Power & SWR Meter – New Graphical OLED Interface

A short demonstration of my latest version of the Power & SWR Meter, built around a Teensy 4.0 and a 256×64 NHD-3.12-25664UCB2 OLED display. The original measurement and calibration system has been retained, while the complete user interface has been redesigned into a modern graphical instrument-style display. The new interface includes graphical setup menus, Power Bar Scale adjustment, SWR Alarm settings, PEP and Peak Hold settings, display options, Factory Reset, multi-page Diagnostics and a completely redesigned Calibration section. Special attention was given to making the encoder operation simple and predictable: one encoder click equals one adjustment step. The diagnostics section now provides live information about forward and reflected signals, ADC values, detector voltages, RF power, SWR, PEP and ADC health. The calibration interface also shows the calibration reference level together with the detected FWD/REV signal and calibration status in real time. The goal of this project is a fast, accurate and easy-to-use RF Power/SWR meter with a clean professional user interface. Hardware: Teensy 4.0 NHD-3.12-25664UCB2 256×64 OLED Rotary encoder High-speed AD7991 ADC acquisition Directional coupler input Forward and reflected power measurement SWR, Peak Power and PEP measurement Designed and developed by J.G. Holstein – PD0LEW. #HamRadio #AmateurRadio #SWRMeter #PowerMeter #Teensy #RF #Electronics #OLED #Homebrew #PD0LEW