Arduino sketch for tuner module with chip NXP-TEF6686 [F8602_F8605] or NXP-TEF6687 [F8705] controlled with TEF-GTK user interface.
In TEF-GTK the button SET 1,2,3,4 contains different settings for NXP-TEF6686 chip.
Thanks - VoXiTPro https://github.com/voxit1512/Tef6686
PCB: https://www.pcbway.com/project/shareproject/PCB_for_TEF6686_and_TEF_GTK_7ae7c25a.html
Tested on Arduino Nano V3.0 / 5V