Rf power meter with arduino ad8307 and oled by rudi imbrechts on7ir january 2019.
Arduino rf power meter.
Because my primary interest was for vhf uhf shf i have foreseen positions for 6m 4m 2m 70 cm 23cm and 13cm bands.
As this monimatch type of bridge is frequency dependant the meter must be calibrated for every band.
Because my primary interest was for vhf uhf shf i have foreseen positions for 6m 4m 2m 70 cm 23cm and 13cm bands.
They work really well 0 12v inputs 15 bit useful range.
The project uses an arduino pro mini board whose adc feature is used along with the concept of ohm s law and voltage divider circuit to develop this wattmeter.
As this monimatch type of bridge is frequency dependant the meter must be calibrated for every band.
This sketch will readout rf power and swr from any swr bridge for example monimatch type.
For the 2 048 volt reference you can use every reference chip you like.
This is a project based on arduino board which can measure the power consumption of the devices.
Some parts do need a serial resistor some.
In the arduino sketch i compensate for the loss in the rf tap by altering the intercept point used for the power calculation.
Using 10 1 turns would see 1 of the rf current at the reference resistor.
Main arduino code that runs on the m5stack with graphics and buttons.
The little arduino nano uses the forward and reverse dc voltages to calculate rf power and voltage standing wave ratio.
This figure is calculated from the power vs voltage slope of the ad8307.
Code is based on sketch of mike richards g4wnc and adapted for use with an i2c oled display some display functions added.
Rf power meter with 1mhz 10ghz bandwidth and 55db dynamic.
Current ratio is proportional to the ratio squared.
When we connect this wattmeter on to a device which is in operation the 16 2 lcd displays its power consumption value in watts.
Has some new ads1100 files to support external i2c connected adss1100 16bit adc units from m5stack.
Arduino rf power swr meter.
This sketch will readout rf power and swr from any swr bridge for example monimatch type.
The intercept point is the power input required by the ad8307 to give a theoretical 0v output.
The sampling fractions usually is proportional to the square of the turns.
