Hi there,
Yes, If you disconnect the USB the code may be waiting if so , and you don’t indicate if it freezes or stops?
ie.
while(!Serial); //When the serial port is opened, the program starts to execute.
GL 
PJ
Hi there,
Yes, If you disconnect the USB the code may be waiting if so , and you don’t indicate if it freezes or stops?
ie.
while(!Serial); //When the serial port is opened, the program starts to execute.
GL PJ