int brightness = 120; // how bright the LED is, start at half brightness
int fadeAmount = 10; // how many points to fade the LED by
unsigned long currentTime;
unsigned long loopTime;
const int pin_A = 12; // pin 12
const int pin_B = 11; // pin 11
unsigned char encoder_A;
unsigned char encoder_B;
unsigned char encoder_A_prev=0;
void setup() {
// declare pin 9 to be an output:
pinMode(9, OUTPUT);
pinMode(pin_A, INPUT);
pinMode(pin_B, INPUT);
currentTime = millis();
loopTime = currentTime;
}
void loop() {
// get the current elapsed time
currentTime = millis();
if(currentTime >= (loopTime + 5)){
// 5ms since last check of encoder = 200Hz
encoder_A = digitalRead(pin_A); // Read encoder pins
encoder_B = digitalRead(pin_B);
if((!encoder_A) && (encoder_A_prev)){
// A has gone from high to low
if(encoder_B) {
// B is high so clockwise
// increase the brightness, dont go over 255
if(brightness + fadeAmount <= 255) brightness += fadeAmount;
}
else {
// B is low so counter-clockwise
// decrease the brightness, dont go below 0
if(brightness - fadeAmount >= 0) brightness -= fadeAmount;
}
}
encoder_A_prev = encoder_A; // Store value of A for next time
// set the brightness of pin 9:
analogWrite(9, brightness);
loopTime = currentTime; // Updates loopTime
}
// Other processing can be done here
}
