Voltage and current sensors maybe?

Other Hardware Sensors
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I'm getting to the point. I need to add a current and voltage sensor to my project. I have an server motherboard that is pure 12v input. I have a bunch of 30a cheap current sensors I bought from amazon for testing but never used before. they are the 30A ACS712. and the voltage sensor are just a bunch of resistors on a pcb from amazon too. Can use this page for reference https://www.amazon.com/dp/B0CZMW1W24?ref=ppx_yo2ov_dt_b_fed_asin_title.

So my question is the input power is an pin EPS that they use on motherboards. and the current sensor is an 30 amp. However that little connector on the pcb I know common sensor Can not handle 30 amps not even the traces on the pcb ether.

Sorry let me rephrase this question. Should I use multiple sensor sensors 2 each wires per sensor same with the voltage sensor or more? The other question is Would it be better to connect to the positive+ of the wiring or the negative- of the wiring for the sensors? I have never used a cuurrent sensor before.

Joseph

3

Just because the current sensor CAN measure 30A doesn't mean you HAVE TO run 30A through it. Just find out what the board is using, most Arduino boards are limited to 200mA but with external power you may see many Amps drawn.

The Voltage sensor that comes on Arduino boards is the ADC, aka analog-in. It senses a 1 microAmp sample that doesn't steadily drain current to work but it takes longer to get a value.

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One current sensor and one voltage sensor is all you need.

Would it be better to connect to the positive+ of the wiring or the negative- of the wiring for the sensors?

Connect both the current and voltage sensors to the positive +
Only use the negative side if you have no choice and even then it's generally not a good idea.

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@GoForSmoke the server motherboard calculating everything is 18amps. I says 20 amps for some over head room.

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The weakest point on the connector will be how the conductor is attached. Assure the stranded wire is properly stripped, keeping its natural twist.
Exposed wire should be clean, without tarnish or oxidation.
Do not over torque the screw.

For reference, a 30mm trace of 1oz copper carrying 30A with a 10°C rise should have 33mm total width. Divide that by 2 if there are traces on both sides stitched with vias.
Use this for reference.
https://www.pcbway.com/pcb_prototype/trace-width-calculator.html

Maybe this will ease your concerns.

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