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Do I have to babysit you guys?
Look - here's a .1Ω shunt resistor for 52 cents, single quantity -
Digi-Key - 605HR100E-ND (Ohmite - 605HR100E)
here's a .01Ω shunt resistor for 40 cents, single quantity -
Digi-Key - 605HR010-ND (Ohmite - 605HR010)
this one's a chip resistor, but it's 1W, .001Ω, and only costs 35 cents in single-unit quantities -
ULR1R001FLFTR
Mainly the fact that it's AC. R15 is a "shunt resistor", and this is fine for DC circuits, but for AC it gets a little more tricky. You need to amplify the sine wave on it first, then rectify and filter it to measure it.
duffy....u seems to know how to measure the power usage using the nts-15p current transducer.
i've been doing some project on to measure the power using a voltage and current sensor n currently using the nts-15p.
the problem is the current and the voltage i've been applying is in ac n i dunno hw to interface the sensor to my microcontroller. cn u help me here??
another question is dat, is true, microcontroller only accept a sensor with a range of 0-5volts for the adc??
need help so much from u
thanx
hi,
On the 'ac' output of you 'nts' you require a 'precision rectifier', smooth the full wave output using a Res/Cap filter [dc].
The PIC's adc input will accept a 'dc' voltage in the range of 0V to +5V.
yeah thanx..
but however, i need to calculate the ac power, not dc.. is there anything i cn do with the rectified signal so that i cn obtain the actual ac power??
i mean if i get a value from 0-5volts from the adc, then, it is a discrete dc value rite??
sorry coz im a little bit confused when it comes to ac power