Lesson3 Interactive LED Flowing Lights

Project 6 – Interactive LED Chase Effect

int ledNum = 8; //the number of the led you attach
byte ledPin[] = {2, 3, 4, 5, 6, 7, 8, 9}; // Create array for LED pins
int ledDelay; // delay between changes
int direction = 1;
int currentLED = 0;
unsigned long changeTime;
int potPin = 0; // select the input pin for the potentiometer

void setup() {
for (int x = 0; x < ledNum; x++) { // set all pins to output pinMode(ledPin[x], OUTPUT); } changeTime = millis(); } void loop() { ledDelay = analogRead(potPin); // read the value from the pot if ((millis() – changeTime) > ledDelay) { // if it has been ledDelay ms since last change
changeLED();
changeTime = millis();
}
}

void changeLED() {
for (int x=0; x < ledNum; x++) { // turn off all LED’s
digitalWrite(ledPin[x], LOW);
}
digitalWrite(ledPin[currentLED], HIGH); // turn on the current LED
currentLED += direction; // increment by the direction value
// change direction if we reach the end
if (currentLED == ledNum-1) {direction = -1;}
if (currentLED == 0) {direction = 1;}
}