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InterruptFullStepButton.ino
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InterruptFullStepButton.ino
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/*
* MIT License
*
* Copyright (c) 2018-2021 Erriez
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* Button example full step Rotary Encoder with interrupts
* Source: https://github.com/Erriez/ErriezRotaryEncoderFullStep
* Documentation: https://erriez.github.io/ErriezRotaryEncoderFullStep
*/
#include <ErriezRotaryFullStep.h>
// Connect rotary pins to the DIGITAL pins of the Arduino board with interrupt
// support:
//
// +-----------------------------------+----------------------------+
// | Board | DIGITAL interrupt pins |
// +-----------------------------------+----------------------------+
// | Uno, Nano, Mini, other 328-based | 2, 3 |
// | Mega, Mega2560, MegaADK | 2, 3, 18, 19, 20, 21 |
// | Micro, Leonardo, other 32u4-based | 0, 1, 2, 3, 7 |
// | WeMos D1 R2 & mini (ESP8266) | 12 = D6; 13 = D7; 14 = D5 |
// +-----------------------------------+----------------------------+
//
#define ROTARY_PIN1 2
#define ROTARY_PIN2 3
#define ROTARY_BUTTON_PIN 4
// Initialize full step rotary encoder with internal pull-up pins enabled
// and default sensitivity=100
RotaryFullStep rotary(ROTARY_PIN1, ROTARY_PIN2);
// Or initialize full step rotary encoder with internal pull-up pins disabled
// and default sensitivity=100
// RotaryFullStep rotary(ROTARY_PIN1, ROTARY_PIN2, false);
// Or initialize full step rotary encoder with internal pull-up pins enabled and
// sensitivity value 1..255
// A higher value is more sensitive
// RotaryFullStep rotary(ROTARY_PIN1, ROTARY_PIN2, true, 200);
// Global variables
// Make count variable volatile, because it is accessed from the main loop as
// well as the interrupt handler
volatile int count = 0;
int countLast = 0;
// Forward declaration
void rotaryInterrupt();
void printCount();
void setup()
{
// Initialize Serial port
Serial.begin(115200);
while (!Serial) {
;
}
Serial.println(F("\nButton example full step Rotary Encoder with interrupts"));
// Enable internal pull-up for the rotary button pin
pinMode(ROTARY_BUTTON_PIN, INPUT_PULLUP);
// Initialize pin change interrupt on both rotary encoder pins
attachInterrupt(digitalPinToInterrupt(ROTARY_PIN1), rotaryInterrupt, CHANGE);
attachInterrupt(digitalPinToInterrupt(ROTARY_PIN2), rotaryInterrupt, CHANGE);
}
void loop()
{
// Poll Rotary button pin
if (digitalRead(ROTARY_BUTTON_PIN) == 0) {
// Reset and print count value when rotary button is down and count > 0
if (count != 0) {
count = 0;
printCount();
}
}
}
#if defined(ARDUINO_ARCH_ESP8266) || defined(ARDUINO_ARCH_ESP32)
ICACHE_RAM_ATTR
#endif
void rotaryInterrupt()
{
int rotaryState;
// Read rotary state (Counter clockwise) -2, -1, 0, 1, 2 (Clockwise)
rotaryState = rotary.read();
// Count up or down by using rotary speed
if (rotaryState == 0) {
// No change
return;
} else if (abs(rotaryState) >= 2) {
count += rotaryState * 2;
} else {
count += rotaryState;
}
// Limit count to a minimum and maximum value
if (count > 100) {
count = 100;
}
if (count < 0) {
count = 0;
}
// Print count value when count value changed
if (countLast != count) {
countLast = count;
printCount();
}
}
void printCount()
{
// Print count value on Serial
Serial.print(F("Count: "));
Serial.println(count);
}