break is used to exit from a do, for, or while loop, bypassing the normal loop condition. It is also used to exit from a switch statement.
for (x = 0; x < 255; x ++){digitalWrite(PWMpin, x);sens = AnalogRead(sensorPin); if (sens > threshold){ // bail out on sensor detectx = 0;break;} delay(50);}
The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.