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Questions tagged [current-sensor]

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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 ...
Nate Stumpff's user avatar
1 vote
1 answer
162 views

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 ...
M-125's user avatar
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1 answer
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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 ...
Madhura R's user avatar
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0 answers
21 views

Choosing the right current sensor for the PMSM motor drive application

I have a 400W PMSM motor. It has a rated current of 2.4A with 3000RPM and 108V. The motor datasheet says that it can go upto 4500 RPM with load current of 4A. The motor is HG-KR43. Now I want to read ...
Syed Kumayl Raza Moosavi's user avatar
2 votes
3 answers
200 views

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 ...
Mark's user avatar
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3 votes
0 answers
113 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 ...
W.Thomas's user avatar
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0 votes
2 answers
593 views

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 ...
Bananabread's user avatar
2 votes
1 answer
185 views

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 ...
Luis's user avatar
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2 votes
3 answers
338 views

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. ...
Karthick selva's user avatar
1 vote
2 answers
463 views

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 ...
Karthick selva's user avatar
0 votes
1 answer
264 views

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 ...
David's user avatar
  • 28
1 vote
1 answer
480 views

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 ...
The Arduino Guy's user avatar
-1 votes
1 answer
703 views

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 ...
Tuannhatdev's user avatar
0 votes
1 answer
135 views

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 ...
Ertugrul Sahin's user avatar
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1 answer
253 views

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 ...
Rodrigo's user avatar
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1 vote
1 answer
692 views

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 ...
moci's user avatar
  • 97
1 vote
2 answers
342 views

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 ...
Kranthi Kumar Banala's user avatar
0 votes
1 answer
374 views

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 ...
varun's user avatar
  • 165
1 vote
3 answers
342 views

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 ...
Alex's user avatar
  • 15
0 votes
2 answers
134 views

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 ...
Omair habib's user avatar
1 vote
1 answer
150 views

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-...
Simon 's user avatar
  • 11
0 votes
1 answer
153 views

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 ...
Kevin's user avatar
  • 1
0 votes
1 answer
86 views

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 ...
Electroprime70's user avatar
0 votes
1 answer
4k views

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 ...
Max's user avatar
  • 547
0 votes
0 answers
101 views

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) ...
Michael Ward's user avatar
0 votes
1 answer
1k views

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. ...
penguin99's user avatar
  • 859
0 votes
2 answers
256 views

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 ...
Nick's user avatar
  • 95
0 votes
1 answer
753 views

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 ...
farmy's user avatar
  • 11
0 votes
1 answer
71 views

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 ...
Newbee's user avatar
  • 41
0 votes
2 answers
178 views

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% ...
Aditya Madhusudhan's user avatar
0 votes
2 answers
2k views

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 ...
ASWIN VT's user avatar
0 votes
1 answer
346 views

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 ...
Hemant Patel's user avatar
0 votes
1 answer
255 views

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: ...
diverger's user avatar
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