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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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21 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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2answers
41 views

Need help with a pulse/counter input circuit on hall effect flow sensor

I am having trouble wiring up a flow sensor to my pulse/encoder/counter card. I am using a hall effect flow sensor that works fine when wired to a digital counter display. However, when I try to ...
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1answer
24 views

Hall Effect Sensor Wiring for Crankshaft Position Sensor

Please forgive my ignorance in my description. I have looked around and been unable to find what the following symbols mean: on wire number 51 there is a black filled circle with a dashed circle ...
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30 views

How to stabilize the magnetic levitation system? [duplicate]

I have asked similar question before also but want to try again - Not able to levitate magnet for magnetic levitation project I followed everything from this project but still, the magnet is not ...
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1answer
110 views

Not able to levitate magnet for magnetic levitation project

I am following a hackster project on magnetic levitation here - https://www.hackster.io/jsirgado/magnet-levitation-with-arduino-eeeee4 However, I have followed everything but still, it's not working. ...
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29 views

solar tracker slew drive end stop

I am designing a solar tracker and using a slew drive to rotate the panels from from east to west every day. Now, I would like to install a sensor that can be used to determine and calibrate the ...
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2answers
38 views

Hall sensor graph

Anyone can help me to interpret the Supply Voltage vs Temperature from this datasheet ? What does it mean ? Why the supply voltage modifies ?
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1answer
419 views

ESP32 using acs712 give wrong values

I'm trying to measure current with acs712 30A current sensor connecting to NodeMCU-32S but I'm getting wrong and unstable values. For zero current the ADC pin should read value of 2048 (esp has 12 bit ...
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2answers
77 views

How can I test a Hall effect sensor at a given distance?

I have a project that includes an Ablic S-5716ACDL1 omnipolar Hall effect switch. It has a sensing range of about 3 mT (±1.6 mT). Prior to going down a rabbit hole of magnetism in physics, I ...
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1answer
37 views

Boosting the Analogue Response of a Sensor

I have a A1308KUATN-9-T Hall Effect sensor with the following sensitivity (from the data sheet): As you can see, the sensitivity comes to about 9mV per Gauss on average. My calculations (see below ...
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1answer
144 views

3 phase Bldc hall sensor problem

I am trying to drive a 350 watt, 3 phase, BLDC motor (DGW07-20j model) with stm32 micro controller. But I have problem with hall sensors because their outputs are not similar to the hall sensors which ...
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58 views

BLDC hall sensor output problem

The Hall sensor output is weird. First, I use 5V power supply connected to the Hall sensor power cable. Then, the outputs give me three high levels. Whatever how I rotate the motor, the output does ...
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1answer
104 views

How does a Hall-based wattmeter work?

I read about the Hall effect and understand its usage in sensors like speedometers, but I also read it can be used as a wattmeter. How can it happen? In order to calculate power (P) we need to ...
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3answers
123 views

Microcontroller overheating when sensor is plugged in [closed]

I am building a board based around an STM32L051C6 microcontroller, which will measure a hall effect sensor (AH3362Q) and count the time in between the edges the sensor sees. The sensor is powered from ...
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54 views

Measuring rotation time

I have encountered a problem regarding my project. I have to make an POV(persistence of vision) display and in order to do that I have to measure rotation time.I tried to turn a led on at each half ...
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0answers
16 views

Identify this: 2D/3D hall sensor BCVJ 397

I have this IC, which is a 2D (maybe 3D) hall sensor in a QFN16 package. It is labeled BCVJ 397 and has no manufacturer marking. Any idea which IC this is?
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2answers
139 views

Hall effect sensor as 2 wires switch

I need to find a way to make an on/off proximity detector triggered by a magnetic field, fitting in a small space of about 5mm ^ 3, and connected to the board by only 2 wires. I know a could use a ...
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1answer
120 views

dc motor, hall sensor 10-20VDC to arduino

I have a linear actuator with a brushed DC motor with 2 hall sensors. I intent to use the sensors to monitor the position of the actuator. The specifications of the hall sensors are as follows: Hall ...
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1answer
28 views

Evaluating Hall Effect Sensor - Practical Explanation of Bops / Brps?

I am trying to choose between two types of hall effect diodes with internal pull-up resistors. What is the practical explanation when comparing the Bop and Brp of the types (red square): - AH3781 ...
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2answers
483 views

How does a hall effect wheel speed sensor work?

