rotary encoder

common example

this example doesn't read the inputs fast enough and isn't a functional option for rotary encoder use.

// Rotary Encoder Inputs

#define CLK 2

#define DT 3

#define SW 4

int counter = 0;

int currentStateCLK;

int lastStateCLK;

String currentDir ="";

unsigned long lastButtonPress = 0;

void setup() {

// Set encoder pins as inputs

pinMode(CLK,INPUT);

pinMode(DT,INPUT);

pinMode(SW, INPUT_PULLUP);

// Setup Serial Monitor

Serial.begin(9600);

// Read the initial state of CLK

lastStateCLK = digitalRead(CLK);

}

void loop() {

// Read the current state of CLK

currentStateCLK = digitalRead(CLK);

// If last and current state of CLK are different, then pulse occurred

// React to only 1 state change to avoid double count

if (currentStateCLK != lastStateCLK && currentStateCLK == 1){

// If the DT state is different than the CLK state then

// the encoder is rotating CCW so decrement

if (digitalRead(DT) != currentStateCLK) {

counter --;

currentDir ="CCW";

} else {

// Encoder is rotating CW so increment

counter ++;

currentDir ="CW";

}

Serial.print("Direction: ");

Serial.print(currentDir);

Serial.print(" | Counter: ");

Serial.println(counter);

}

// Remember last CLK state

lastStateCLK = currentStateCLK;

// Read the button state

int btnState = digitalRead(SW);

//If we detect LOW signal, button is pressed

if (btnState == LOW) {

//if 50ms have passed since last LOW pulse, it means that the

//button has been pressed, released and pressed again

if (millis() - lastButtonPress > 50) {

Serial.println("Button pressed!");

}

// Remember last button press event

lastButtonPress = millis();

}

// Put in a slight delay to help debounce the reading

delay(1);

}

superior example

this code works for my purposes; this is a test format and the clock directions might be backwards. I don't care enough to check.