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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What geometry of magnet is typical for end-of-shaft Hall angle sensing?
While selecting parts for shaft angle sensing, I often have difficulty selecting magnets to act as the rotating magnetic field for a Hall angle sensor.
I've ended up selecting diametrically magnetized ...
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Building a ferrous metal detector [closed]
I'm planning to build a ferrous metal proximity sensor to use as part of a robotics project. During my research, I found a very helpful youtube video (linked here) that shows how to do so for a Hall ...
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Would a Hall effect sensor be damaged by gross saturation?
There's this old question that is almost what I'm looking for, but not quite.
I want to make a current direction sensor - I don't care about magnitude - for a car starter battery. I care about the ...
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Why is there a potential difference between VCC and Output pins of A3144 hall sensor?
When we bring a magnet near the A3144 sensor the PD between output and GND goes to zero but how come does the PD between output and VCC becomes equal to the PD of VCC and GND. Also when the magnet ...
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How to multiplex open drain sensors
I have 64 digital hall effect sensors with open drain outputs (A3144), and would like to read their outputs with an MCU. Is there a simple way to multiplex these sensors to limit the number of IOs ...
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BLDC hall sensor output to pulses
I want to combine the output of the three phases of the hall sensor output to generate a pulse for any change in the output of the hall sensor. Can someone suggest a circuit implementation to achieve ...
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Basic bench wiring of an A3144E hall sensor
I'm trying to build a tachometer using a hall effect sensor which will later be an input for an Arduino. At this stage I'm still just bench testing the sensor. I bought the sensor on ebay, the listing ...
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Hall effect sensor PWM matrix
Is it possible to set up a PWM output hall effect sensor in a matrix to reduce the number of GPIO pins required? I'm guessing not because there would always be a signal from the others in the row/...
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I want to make use of an Allegro A1324LUA-T Hall sensor to sense a very small magnetic field change. Would it be possible?
I am looking into using an Allegro A1324LUA-T for sensing very small magnetic field changes.
The data sheet shows that the sensor gives a 5mV/G change in voltage so I can sense a 0.1 Gauss change if I ...
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Can I use a hall sensor ammeter to measure current in several DC wires simultaneously?
I would like to embed something like this into my LED application and measure the total current supplied (ideally I'd want to display watts but can't find such a device).
The problem is my power ...
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Is it possible to use RF signal wires to let a model car center itself on it using phase differences?
I'm looking for a way to let a model car (1/24 to 1/18) know how centered it is on a road. I thought about using a buried wire in the middle of each lane of the road. Would it be possible to detect ...
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Water flow sensor stays on until tapped [closed]
I'm using a hall effect rotor sensor to control power to a UV purifier connected to the outflow from a reverse osmosis undersink tank system, connected to the inflow of the UV purifier chamber.
(https:...
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Hall sensor or encoder
I have an Ashwoods 1008-269 motor, and I'm having some trouble actually finding a proper datasheet for it. Does anyone know whether it uses encoder or hall sensor, and the pin layout of the output ...
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Why does a Hall sensor use a solid magnet?
I have disassembled two motor circuits that use a Hall sensor. One is a cooling fan blower and the other is a 230 VAC motor.
The blower has a brushless motor and has its Hall sensor on the stator ...
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Hall effect placement on axial flux BLDC motor
recently i was given a project regarding flywheel energy storage. One of the main component of my project is a axial flux BLDC. I have been searching around and i couldnt find a good source regarding ...
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Noisy output of Hall current sensor
I am designing a buck converter with a switching frequency of 200 kHz. I measure the current using a Hall-sensor, the ACS730KLCTR-20AB.
The implementation is the following:
I think the routing is ...
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Measure number of rotations of DC motor using Hall encoder
I bought this motor on aliexpress which comes with Hall encoder on (I bought the 12 V 1930 rpm version), and they said on the website:
It is 11CPR for resolution for Hall encoder (this type is hall
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Recommeneded method to monitor rotary position and speed of machinery shaft
I am building a piece of industrial machinery that will operate between 10-200 RPM. I would like to know the rotational position and speed of the shaft (2in diameter steel crankshaft). I am currently ...
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Making an automated chessboard [duplicate]
I want to create an automated chessboard. At the moment, I'm making the project and deciding what technology to use to detect which piece is at what position and how to move them. I'm not so skilled ...
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Hall sensor signal error caused speed measurement errors in BLDC motor
The three Hall-effect sensors used for BLDC motor speed control are supposed to generate an edge every 60 electrical degrees. however, due to magnet charging problem, or mechanical alignment problem, ...
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Why does the ESP32 have a built-in Hall sensor? [closed]
The ESP32 has a built-in Hall-effect sensor. I am wondering if there is some sort of reason behind this other than "it was a nice addition".
A lot of sites talk simply about using it, and ...
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Can magnetic levitation kits be stacked?
Hall-effect magnetic levitation kits are available (cheaply) and require manual assembly. You put electromagnets in the center and you have some board which controls the stability via a Hall sensor. ...
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Read output from Hall-effect sensor VF460S using microcontroller
I have got a few Hall-effect sensors, the VF460S from Honeywell.
Now I try to make a circuit using a microcontroller Raspberry Pi Pico to read the output. I have connected V-supply pin to 3v3 gpio, ...
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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-...
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Why do Hall sensors saturate?
Can anyone explain to me what happens when a Hall sensor saturates (see graph underneath)? What is the physical cause? What happens to the electrons in the current to cause saturation? I can't find ...
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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 ...
