I built the digital VFO with analog display described by JF3HZB. The wiring is very simple but I encountered an unexpected problem while compiling the code. After many unsuccessful attempts, I found the cause of the problem.
The ESP32 Packages 2.0.6 and 2.0.7 causes error during compilation. Version 2.0.5 or anterior should be used.
Here is the address to download the package :
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
The VFO works very well now, and thanks to JF3HZB and DJ7OO for the code, great job!.
JF3HZB Original project from (github) : https://github.com/tjlab-jf3hzb/Digital_VFO_with_analog_dial
DJ7OO description : http://www.kh-gps.de/vfo.htm
DJ7OO modifief code (V8) : http://www.kh-gps.de/vfo.zip
Marko Pavleski video : https://www.youtube.com/watch?v=KSovEpCmWY0&t=37s&ab_channel=MirkoPavleski
Marko Pavleski description : https://www.hackster.io/mircemk/universal-vfo-10-khz-160-mhz-with-retro-analog-scale-c7c5b6
S57UZU schematic : http://users.triera.net/zupanbra/Radioamater/Retro%20VFO.html