# Questions tagged [hall-effect]

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

339 questions
Filter by
Sorted by
Tagged with
29 views

### Measurement bias of Hall sensors with moving permanent magnets

I want to measure the magnetic flux density produced by a moving permanent magnet. In my case, the magnet would move left and right alternatively at speed of 10 mm/s, with a constant vertical distance ...
• 1
37 views

### Closed loop Hall current sensor, is it possible to shift the result from negative output?

I am planning to use this closed loop Hall current sensor. Is it possible to use a unipolar power supply (ie. only +24V, no negative) and shift the result by not connecting RM to ground, but to a ...
• 583
88 views

### BLDC six step commutation table confusion

What is the reason why there are many different six step commutation tables on the internet? No1 table No2 table Table reference: "https://lucidar.me/en/actuators/commutation-for-bldc-motors/&...
• 27
37 views

### How do I get sheet resistance from my hall sensor model? Do I just put in that formula? If so, how do I put 'ln' and 'pi' in?

How can I achieve sheet resistance in my hall sensor model? How do I input that formula in to get that output graph? Any feedback helps, thank you. I am referencing from this paper. https://www.mdpi....
• 21
1 vote
100 views

### Allegro current sensors on 220 VAC mains

A friend is designing a power meter for 220 VAC mains and is considering Allegro current sensors like the ACS37002 or ACS71240. Those sensors put a wire with a sub-ohm resistance in line with the ...
• 113
85 views

### Simulate hall voltage as a function of temperature in LTspice

I'm trying to simulate how temperature affects voltage sensitivity in my hall sensor from LTspice. How do I make use of this equation to get my correct output? Any feedback will help, thank you. I ...
• 21
216 views

### Deflection of current in a metal plate conductor

If I have a metal plate (square in shape) and an electric current moves from one side to the other. I understand that most of the current will take the path of least resistance but all paths will be ...
• 31
70 views

### BLDC motor with hall effect sensor

I have BLDC motor. I just powered up the hall effect sensors by connecting 5 V to my STM32 dev board and also connected the ground pin. Then I checked the voltage on output pins while rotating the ...
600 views

### Need help in identifying- analog Hall sensor with the numbers 958409 (Added: Actually 95B)

I have found the following analog Hall sensor on some old BLDC motors I salvaged. I'm hoping to replace them with digital ones, but I am unable to find any specs on the current ones. A picture of a ...
• 195
472 views

### How do Hall-effect sensors work in multi-pole BLDC motors?

I'm somewhat confused on how Hall-effect sensing works for multi-pole BLDC motors. The Hall-effects sensors I have seen, for example in the image, often are in an arc and not evenly distributed. I was ...
• 720
1 vote
38 views

### Transmission of the signal from the Hall sensor to the PLC

I would need help with my application for counting impulses sent from a Hall sensor. Below is the description of the application. In the project, I have a 2-pin Hall sensor powered by +13VDC. ...
77 views

### Two Hall signals to one ADC and pull pin to ground

I have a two-way thumb gas control which outputs two Hall-effect signals, each between 0.7 V and 4.0 V. I want to connect it to one ADC pin to control a motor. Normally I run it with one Hall-effect ...
• 1
79 views

### Can anyone identify this surface-mount sensor?

The picture shows a part of a brushless motor. The sensor looks like it may be a Hall-effect sensor, but I'm not sure. Can anyone help me identify it?
• 173
308 views

### Hall-effect sensor PWM jitter from switching converter

I am designing a circuit to power two magnetic sensors using a Li-po battery (nominal voltage = 3.7 V), DC-DC boost converter, and then either an LDO linear regulator or a buck converter to generate a ...
• 61
1 vote
56 views

### Arduino Nano 33 IoT: PWM read jitter

I am trying to read two 2 kHz (500 μs period) PWM waves (from two Hall-effect sensors) at two digital pins of an Arduino Nano 33 IoT simultaneously with on-duty ranging from roughly 30 to 70%. One ...
• 61
1 vote
67 views

### Should I maintain any minimum distance between two hall encoders of two motors?

I am a beginner and am trying to build an autonomous mobile robot. I want to use two DC motors with Hall-effect encoders. The image shows the position of the two DC motors. Do I need to maintain any ...
• 53
1 vote
74 views

### STM32F411E-DISCO BLDC Hall sensor

With an STM32F411E-DISCO, I am trying to obtain the RPM value by receiving data from the Hall sensor of a BLDC motor. For this, I activated XOR On / Hall effect mode and connected the pins of the Hall ...
86 views

### Transistor Selection for Hall Effect Sensor Circuit

I would like to strobe an LED strip at about 16 Hz using an A3144 Hall effect sensor. The strip will draw about 300 mA, but the sensor output is only rated for 25 mA. My plan is to switch the power to ...
134 views

### NODE MCU/ESP8266 interrupts issue

I am using esp8266 to calculate the rpm using hall 3144 sensor, and while doing so there is an issue arises in code. ...
• 1
52 views

### System wide noise on high power BLDC controller prototype

I'm designing a highish power BLDC motor diver (120A continuous 48V nominal 90V max) BLDC controller and am having noise issues caused by the mosfet switching. Basically at the high and low ...
52 views

### Why am I seeing deadbands in the output from TMAG5273 (Angular hall sensor)?

I'm testing a TMAG5273 for use in a game controller product, using it as an angle sensor. The IC is in a roughly on-axis configuration with some small amount of offset from true center, but the IC ...
• 163
46 views

### How can I read a high frequency PWM falling edge with Arduino interrupts?

My project is about a Magnetic Levitator. I control the electromagnet with a high frequency PWM signal which I use on the MOSFET gate to give to it enough current. The thing is that I use a linear ...
• 11
1 vote
227 views

### Undesired oscillation in an electromagnet control system causes the levitating object to fall

I have been struggling with a college project, being so close but yet so far from making it work succesfully. I have designed an electromagnet control system that has to control the position of an ...
• 11
34 views

### 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 ...
• 163
70 views

### 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 ...
273 views

### 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 ...
• 5,676
36 views

### 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 ...
1 vote
91 views

### 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 ...
157 views

### 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 ...
• 265
1 vote
135 views

### 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/...
• 13
76 views

### 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 ...
1 vote
215 views

### 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 ...
• 43
1 vote
51 views

### 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 ...
• 11
59 views

### 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:...
508 views

### 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 ...
• 173
116 views

### 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 ...
• 169
38 views

### 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 ...
• 143
56 views

### 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 ...
• 463
62 views

### 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 ...
• 43
146 views

### 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, ...
• 383
671 views

### 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 ...
• 125
85 views

### 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. ...
80 views

### 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, ...
• 237
2k views

### 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-...
• 1,424
1 vote
337 views

### 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 ...
• 111
1k views

### 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 ...
• 343
64 views

### 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 ...
1 vote
2k views

### 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?
1 vote
265 views

### 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 ...
• 111
1 vote