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Current sensor for sensing 6 mA DC & 30 mA AC current [closed]
I want to sense very low currents for both AC & DC for an EV charger application. General AC & DC sensors do not have that much range to sense the current. Please suggest some good component ...
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What is the location of the Hall effect sensor in a BLDC motor?
How can I calculate the location of Hall effect sensors for a BLDC motor according to the number of stator slots and the number of rotor poles?
What mathematical relationship is there to calculate?
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Why can't a Hall-effect sensor be used to detect or receive a radio signal?
The electromagnetic wave is said to be a combination of an oscillating magnetic and electric field, so why can't we use a Hall-effect sensor to detect a radio wave?
Some references say that the HF ...
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Hall-effect sensor joystick problem
I'm trying to control a 3-axis stepper motor motion system using a 3-axis Hall-effect sensor joystick (the APEM HF Series joystick, to be specific).
My problem is that whenever I move the joystick in ...
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Digital Hall sensor only connects to ground when active
I want to make a power control circuit that turns off when a digital hall sensor detects a magnet.
All digital hall sensors I have found connect to ground when active. I was thinking about using a ...
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The delay between motor BEMF and Hall effect sensor output
I have a BLDC motor with Hall effect sensor feedback. The Hall sensors are located in the center of every tooth of the motor (Figure 1) based on mechanical and electrical degree calculation.
I have ...
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Op-amp amplifier for Hall sensor: grounding
I built a simple LM741 non-inverting amplifier with a fixed gain of 3.1x and verified it works for a simple +0.3 VDC input on pin 3. It uses a dual power supply consisting of two 9V batteries in ...
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Adapting Hall sensor output to NodeMCU ADC input
I thought this would be a simple problem with lots of answers but alas, here I am :-)
I have a throttle pedal with a Hall sensor (3 wires) that I want to connect to an ESP8266 (Node MCU) ...
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How to measure power consumption of a lot of circuits?
Our house has a lot of electrical circuits/breakers and I have thought about how nice it would be to be able to monitor current consumption for each of them in parallel. Of course one can buy meters ...
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Hall-effect sensor from old vehicle
I have an old bus with some electrical problems that I am trying to solve.
One problem is the dashboard. For many years, the dashboard was leaking rain water because of a broken windshield. The ...
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Is it possible to measure the Hall effect with a simple home experiment?
I came across a YT video where allegedly the Hall effect is measured.
No matter how I tried, I couldn't reproduce it. I used a lab power supply, applied up to 10 amperes of current. The voltmeter does ...
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Hall-effect sensor datasheet/setup questions
I have a few HO 6-P/SP33 Hall-effect sensors and I've been reading through the datasheet, but I can't figure out how I'm supposed to use them.
I have several questions about the information in the ...
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When is the right time to turn on phase wires A, B and C in a sensored BLDC motor to make it rotate?
I just bought a sensored bldc motor and I built an esc for it. Here is the schematic
When I power everything on I can hear the motor trying to turn, but it keeps getting stuck and it won't budge. I am ...
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Maintaining constant magnetic field strength with temperature
We use SmCo magnets to create a field strength of around 300mT. We choose this material, rather than NdFeB because the former has a much smaller change in field with temperature. For SmCo it is (...
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BLDC motor sensors are reading High while no current is flowing through motor
I am trying to get a sensored bldc motor to spin by building my own ESC. I have the complete circuit built and working perfectly, but i'm having trouble with the sensors.
Recently something weird has ...
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How much current is needed for a hall sensor to detect a HIGH signal?
I am trying to get a sensored bldc motor to spin by building my own ESC (electric speed controller).
I have built a circuit that works perfectly the way I want it to using 3 H bridges, but the problem ...
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How do you know which pin corresponds Hall sensor 1, 2, and 3 so that I can pair it with the correct phase wire in a BLDC motor?
I recently bought a brushless sensored DC motor on Amazon which you can find here.
I didn't really know what I was doing at the time when I bought this motor, but now I'm realizing it might have been ...
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Implementing A/D conversion circuit to a DIY clamp meter
I was looking for cheap clamp meter projects and found this one: DC non invasive current clamp for oscilloscope DIY.
After reading about this project, I noticed that it had a BNC output to read values ...
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AC current detection with 1-10mA sensitivity
I need to build a current switch that will be connected to an Arduino (or Raspberry Pi) digital input. I need it to set to HIGH (3.3 V) if the current is above some threshold, and LOW otherwise. The ...
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Detecting magnets regardless of polarity
I'd like to build large matrix of sensors to detect objects placed on it. I can place magnet or metal inside detected pieces. I tried to use reed switch and hall sensors. Hall sensors seems like ...
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Single Phase Hall Effect Fan Driver - how to use this part?
During the search for some sensor, I stumbled over the following part (MA477M) and I was wondering how exactly it would be used.
It is called "Single Phase Hall Effect Fan Driver".
How would ...
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16 Hall-Effect Linear Sensors to Analog Muxer to an Op amp scaler to ADC
I am planning out a midi controller because not enough of those exist.
Down to my inexperience please point out some gotcha I may be missing.
The short version of what I am doing.
Basically 16 hall ...
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Converting Hall-effect sensor data to encoder data
I want to design a sensored BLDC motor controller, but I have a question.
How can I convert sensor data from Hall effect to encoder data?
Can I convert Hall effects to encoder data correctly when I ...
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How can I measure switching power losses in a MOSFET accurately?
I am going to measure under scope the switching power losses in the MOSFETs of my micro power inverter. In any case, the handling load current doesn't exceed 1 A at 24/48 Vrms.
Firstly, I've thought ...
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