Questions tagged [current-sensor]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
1answer
38 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 ...
0
votes
1answer
52 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 ...
1
vote
1answer
64 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 ...
0
votes
2answers
66 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 ...
0
votes
1answer
85 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 ...
1
vote
3answers
86 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 ...
0
votes
2answers
59 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 ...
1
vote
1answer
72 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-...
0
votes
1answer
41 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 ...
0
votes
1answer
70 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 ...
0
votes
1answer
1k 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 ...
0
votes
0answers
67 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) ...
0
votes
1answer
380 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. ...
0
votes
2answers
151 views

How to measure load detection for ballast output 18W

I have a high performance ballast of only 18W and 36W. 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 ...
0
votes
1answer
237 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 ...
0
votes
1answer
66 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 ...
0
votes
2answers
133 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% ...
0
votes
1answer
1k 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 ...
0
votes
1answer
311 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 ...
0
votes
1answer
224 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: ...