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/**
* Rotary Encoder Accelleration
* - Debug for KY-040
*
* interrupt pins:
* 2, 3 - Arduino UNO/Nano
* D5,D6 - ESP8266 NodeMCU
*/
#define DEBUG false
// Rotary Encoder Inputs
#if defined (ARDUINO_AVR_UNO) || defined (ARDUINO_AVR_NANO)
#define CLK 2
#define DT 3
#elif defined (ESP8266)
#define CLK D5
#define DT D6
#endif
#define SW 4
#define PRESS_TIME_SHORT 20 // [ms] short press
#define PRESS_TIME_LONG 2000 // [ms] long press
#define ROTARY_FAST 15 // [ms] rotary speed fast
#define ROTARY_SLOW 200 // [ms] rotary speed slow
#define INCREMENT_SLOW 1
#define INCREMENT_FAST 10
int counter = 0, increment = 0;
int currentStateCLK, currentStateSW, lastStateCLK, lastStateSW;
String currentDir = "";
unsigned long lastButtonPress = 0, lastButtonTime;
void setup() {
// Set encoder pins as inputs
pinMode(CLK,INPUT);
pinMode(DT,INPUT);
pinMode(SW, INPUT_PULLUP);
// Setup Serial Monitor
if (DEBUG) Serial.begin(9600);
// Read the initial state of CLK
lastStateCLK = digitalRead(CLK);
lastStateSW = digitalRead(SW);
if (DEBUG) Serial.println("Rotary Encoder Debug:");
}
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((millis() - lastButtonTime) > ROTARY_SLOW) {
increment = INCREMENT_SLOW;
if (DEBUG) Serial.print("[SLOW]> ");
}
else if((millis() - lastButtonTime) > ROTARY_FAST) {
increment = INCREMENT_FAST;
if (DEBUG) Serial.print("[FAST]> ");
}
else {
if (DEBUG) Serial.print("[ROT BOUNCED]");
increment = 0;
}
lastButtonTime = millis();
// If the DT state is different than the CLK state then
// the encoder is rotating CCW so decrement
if (digitalRead(DT) != currentStateCLK) {
counter = counter - increment;
if (DEBUG) Serial.print(" Decrement: ");
if (DEBUG) Serial.print(increment);
currentDir ="CCW";
} else {
// Encoder is rotating CW so increment
counter = counter + increment;
if (DEBUG) Serial.print(" Increment: ");
if (DEBUG) Serial.print(increment);
currentDir ="CW";
}
if (DEBUG) Serial.print(" | Direction: ");
if (DEBUG) Serial.print(currentDir);
if (DEBUG) Serial.print(" | Counter: ");
if (DEBUG) 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 ((lastStateSW == HIGH) && (btnState == LOW)) lastButtonPress = millis();
if ((lastStateSW == LOW) && (btnState == HIGH)) {
// Check button pressed time
if (millis() - lastButtonPress > PRESS_TIME_LONG) {
if (DEBUG) Serial.println("Long Button pressed!");
} else if (millis() - lastButtonPress > PRESS_TIME_SHORT) {
if (DEBUG) Serial.println("Short Button pressed!");
}
// Remember last button press event
lastButtonPress = millis();
}
lastStateSW = btnState;
// Put in a slight delay to help debounce the reading
delay(1);
}
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