With the firmware version 1.9.0 there are some minor enhancements:

• Peak-hold works now, when offset is set
• Meter and diagram works in dBm and W mode

Here are the required files:

• Sketch
• AD7887 library
• AD8318 library
• PeakHold library
• NeoNextion library

Installation

Sketch

Copy the sketch to the Arduino sketchbook subdirectory. The folder can be located, using the "File/Preferences" window:

All files from the Sketch-ZIP file must be located in this subdirectory. The name of the subdirectory must match the name of the ZIP-file.

Libraries

Please copy the libraries into the library subdirectory of your Arduino IDE:

The library folder is inside the "sketchbook location":

For each of the libraries, you must create a subdirectory and copy the files into this directory. The name of the subdirectory must match the name of the ZIP-files.

Nextion data

Please also upload the new HMI file to the display. For more information how to do this, please check this post.