SWR / Wattmeter with Arduino Uno Shield

The project details a DIY SWR/Wattmeter designed around an Arduino Uno shield, providing capabilities to measure RF power from 2 to 200 watts and Standing Wave Ratio (SWR) for HF amateur radio bands. This construction features a compact design, integrating the measurement circuitry directly onto a custom PCB that interfaces with the Arduino Uno microcontroller.

Key components include a directional coupler for sensing forward and reflected power, precision rectifiers, and analog-to-digital conversion for processing RF signals. The Arduino firmware handles calibration, calculations, and displays the results on an integrated LCD, offering real-time feedback on antenna system performance. The design prioritizes simplicity for homebrewers.

Performance specifications indicate accurate readings within the 2-200W power range, suitable for typical QRP to medium-power HF operations. The project provides schematics and a basic overview of the software logic.