Interrupts

noInterrupts()

noInterrupts

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.

// SYNTAX
noInterrupts();

noInterrupts() neither accepts a parameter nor returns anything.

You must enable interrupts again as quickly as possible. Never return from setup(), loop(), from a function handler, variable handler, system event handler, etc. with interrupts disabled.