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2answers
37 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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26 views

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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27 views

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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25 views

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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24 views

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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26 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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44 views

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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41 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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55 views

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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63 views

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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1answer
51 views

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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24 views

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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12 views

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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41 views

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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467 views

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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1answer
211 views

What happens: n Hall effect sensors wired in parallel, < n of them is triggered?

This is almost certainly a noob-level question. I only have one Hall effect sensor to play around with so I can't test this out for myself. Say I have multiple Hall effect sensors wired like this, ...
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55 views

BEMF and zero crossing point detection

I am trying to control a BLDC motor without sensors using BEMF method and zero crossing detection. I managed to detect the zero crossing point but I am not sure if it is correct. I read that the hall ...
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1answer
457 views

How can I measure AC magnetic field using linear hall effect sensor with the arduino?

I have a SS49E hall effect sensor. I want to measure magnetic field in gauss using arduino analog output. I have a code for analog application but is this appropriate just for the dc magnetic field ...
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3answers
352 views

OpAmp VS Voltage Divider VS Buck Converter (Current Sensor Output)

I'm working on part of a project and I need to build the circuit that reads the current through a phase of a motor using this IC from Allegro. Assuming there will be no more than 5A, and using a VCC=...
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76 views

Falling Marble Sensor

I'm really building a sort of Rube Goldberg machine that students will assemble in order to guide a falling ball down through a series of gates/openings, where I need to detect when they're successful ...
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43 views

Pushbutton + relay + hall sensor

I need to find a solution to start a relay with a momentary pushbutton and stop it with a hall sensor. The rellay would control ~1000W. I was thinking of two possible solutions: analog: pushbutton ...
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2answers
259 views

Convert a hall-effect flow meter to operate as on-off switch

I'd like to convert a hall-effect flow meter to operate as on-off switch. the output is in pulses, which arrive at a rate proportional to the flow rate. what I would like to do is have a circuit ...
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1answer
185 views

closed loop hall effect sensor operation

I know that closed loop hall effect sensors generate a current in the secondary winding to oppose the flux in the core such that the net flux will equal zero. At this point the current in the primary ...
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1answer
580 views

Relating Hall sensor outputs to absolute rotor position (Which combination corresponds to which angle)

I have a working 6-step BLDC commutation which works based on the Hall effect sensor outputs. I would like to apply the same code to another motor, which doesnt have Hall sensors but an absolute rotor ...
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299 views

Measuring the angle of finger joints

I'm working on a project where I want to very accurately (+/- 1 degree) determine the angle at which a finger is bent. One of my main constraints is that my sensing mechanism can't interfere (much) ...
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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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2answers
54 views

current consumption of hall sensors and AND gates?

How do we calculate the current consumption of devices like Hall sensors and CMOS gates (for example: sensors like ACS725 and AND gate like MC74VHC1G08)?