Questions tagged [current-sensor]
The current-sensor tag has no usage guidance.
33 questions
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Current Sensors to view peak/ surge current drawn by BLDC motor
I'm using a 24 V BLDC motor with an inbuilt hall current sensor. While running it at different speeds, the motor stalls randomly. I have plotted the data from the current sensor, and there is no ...
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82
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Current transducer: no voltage
I am working on a project that requires non-contact current measurement. I found the LEM LA 25-P active current transducer. I've put the connection diagram from the datasheet here.
My understanding is ...
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287
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Need to understand the current sensor connection in this circuit
I'm working on creating a smart power meter for my home, and I found this tutorial. I want to understand each part of the circuit, and the tutorial covers everything. However, it doesn't explain why ...
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Measuring AC current using LEM HAIS 50P
I am working on LEM HAIS 50P current sensor and I'm using it for measuring AC current. I have an offset of 2.5V, so at 0A the output of the sensor is 2.5v which is as expected but if I increase the ...
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3
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395
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Designing Eddy Current Sensor?
I am looking to build a eddy current sensor, I am having difficulty finding information on how I should be designing the sensor to fit my needs. There's a few studies and articles I've found that ...
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136
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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 ...
- 299
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771
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Footprint of current sense resistor for kelvin connection
I need a current sense resistor for my application and I want to add Kelvin connections to it. I found this in the datasheet of a 4 terminal resistor but the footprint doesn't contain "sensing ...
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265
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LEM current transducer 2.5 V internal reference
I am testing a LEM LTSR-25-NP current transducer. According to the datasheet, the current transducer should be outputting 2.5 V +/- 0.025 V when the input current is 0 A, but this is not what I am ...
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341
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How can we say this current sensor doesn't measure DC?
Digikey is saying this current sensor "CS0305B" from CUI Devices can measure AC and not DC.
But in datasheet there is no reference or note mentioning this current sensor will not measure DC.
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2
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568
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What does sensitivity mean for a current sensor when given in "mV/N" or "mV/mT" rather than "mV/A"?
I have been analyzing various datasheets of current sensors and majorly getting sensitivity given in "mV/A," from which I understand the output voltage per 1 ampere. I do not understand it ...
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304
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Most accurate way to measure universal (AC) motor current?
I'm designing a control circuit for a universal (AC) motor (single phase, brushed).
I've simulated the control circuit and it works as expected.
Circuit below is controlled by a STM32G4 series ...
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610
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Bidirectional Hall current sensor signal conditioning (shift and scale sensor output voltage)
I am using a Hall current sensor in circuitry where I need to implement signal conditioning in order to improve accuracy of measurement. The Hall sensor outputs 1 volt when measuring maximum current ...
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752
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Detect 1 mA current with an Arduino
Which sensor can measure current as small as 0.1 mA?
I have tried many sensors with an Arduino, but none satisfy the requirement.
Power supply 5 V, independent current measurement
I want to measure ...
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147
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How can I calculate current with load switch? [closed]
I want to use a load switch for protecting my PCB.
I also want to watch/measure the current drawn by my board.
How can I sense/measure the current drawn by my board, using a load switch like the ...
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271
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INA219 current sensor allowing only 300mA of current between its VIN+ and VIN- terminals. Why?
I'm building an Arduino circuit to detect/limit the maximum charging current to a camera flash.
I decided to use an INA219 breakaout board, which comes with a R100 resistor as a shunt so it should ...
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781
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OpAmp/Comparator for AC current detector circuit
I am trying to complete schematic for current detector. This is addition on How to build AC current sensor circuit for ESP-01 GPIO.
By googling and researching I came with following schematic which I ...
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362
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Asymmetrical output
I was searching for a current sense amplifier for measuring the current between a power supply and a battery i.e high side.
I found the INA240A1 (evaluation module here).
When I look at the ...
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430
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Precision rectifier doesn't give expected output
I'm currently designing a precision rectifier. I have a current sensor that outputs a current (AC) of 0.3mA to 32mA for 0-100A across a resistor of 510 ohms. As the value of the voltage will be around ...
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401
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How to connect two current sensors together?
I have two ACS712 current sensor modules, sensing different things, connected to a PIC 12F683. I'd like the PIC to do something if either of them senses a current. Individually, the sensors work ...
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152
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Need to check ON or OFF state of a wire using non-invasive method
We have a GSM SMS alert system (mod bus) that needs a signal that a wire (any wire from 3-phase) has current (maximum 15 amperes in ON state) or not, so we can know if the system is ON or OFF.
There ...
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1
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174
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Current carrying capabilities of surface mount ICs
While putting together a PCB project, I have come across the ACS724 current sensor, for measuring AC/DC current in high ranges up to 50 amps. This chip uses hall effect for measurement and is a 'pass-...
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163
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Calculating FIT for Magnetic Sensors
We have qualified one of our magnetic sensors (80 samples, 1000 hours - JEDEC) with zero failures and we are asked to provide a FIT. The product is not repairable so I would think an MTTF would be ...
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89
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Measuring high currents with toroids
I got a PT27312 current sensor (datasheet), I wonder if I can use it to measure currents up to 100A AC/DC.
I couldn't find any specifications in respect of the current measurement range.
I only know ...
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Rectifier circuit for ACS712 with 3.3V ADC
I'm using an ACS712-5A hall effect current sensor that output a voltage roughly between 1.5V to 3.5V. I'm am measuring a main AC power line at 50Hz. I'm using and ESP32 which has a built-in ADC with a ...
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Driver circuit for Figaro FECS sensor - specifically FECS44-100
I need help designing a driver circuit for a Figaro ammonia sensor FECS44-100
I also have in my possession, the official evaluation module EM-FECS(A)
The schematic for this (on page 2 of the link) ...
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2k
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Battery level sensor
I'm designing a smart bin for my paper and would like a sensor that continuously monitors the battery level in real time and in percentage value and then sends the data to the administration office.
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2
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270
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How to measure load detection for ballast output 18W
I have a high performance ballast of only 18 and 36 W. I would like to do a detection circuit whenever the UV light tube does not have any light out, an alarm/signal can be triggered to replace the ...
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848
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Is there a way to put a relay in series with another load?
To layout my situation, I have a 12V DC pump with a built in float switch that I don't want to try to crack open and possibly compromise the waterproof of. The pump draws around 6-7 amps. I would ...
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72
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hardware interfacing and data logging
I am working on a idea. The idea is to measure current from a current source, which transmits 3 levels (ex: 10 20 30mA). Which if possible should be logged, representing 3 states with 3 different ...
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181
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Real Time AC Current Sensing [closed]
I'm trying to analyse the harmonics present in different household devices's current waveforms. For this, I need a CT based current sensor which can sample data quite accurately and quickly (around 5% ...
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2k
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wcs1800 current sensor (with sensitivity of 66mV/A) output voltage varies unexpectedly with a range of 10 - 20mA
I am using wcs1800 sensor to read current in the range of 100mA to 30A, even though the sensor has a sensitivity of ~66mV/A (5V input) and ~50mV/A (3.3v input) the output voltage is varied in the ...
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353
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4Amps current sensor circuit with lm358
I have a 12v motor. I want to operate 12v 7amps relay with lm358 opamp.
when my motor is operate it gives 0.8 Amps, but when it get jammed then it consumes 4Amps, at that time I want to cut down my ...
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257
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Calculate the input impedance of a passive AC voltage sensor
I got a AC voltage sensor to measure AC voltage. And I want to know its input impedance. But the sensor's data sheet only tells how to use it, doesn't tell the internal details. It's used as below:
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