The example code for the Leonardo serial port requires you to wait, for example:
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) { }
Add in the line after Serial.begin and it should work better.
The example code for the Leonardo serial port requires you to wait, for example:
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) { }
Add in the line after Serial.begin and it should work better.