advice for connecting a current sensor

azk's picture
azk

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Joined: Feb 11, 2021

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advice for connecting a current sensor
February 11, 2021 - 9:59pm

Hello evryone,

 

I am new here so please have patience. I will try my best to explain.

 

I would like to measure the current on a sensor's line coming in the STM32 board. I have done some reasearch and, while I found quite a lot of current sensor which work with input 3.3V (such as MLX91221), I could not find one which is available on one of the popular PCB design websites like easyeda.com, but I have found some current sensors like ACS722 which are on the website and might work, but they use a 5V supply voltage.

My questions are as follow:

  • if I were to use the ACS722 to detect current, can I use, lets say a voltage divider or a step down converter to lower the voltage to 5V and power the ACS722? Another option would be to use an amplifier to amplify the ouput of 3.3V to 5V from the STM32 pins and input that into the ACS722 input?
  • do you know any other websites which might offer a more diverse range of components so I can find the actual desired component like MLX91221? I am having trouble to find some components, like 4N35 or the current sensor on the easyeda.com so perhaps there is a better choice for PCBs.

I apreciate any help! Thanks in advance!

 

azk's picture
azk

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Joined: Feb 11, 2021

Replies: 1

Sorry, I have seen I wrote a bit wrong. What I meant with the step down converter was to step down the 12V supply from the sensor to a 5V and input that to the sensor.

Sourav Gupta's picture

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Joined: Feb 12, 2018

Replies: 585

Use a a buck regulator to power the sensor