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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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
130 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
81 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
588 views

Will it work if I place hall sensor heads facing magnets in outrunner brushless motor

Will it work if I place hall sensors facing the magnets like in the picture below? I cannot put it in between the teeth because the hall sensor is bigger than the gap.
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67 views

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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1answer
47 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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28 views

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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60 views

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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1answer
391 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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3answers
267 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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74 views

Falling Marble Sensor

I'm really building a sort of Rube Goldberg machine that students will assemble in order to guide a falling ball down through a series of gates/openings, where I need to detect when they're successful ...
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41 views

Pushbutton + relay + hall sensor

I need to find a solution to start a relay with a momentary pushbutton and stop it with a hall sensor. The rellay would control ~1000W. I was thinking of two possible solutions: analog: pushbutton ...
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2answers
201 views

Convert a hall-effect flow meter to operate as on-off switch

I'd like to convert a hall-effect flow meter to operate as on-off switch. the output is in pulses, which arrive at a rate proportional to the flow rate. what I would like to do is have a circuit ...
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1answer
175 views

closed loop hall effect sensor operation

I know that closed loop hall effect sensors generate a current in the secondary winding to oppose the flux in the core such that the net flux will equal zero. At this point the current in the primary ...
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1answer
507 views

Relating Hall sensor outputs to absolute rotor position (Which combination corresponds to which angle)

I have a working 6-step BLDC commutation which works based on the Hall effect sensor outputs. I would like to apply the same code to another motor, which doesnt have Hall sensors but an absolute rotor ...
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283 views

Measuring the angle of finger joints

I'm working on a project where I want to very accurately (+/- 1 degree) determine the angle at which a finger is bent. One of my main constraints is that my sensing mechanism can't interfere (much) ...
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2answers
53 views

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)?