I tried to make a simple test using Aduino Uno, a USB serial cable and Blynk. Worked ok.
But then I also tried to set ut a blinking diode locally controlled by Arduino. Did not work.
When I commented out all program code that referes to Blynk, then the blinks worked.
I found a discussion tread. The programming of these physical buttons is not like “it use to be” it looks more like input to Blynk.
Does Blynk work in such a way that it overrides all ordinary Arduino local control? Does that mean that an automated system based on Arduino/Blynk wil stopp working if you switch of your mobile phone?
(If this should be the case it should be possible to solve the problem using two Arduinos, one for “local control” and one for “managed by Blynk”.)