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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40 views

Hall effect sensor through plastic

I was wondering about the viability of adding a Hall effect sensor which can sense a magnet through a plastic cover. I'm interested measuring the angular velocity of a motor through a plastic cover, ...
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Replacing potentiometer with a hall sensor in PWM DC motor control module

I have a DC Motor Speed Controller (PWM) that uses 100KΩ potentiometer to adjust motor speed. And I also have an electronic throttle pedal that used 49E Hall-Effect sensor (+5V, 0.8-4.2V signal, 1KΩ). ...
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73 views

Capacitive Switch To Distinguish Between Metal and Plastic

I have an application where a rotating plastic wheel has ferromagnetic inserts on the circumference of the plastic wheel (they don't stick out). Shown below in the picture is the plastic wheel (black)...
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38 views

Replace magnetic sensor - help identify 3-pin IC marked “W10” and “1095”

We have an instant gas hot water system that is not initiating. I've traced it to the water flow sensor not signalling when water is flowing. After inspecting the housing, the magnet is spinning ...
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Can these small Hall-Effect Current Sensor Modules really handle 30A?

These don't look like the could reliably handle 30A to me. The terminal block is small, the chip is tiny. Please help me understand what the considerations are when sizing components & traces for ...
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29 views

Brushless DC motor - number of hall sensors

When we have hall sensors inside a BLDC to use as encoders for the processor, I saw some diagrams on web showing 3 output signals (open collector outputs, need external pull-ups to the VCC of ...
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1answer
28 views

Are hall effect sensors ratiometric?

I am working on the Arduino magnetic levitation project and it requires "ratiometric" hall effect sensors. On amazon and adafruit there are no hall effect sensors that are explicitly "...
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24 views

Best way to select a hall-effect sensor and a magnet that work well together

What is the best way to select a hall-effect sensor and a magnet that will work well based on the constraints of a specific project? Say, I want the sensor to detect a relatively small magnet ...
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Hall effect current transducer schematic diagram

What is the function of the amplifier 2 in the below circuit diagram? HCT-0016 Hall Effect Split-Core Current Transducer: https://www.magnelab.com/products/hall-effect-split-core-current-transducer-...
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78 views

How to detect when an LED has burned out?

I'd like to have a way to detect when a low power LED burns out (2-3.5v, 200-400mA) that is being driven using PWM from a Raspberry Pi with a MOSFET. My understanding is that I would be able to ...
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3answers
123 views

Non inverted OpAmp & Shunt circuit not working

I am trying to measure the output from a Hall effect sensor (LEM-LF 310-S) for a welding application. The maximum output of the sensor is 0-0.25A when sensing 0-500A. This range I need to convert to ...
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How to wire this linear Hall effect sensor

I want to measure alternating magnetic fields 50 Hz to 100kHz. I have the Honeywell SS 495 A linear Hall effect sensor and have used it like in the circuit diagram: . I could successfully measure a ...
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Hall sensor confusion with unipolar and bipolar as well as magnetic induction sensitivity

I want to create a simple bicycle computer that shows my speed and RPM. I'm thinking of using a TLE4905L or TLE4906L (which I think is more sensitive) - both unipolar. Now I'm a bit confused about ...
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Hall-Effect Current Sensor Output Voltage Difference (26.4 mV/A)

I am using a hall effect current sensor. Its part number is ACS781LLRTR-050B-T from Allegro MicroSystems. In my circuit, I'm reading its output voltage to calculate current with MCU. With no load, I ...
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37 views

How to detect a magnetic field from a distance?

I want to detect a magnetic field, like those of small neodymium magnets, from at least 6 inches away (the further the better, I'd like at least a foot but I won't ask for too much). I'd like to do ...
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Methods to detect metal buildup on a magnet?

So far I have been exploring Hall-effect sensors and basic metal detection. The application for my required need has limited space, needs to be small enough to fit in a palm and the simpler the ...
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Determine speed or time to reach, using ratiometric hall sensor?

Below is the setup, it consists of a ratiometric hall sensor (SS490 honeywell) i.e similar to a linear sensor, and a magnet (south pole facing sensor). The initial distance that they are separated is ...
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Magnetic field sensor for oscilloscope

I want to measure magnetic fields with my oscilloscope, so I need a magnetic field sensor / probe. My oscilloscope does a FFT for 50Hz to 2MHz. The sensor should be 3D, because I don't care for ...
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28 views

Accuracy in BLDC speed calculation

What is an accurate manner to calculate the rotational speed of a bldc motor using hall sensors and microcontroller units, considering both floating point operations and length of the observed period (...
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Identification of a threaded connector (on a speed sensor)

I'm trying to identify the mating connector for this speed sensor. The sensor in itself is a custom CNC job so no datasheet available... It's got three pins and 5 "grooves". The exterior thread is a ...
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1answer
63 views

Make shed light come on, if dark outside and door is open (with NPN and hall-effect sensor) [closed]

I recently purchased a new shed with a polycarb roof. At night, when I enter the shed, I'd like a light that comes on (but not during the day!). I'm trying to find a way for the light to switch on, ...
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1answer
79 views

How to calculate RPM from a square wave signal Voltage-Time graph

I'm struggling to understand how to show the relationship between the input and output of a hall effect sensor used as a wheel speed sensor through mathematical expression. How can I calculate the RPM ...
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Hall effect sensor model in LTSpice

I am working on hall effect based current meter and I run into some troubles running my simulation in LTspice. To be precise I am no sure how to accurately model hall effect sensor. In less accurate ...
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186 views

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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42 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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69 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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82 views

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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252 views

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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1answer
68 views

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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2answers
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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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2answers
89 views

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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1answer
63 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
238 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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95 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
45 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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1answer
158 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
61 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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2answers
345 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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180 views

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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194 views

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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2answers
70 views

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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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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2answers
311 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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52 views

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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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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