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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Where to place hall sensors (BLDC motor)?

I have a BLDC hub motor (out runner type; 3 phase wires) for my electric bike. It currently has 1 set of hall sensors (3 pieces) and I would like to install a second set (3 more) for spare (in case ...
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41 views

Relative positioning system using Electromagnetic field from a wire

I am quite new to electronics and I'd like to build a really small car (something like Lego scale) that follows a path given by a wire under a thin plastic layer. I researched a bit, and seems like ...
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61 views

Non-invasive Low Current Measurement

I've been tasked with non-invasively measuring a 200 mA pulse signal through a wire. The solutions that come to mind are using a current clamp or a hall effect sensor. I don't need an accurate reading,...
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What happens: n Hall effect sensors wired in parallel, < n of them is triggered?

This is almost certainly a noob-level question. I only have one Hall effect sensor to play around with so I can't test this out for myself. Say I have multiple Hall effect sensors wired like this, ...
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BLDC hall sensor angle

the hall sensor of the bldc motor will give 6 states (represents the 0 to 360 electrical cycle). But what is the exact angle of the each state (that is for 101= ? degree, 100= ? degree....) I googled ...
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Please help identifying this SOT-23 part from a vehicle sensor

What is this encircled part in the picture? It is labeled "WB2" and "62". This is a vehicle sensor.
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Non contact voltage detector vs cell phone charging

We have seen one video which warned from danger of working with mobile phone when is plugged into the charger by signals detected from one non contact voltage detector like this: So here said: My ...
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Hall Effect Shielding

The objective of the circuit below is to get the difference of the hall effect output and a 1 volt reference, then amplify it. When I first built the sensor and tested it, it worked very well. This is ...
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62 views

Detecting low currents in high current industrial environment

I would like to detect if a current flows in a 3-phase industrial environment where currents can go up to 120A. Anyway, for me is only important information current is flowing/current is not flowing. ...
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1answer
110 views

How to amplify small voltage from hall effect sensor

I have an analog hall effect sensor, and the difference I am trying to sense in mT is quite low. The voltage output goes from 1.0V (no magnet) to 1.1V (magnet) on the hall effect sensor. This was the ...
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72 views

BLDC motor drive: Requires an external push to start rotating

I am trying to drive a 23-pole pair(i.e. 46 poles) BLDC motor using an LV8139 pre-drive, the output of which is fed to drive the 3 half bridge MOSFETs. I managed to connect the correct phase sequence(...
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1answer
42 views

sensing current noninvasively using hall effect sensors

I am trying to sense if DC current increases in a wire when the load changes. I do not care about the value of the current, I only want to know if it increases (motor at idle vs motor running). I ...
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Hall IC current sensors can work for positioning measurement?

I recently posted a related question but this question seems to be requiring its own thread. There are available closed loop Hall IC current sensors which detects currents passing through conductors. ...
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113 views

Linearizing hall effect sensors outputs

I'm trying to find a robust solution to linearize four hall effect sensors outout to obtain a signal that I can use in a PID control scheme. The output data is collect via 4 ADC channels on an ...
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1answer
59 views

Hall sensor doesn't switch back when I move the magnet away

I am currently working with hall sensors and I found this difference between two sensors: The first one changes voltage when I approach and move back the magnet. The other one changes when I ...
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202 views

How to read multiple I2C sensor (MLX90393) data on ESP32? [closed]

I am using MLX90393 Triaxial Magnetometer Sensors for my project. They communicate via I2C. I am using an ESP32 and coding on Arduino IDE. I found this code on GITHUB and was able to read from ONE ...
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Does Hall flow sensor require an optocoupler when using STM32 MCU?

I'm using an STM32F103 to measure water flow through a pipe using Hall flow sensors. My power supply is 12V DC to 5V/3.3V DC. STM works with 3.3V and Hall sensors with 5V levels. I've configured the ...
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current consumption of hall sensors and AND gates?

How do we calculate the current consumption of devices like Hall sensors and CMOS gates (for example: sensors like ACS725 and AND gate like MC74VHC1G08)?
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Measurement of current with hall effect sensor

I have a setup using 3 hall effect current sensors and my goal is to measure the DC current flowing through cables. The sensors are HSTS016L. I attached a picture of the manual. The sensors have 4 ...
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ratiometric hall effect sensors outputs at high RPM

Im using an allegro A1308 linear ratiometric hall sensor to measure the rpm and angular position in a shaft rotating at 20K rpm. My magnet is a 2mm dia 1120 mT magnet placed at around 15mm from the ...
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contactless sensors (hall-effect) for joystick axes, repurposing old joystick (Cypress PSoC, USB-HID)

I've been thinking about making a project where I repurpose the mechanical parts of an old joystick (ch products), including the buttons. Such that I will drive the whole system with Cypress CY8CKIT-...
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42 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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170 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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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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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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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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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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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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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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117 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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39 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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362 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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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
277 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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175 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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397 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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157 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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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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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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206 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
374 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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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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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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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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374 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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257 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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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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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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417 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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92 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 ...