Stewie911
Newbie level 6
What is the best way to measure current. It must be very accurate. Current can go as high as 1A.
It is basically current going into ground, so at the moment I am thinking of a precision 50 milli-ohm resistor just before ground with a 16bit ADC just before the resistor. The ADC has programmable gain of about 8 and I will use an OPAMP before the ADC that will also give gain.
As the current goes higher, the resolution doesn't have to be that good anymore.
For example:
0 - 10mA : possibly 50uA, but at least 100uA accuracy.
10-100mA : maybe 500uA accuracy
100mA - 1A : 1mA - 5mA accuracy.
Is there maybe a better way, like hall effect current sensors?
It is basically current going into ground, so at the moment I am thinking of a precision 50 milli-ohm resistor just before ground with a 16bit ADC just before the resistor. The ADC has programmable gain of about 8 and I will use an OPAMP before the ADC that will also give gain.
As the current goes higher, the resolution doesn't have to be that good anymore.
For example:
0 - 10mA : possibly 50uA, but at least 100uA accuracy.
10-100mA : maybe 500uA accuracy
100mA - 1A : 1mA - 5mA accuracy.
Is there maybe a better way, like hall effect current sensors?