You don't need an Arduino to measure power.
You need a load (10W) such as six 300 ohm 2 watt metal film resistors in parallel
and a 1n5711 diode to rectify the RF.? ? Look around the net as that is an easy build.
Read the voltage with a voltmeter (analog or digital).
I built mine a large fraction of a century ago small box, connector, load as described,
and a diode with binding posts for connecting the meter.??
Calibration, the easy was is apply known DC voltages across the load and note the?
DC meter reading after the diode.? Do this for many points and make a chart of?
power in for voltage out.
Calculate power in:
The power is: DCin^2/50=? (DC applied voltage squared then divide by 50).?
That works well enough to get to better than 5% accurate at least.
No need to use a microprocessor unless you have time to burn.
as then you need a opamp to linearize the diode and scale the input.
Allison
