10GHz AD8317 RF power meter

Features

• -55 to 0 dBm RF power measurement up to 10 GHz
• 2-point calibration (linear function), separate for each band
• Measuring average, max (peak) and min power.
• Ability to use an external RF attenuator
• Headless mode - control over serial only
• Display power in dBm, mW or W
• External attenuator support - 0..60 dB in 10 dB steps

Parts

• Arduino Nano
• AD8317 power meter module
• SSD1306 128x32px OLED display
• LM4040 reference voltage (2.048 V)

Assembly

• Build and flash Arduino software
• Build a voltage reference and connect it to AREF pin of Arduino, VCC (5V) and GND.
• Connect AD8317 module output to A0 pin of Arduino, connect the grounds together. Provide 5V to the module.
• Connect OLED display to VCC, GND & SDA (A4), SCL (A5) Arduino pins.
• Connect buttons to pins D9 and D10. They should short pins to GND when pressed, internal pullup is used. GND is also available on D8.

Calibration

• Power the meter while pressing a button
• "CALIB" should appear on the screen, raw ADC value will be displayed
• Select band and averaging, as well as current generator level (-40 or -10 dBm by default)
• Select "SAVE" and click SET button to save the calibration value to EEPROM
• To make sure the calibration has been saved correctly, open serial port (115200 bps) and send "p" letter to the meter
• Table with raw calibration values will be printed via serial terminal

TODO

• Add buttons [done]
• Show power also in mW/W [done]