sense resistor coupling

Thread Starter

gehan_s

Joined Sep 17, 2012
38
hey all,

i have a 0R5 sense resistor in the neutral side of the AC mains. i need to isolate this input and feed it to a PIC microcontroller. how do i do this???? (there is about a maximum of 4A rms curent flowing through it)

thanks !!!!!!!!!!!!!!!
 

Thread Starter

gehan_s

Joined Sep 17, 2012
38
Thank you ScottWang and spinnaker. I did consider the Hall Effect Sensor earlier. Can you please tell me why you think the series resistor is a bad idea ? Is the Hall Effect Sensor more accurate than using a series resistor ?
 

spinnaker

Joined Oct 29, 2009
7,830
Thank you ScottWang and spinnaker. I did consider the Hall Effect Sensor earlier. Can you please tell me why you think the series resistor is a bad idea ? Is the Hall Effect Sensor more accurate than using a series resistor ?
I thought that was obvious.

You would like to go on living and / or have you house not catch on fire right?
 

ErnieM

Joined Apr 24, 2011
8,377
Can you please tell me why you think the series resistor is a bad idea ?
One thing usually overlooked by those using this scheme is you are intentionally breaking the safety bond between neutral and ground by that very same sense resistor.

Thus your entire unit is less safe then one observing a proper neutral connection.
 
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