88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
// Arduino Button Library
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// https://github.com/JChristensen/JC_Button
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// Copyright (C) 2018 by Jack Christensen and licensed under
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// GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html
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//
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// Example sketch that uses both short and long button presses to adjust
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// a number up and down, between two limits. Short presses increment
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// or decrement by one, long presses repeat at a specified rate.
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// Every time the number changes, it is written to the serial monitor.
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#include <JC_Button.h> // https://github.com/JChristensen/JC_Button
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// pin assignments
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const byte
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DN_PIN(7), // connect a button switch from this pin to ground
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UP_PIN(8); // ditto
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Button btnUP(UP_PIN), btnDN(DN_PIN); // define the buttons
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const unsigned long
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REPEAT_FIRST(500), // ms required before repeating on long press
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REPEAT_INCR(100); // repeat interval for long press
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const int
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MIN_COUNT(0),
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MAX_COUNT(59);
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void setup()
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{
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btnUP.begin();
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btnDN.begin();
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Serial.begin(115200);
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}
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void loop()
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{
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static int
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count, // the number that is adjusted
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lastCount(-1); // previous value of count (initialized to ensure it's different when the sketch starts)
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static unsigned long
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rpt(REPEAT_FIRST); // a variable time that is used to drive the repeats for long presses
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enum states_t {WAIT, INCR, DECR}; // states for the state machine
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static states_t STATE; // current state machine state
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btnUP.read(); // read the buttons
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btnDN.read();
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if (count != lastCount) // print the count if it has changed
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{
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lastCount = count;
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Serial.println(count, DEC);
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}
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switch (STATE)
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{
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case WAIT: // wait for a button event
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if (btnUP.wasPressed())
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STATE = INCR;
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else if (btnDN.wasPressed())
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STATE = DECR;
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else if (btnUP.wasReleased()) // reset the long press interval
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rpt = REPEAT_FIRST;
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else if (btnDN.wasReleased())
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rpt = REPEAT_FIRST;
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else if (btnUP.pressedFor(rpt)) // check for long press
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{
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rpt += REPEAT_INCR; // increment the long press interval
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STATE = INCR;
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}
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else if (btnDN.pressedFor(rpt))
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{
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rpt += REPEAT_INCR;
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STATE = DECR;
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}
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break;
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case INCR: // increment the counter
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count = min(count++, MAX_COUNT); // but not more than the specified maximum
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STATE = WAIT;
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break;
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case DECR: // decrement the counter
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count = max(count--, MIN_COUNT); // but not less than the specified minimum
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STATE = WAIT;
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break;
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}
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}
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