I have been researching how a wheel or crank speed sensor works in vehicles and am having a hard time finding a hard truth. I think I understand how it works simply. That the sensor detects a change ...
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1answer
174 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
150 views

Pull-up scheme for Hall effect sensors on a BLDC

I looked around on here, and used google, and couldn't find a direct answer to this question. Please forgive me if I overlooked something. I am working on a board to control a BLDC motor (BLWS231D-...
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3answers
82 views

Using latching Hall sensor to toggle a LED - brightness issue

I'm using a U18 latching Hall sensor (datasheet) to toggle a LED. I'm driving it off a 6V L1016 battery. My issue is that the LED is very dim. My understanding is that the U18 limits the output ...
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1answer
641 views

Making a Hall effect sensor into a PCB

This question is related to Is it possible to “trace” a hall effect sensor on a PCB?. As far as I understand it, a Hall effect sensor consists of a metal plate, plus a current source and an amplifier....
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2answers
90 views

High accuracy angle sensor

What's an appropriate sensor for cheaply and accurately measuring an angle of rotation? I'm trying to measure the angle of a joint in a robotic limb using a small potentiometer mounted at the axis of ...
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1answer
242 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
160 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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2answers
145 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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2answers
94 views

Measuring pendulum dynamics with magnetic field sensor

I've been working on this project which measures pendulum position and motion. Currently I use a 9-DOF inertial measure unit (IMU), like that used in this project/question. The method works very well, ...
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1answer
273 views

How to calibrate ACS770 upon device startup

I am using the Allegro ACS770 100A Unidirectional current sensor (datasheet). To measure the output from this sensor I am using the TI ADS1115 (datasheet). The ACS770 is supposed to output a 0.5V ...
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1answer
79 views

Can Static Electricity change the voltage reference of a PCB?

Problem: After running a test that creates static electricity, the values acquired by a hall-effect sensor are not correct anymore. Context: The device I am working on draws and rolls up fishing ...
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1answer
207 views

When to use a Hall probe and when a fluxgate magnetometer to measure magnetic fields?

I am familiar with how the two methods work, but what applications are more suitable for one rather than the other? I have seen this question but I don't think it covers my point.
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6answers
2k views

How to detect when DC motor stalls so that it can be turned off?

When a DC motor gets stuck and can't spin anymore, its current usage increases. What I want to do is to detect that current increase and turn off the motor. My motor current is 180 mA. Is there any ...
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62 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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2answers
68 views

Unable to detect Hall Effect

I have watched several videos on the Hall Effect, but when I try to create the effect in my garage I get zero results. As you can see in the attached photo I have a volt meter connected across a metal ...
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2answers
307 views

Latching Hall effect sensor not working

I wired up a latching hall effect sensor to an LED. My power source is a stack of three 1.5v coin cell batteries. Sensor was working just last night and then all of a sudden I tried it again this ...
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1answer
508 views

Hall Effect Flow sensor output characteristic [closed]

The cheap and convenient hall effect liquid flow sensors available for a few bucks online nearly all cite the device output as being a square pulse train whose frequency is a linear function of the ...
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1answer
89 views

magnetic hall effect sensor

I'm currently working on building a density based traffic light model. I want to use the magnetic hall effect sensor to detect the number of the cars passing, so the idea that I have is to place the ...
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2answers
560 views

How to increase hall sensor voltage

I apologize but I know jack about this stuff and this is probably a simple question I can’t seem to figure out. I have 12 volt power supply, a 3 wire unipolar Honeywell SRC3-A1 4.5-24 volt hall ...
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1answer
274 views

Realistic Magnetometer Specifications [closed]

I'm working on making improvements to an old project I helped design. The project used an Arduino to take measurements from six sensors to measure the strength of a nearby electromagnet that generated ...
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2answers
305 views

Regulating square wave signals of varying amplitude

I'm looking to capture the output of some Hall Effect sensors on a microcontroller/SBC, operating at a logic level of 3V3. The Hall Effect sensor voltage range could be 0-5V, 0-9V or 0-12V. What is ...
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32 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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3answers
282 views

Monitor tiny variation in voltage

I should apologize if my question is trivial since I did not find a similar question, I decided to specifically ask mine. I have a microscopic membrane in my lab, this piece which we call it NMS has ...
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1answer
311 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
97 views

Is it possible to tap a wire without breaking it?

There are plenty of ways to connect to a wire and measure what is going through it that involve breaking the insulation around the wire (such as positap connectors). It is my understanding that a ...
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2answers
991 views

Current Monitoring - CT vs Hall Effect vs Rogowski Coil?

I am trying to determine the best option for monitoring the current in a specific application but am having difficulties deciding between a current transformer, Rogowski coil or Hall effect sensor. ...
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1answer
340 views

Hall Effect Sensor for Current Sensing in High DC Voltage

I am designing a system to sense current and voltage of a 54V, 8AH Battery. I managed to design the voltage sensor, by using a voltage divider. As for the current sensing, i will be using the Hall ...
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1answer
383 views

Reading output from “line-driver” hall-effect sensor

I am trying to control a 3 phase brushless dc motor with integrated hall-effect sensors. I understand how to do this with your typical open-collector hall effects, however according to the ...
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3answers
489 views

A simple way to detect an AC 3 phase induction motor ON/OFF state

Background: There is a 3 phase motor running by an inverter. motor specification is about 1.8KW power and 230/400V and 1.13A. I want to drive another DC motor synchronized with that AC motor so the ...
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2answers
450 views

Can I overlap magnet wire when wrapping a toroid or must it progress linearly around the circumference?

I've been playing with inducing magnetic fields in a ferrite toroid with turns of magnet wire. Can you overlap, e.g. double back over the previous turns so I don't need a larger toroid?