Your oscilloscope is looking for changes in voltage as well.
No you do not need a current sensor.
What voltage were you reading on your scope? The arduino will only measure large voltages, so if it is less than a few mV it will need amplifying.
Your oscilloscope is looking for changes in voltage as well.
No you do not need a current sensor.
What voltage were you reading on your scope? The arduino will only measure large voltages, so if it is less than a few mV it will need amplifying.