A bool holds one of two values, true or false. (Each bool variable occupies one byte of memory.)
bool var = val;
var: variable name.val: the value to assign to that variable.This code shows how to use the bool datatype.
int LEDpin = 5; // LED on pin 5
int switchPin = 13; // momentary switch on 13, other side connected to ground
bool running = false;
void setup() {
pinMode(LEDpin, OUTPUT);
pinMode(switchPin, INPUT);
digitalWrite(switchPin, HIGH); // turn on pullup resistor
}
void loop() {
if (digitalRead(switchPin) == LOW) {
// switch is pressed - pullup keeps pin high normally
delay(100); // delay to debounce switch
running = !running; // toggle running variable
digitalWrite(LEDpin, running); // indicate via LED
}
}