Disables interrupts (you can re-enable them with interrupts()). Interrupts allow certain important tasks to happen in the background and are enabled by default. Some functions will not work while interrupts are disabled, and incoming communication may be ignored. Interrupts can slightly disrupt the timing of code, however, and may be disabled for particularly critical sections of code.
noInterrupts()
None
Nothing
The code shows how to enable interrupts.
void setup() {}
void loop() {
noInterrupts();
// critical, time-sensitive code here
interrupts();
// other code here
}
Note that disabling interrupts on the Arduino boards with native USB capabilities (e.g., Leonardo) will make the board not appear in the Port menu, since this disables its USB capability.