forum.hobbycomponents.com

Hi all,
I'm an amateur radio operator, I've built myself a Magnetic Loop consisting of copper loop, Vacuum capacitor and a Unipolar stepper motor.
Connected between the vac cap and the stepper motor is a multi turn potentiometer (the cap and potentiometer both have ten turns from start to finish)
The potentiometer is rated from 1 volt to 10 volts.
Question:
Is it possible for the Arduino and a display unit to read the incoming volts from the pot and display them as MHz?
For example can I program the Arduino to read 5v from pot and tell the display to show 7.1MHz?
Which means as I turn the pot ten turns from 1v up to 10v the display will actually show 3.5MHz to 21.1MHz...
Is that possible?
I know I could use a 10v moving coil meter but I want to keep it "digital" if possible.
Thanks for any help.
Regards Dave.

Yes this is possible as the Arduino boards have analogue input pins that allow them to read in an analogue voltage and convert it to a number. The only issue is that they can only measure voltages up to a maximum of 5V. You will therefore need to divide your voltage by 2 before applying it to one of the analogue pins of the Arduino. The easiest way to do this would be with a potential divider of say a couple of 5K resistors but as your pot is a relatively large value this would have a loading effect on it and make it slightly non-linear.

Thanks for that Andrew,
I'll see if I can got hold of a multi turn 5v potentiometer.