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Void problem


I try to send  to Arduino Mega from Nextion a variable number (ECdesir in my stech) when I release b12 button by a void, but nothing happens :

void b12PopCallback(void *ptr) {


 ECdesir = ECDESIR;


 Serial.print("EC user choice : ");



Thanks for help me tp understand this problem

(sorry for my bad english !)

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sorry, but the FIRST problem is, that this forum is already closed since Nov. 15 2017 ...