Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [hall-effect]

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

The Hall effect is the production of a voltage difference (the Hall voltage) across an electrical conductor, transverse to an electric current in the conductor and a magnetic field perpendicular to the current. It was discovered by Edwin Hall in 1879. The Hall coefficient is defined as the ratio of the induced electric field to the product of the current density and the applied magnetic field. It is a characteristic of the material from which the conductor is made, since its value depends on the type, number, and properties of the charge carriers that constitute the current.

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What are the advantages of a shunt resistor vs. a hall effect sensor?

I'm constructing a boost converter, and I need to measure both the input current and the output current. Currents range anywhere from 25A to 200A, depending on the model. My controller is referenced to the negative rail of the converter. I've been…
Stephen Collings
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Why don't hall effect current sensors exist for low currents?

There do not seem to be hall effect current senors available for small currents, say on the order of 500mA. I'm guessing this is due to some technical or physical limitation. What is it?
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How do I measure the RPM of a wheel?

I'm trying to make an onboard system for my bike using an Arduino or maybe the Lilypad boards. I think I should use a Hall effect sensor, but any alternative is good as well. I want to output my speed to an LCD display and I'm wondering the best way…
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How can I detect my vehicle's shifter position? Will a Hall Effect Sensor work?

I drive all Manual Transmission vehicles, and after a long battle of wills with my girlfriend, she has conceded that she would learn if there was a display that showed what gear was selected, thinking this might deter me. To her future dismay, I…
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Is it possible to "trace" a hall effect sensor on a PCB?

To my knowledge, a hall effect sensor is just a soft-cored hooped metal (iron?) with some wire wrapped around it a precise number of turns. This surrounds another wire that you wish to measure the intensity of passing current. The coil has a…
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High-bandwidth current measurement

We need to measure +-50Amps of current (PWM) on a PCB. We need the measurement to be isolated, so I thought of using an ACS758, and feeding its output to an ADC. However, this hall effect sensor is "limited" to 120Khz bandwidth and in our…
SomethingBetter
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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. Instead of buying a Hall effect sensing chip,…
Rocketmagnet
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Reduce noise from a Hall effect sensor

I am currently working on a magnetic levitation project using a Hall effect sensor for distance measurement. I drive the coil using two 12 V car batteries in series to form a 24 V DC source, a MOSFET and a 3900 Hz PWM signal from my Arduino. Here is…
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Is the Holzer effect the same as the Hall effect? (looking for replacement sensor)

I was looking for a replacement component for what I thought would be a "Hall effect sensor" (used in an electric scooter throttle handlebar). I had bought a replacement throttle about a month ago, but now it's dead again so I dismantled one of them…
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Why don't we use Hall-effect current sensors in DC motor drivers and power supplies?

All sensing and control applications use shunt-based current sensing which is prone to resistive loss, amplification noise, and high-side, low-side polarity limitations. Why can't we just use Hall-effect ICs which seem easier to use?
M lab
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Sampled 100 Hz sinusoidal signal from Hall sensor shows 10 Hz sidelobes when sampled at 500 Hz

I am working on a project where I need to measure an oscillating magnetic field that oscillates at a frequency of 100 Hz. For this reason, I am using a Hall sensor. I programmed the Hall sensor to operate in "500 Hz continuous measurement node" and…
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Sensing magnetic pulses from a rowing boat impeller

I'm a mechanical engineer at uni who has some basic experience in electronics and programming. I'm building a system for my rowing boat to help me with my training. This will give me feedback on a variety of things like speed and rudder position.…
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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 way to use Hall effect sensors for that? Do I…
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Old Hall-Effect Keyswitches?

I have a keyboard from an old Silent 700 TTY that I'm trying to bring to life. The problem is that each individual keyswitch appears to be a hall effect sensor. There are no part numbers; the chip dies are individually bonded to the carrier…
phooky
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What exactly is the purpose of a Hall sensor in a BLDC?

I was reading an articles about brushless DC motor, used in CPU fans, from this link. First I thought that the Hall sensors are used only for measuring the speed, but that is not correct, it has something to do with the current flow in the coils.…
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