using for loops to control LEDs the for statement allows us to repeat a block of commands a limited number of times arduino.cc

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same circuit as before 470W digital I/O pin 2

these sketches both make the LED blink 5 times without for statement with for statement void setup(){ pinMode(11, OUTPUT); digitalWrite(11,HIGH); delay(200); digitalWrite(11,LOW); delay(200); } void loop() { void setup(){ pinMode(11, OUTPUT); for(int i=0; i<5; i++) { digitalWrite(11,HIGH); delay(200); digitalWrite(11,LOW); delay(200); } void loop() {

how the for statement works declare i as an integer (a number that can vary between -32,768 and 32,767) the first value of i will be zero continue to loop as long as i is less than 5 increment i each time through loop i=0 the first time through loop i=1 the second time through loop i=2 the third time through loop i=3 the fourth time through loop i=4 the fifth time through loop for(int i=0; i<5; i++) { digitalWrite(11,HIGH); delay(200); digitalWrite(11,LOW); delay(200); }

incrementing for loops for(int i=0; i<5; i++) { } - increment i by one each time (0,1,2,3,4) for(int i=100; i>20; i--) { } - decrement i by one each time (100,99,98,…) for(int i=0; i<80; i+=2) { } - increment i by 2 each time (0,2,4,6,…) for(int i=50; i>=0; i-=5) { } - decrement i by 5 each time (50,45,40,…) for(int i=2; i<100; i=i*1.5) { } - multiply i by 1.5 each time (2,3,4,6,9,13,…)

play around with incrementing and decrementing for loops void setup() { Serial.begin(9600); for(int x=0; x<100; x++) { Serial.println(x); } void loop() { send output to serial monitor