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

4. 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() {

5. 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); }

6. 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,…)

7. 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