Please also refer to the site below. https://github.com/soligen2010/dspmeterv1
Standalone Signal Analyzer (I2C Type Signal-Meter) for uBITX - Arduino Nano Version
I do not claim any license for my code. You may use it in any way. I just hope this will be used for amateur radio. The other person's source code (CW Morse code) follows the original author's license.
Ian KD8CEC