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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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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
37 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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Using analog hall effect sensor with a non-inverting schmitt trigger

I have an analog hall effect sensor (i.e. UGN3503UA) that I want to convert to digital by using a non-inverting schmitt trigger. The issue I am facing is that when I connect the output of the hall ...
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1answer
95 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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1answer
55 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/-1.6 mT). Prior to going down a rabbit hole of magnetism in physics, I ...
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1answer
34 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
63 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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31 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
74 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
109 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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13 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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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
92 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
27 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
251 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
172 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
112 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
72 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
633 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
87 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
194 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
145 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
141 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
89 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
228 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
75 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
140 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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58 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
256 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
451 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
74 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
471 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
240 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
259 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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29 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
267 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
269 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
95 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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1answer
885 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
287 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
362 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
468 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
391 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?
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1answer
2k views

How to wire up camshaft position sensor in lab environment?

I have taken out this camshaft position sensor out of my Chevrolet Aveo 2007 and I am trying to verify whether the issue I am facing is with the sensor or the ECU/computer (the car cranks, but does ...
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1answer
73 views

Measuring Low Magnetic fields

Im working on a project where I want to measure low magnetic fields in a wire. The range I want to measure is 0.1 - 10 mG or 0.01 - 1 µT in low frequencies (DC - 500Hz) (This range (0.1 - 10 mG) can ...
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58 views

Measuring DC small magnetic field

For a project I want to measure the magnetic fields that are made when there goes current through a wire. I want to do this the same way as a current probe (with a magnetic core, a hall sensor, and a ...
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1answer
118 views

Effect of switching supply on a Hall effect sensor

I have a Hall effect sensor and an electric motor, with both the sensor and the motor powered from the same supply. I'd like to use PWM on the supply to vary the speed of the motor. The sensor and ...