jit_singh_tara
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Hello frnds ,
Please clarify my doubt :
If we want to measure ac mains voltage rms .
1.We scale down 240Vac RMS(340V Peak) to say 3.53 AC RMS( 5V peak).
2. Now if we want to read this peak voltage which is with respect to neutral ,from adc of microcontroller , then since uC runs on 5V and Gnd , Will uC be able to read the 5V peak ac voltage .
What about the neutral of scaled 5v ac , and gnd of uc supply .
Can we read directly from mcu as the neutral and gnd are at different potential , or are they at same potential.
If they are at same potential can we connect them together Gnd and Neutral of the scaled 240V ac mains......
Please clarify how to read ac mains voltage directly from microcontroller adc for rms voltmeter.
thanks....
Please clarify my doubt :
If we want to measure ac mains voltage rms .
1.We scale down 240Vac RMS(340V Peak) to say 3.53 AC RMS( 5V peak).
2. Now if we want to read this peak voltage which is with respect to neutral ,from adc of microcontroller , then since uC runs on 5V and Gnd , Will uC be able to read the 5V peak ac voltage .
What about the neutral of scaled 5v ac , and gnd of uc supply .
Can we read directly from mcu as the neutral and gnd are at different potential , or are they at same potential.
If they are at same potential can we connect them together Gnd and Neutral of the scaled 240V ac mains......
Please clarify how to read ac mains voltage directly from microcontroller adc for rms voltmeter.
thanks....