88 lines
4.0 KiB
C++
88 lines
4.0 KiB
C++
/*----------------------------------------------------------------------*
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* Example sketch for Arduino Button Library by Jack Christensen *
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* *
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* An example 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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* *
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* This work is licensed under the Creative Commons Attribution- *
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* ShareAlike 3.0 Unported License. To view a copy of this license, *
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* visit http://creativecommons.org/licenses/by-sa/3.0/ or send a *
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* letter to Creative Commons, 171 Second Street, Suite 300, *
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* San Francisco, California, 94105, USA. *
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*----------------------------------------------------------------------*/
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#include <JC_Button.h> //https://github.com/JChristensen/JC_Button
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#define DN_PIN 7 //Connect two tactile button switches (or something similar)
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#define UP_PIN 8 //from Arduino pin 7 to ground and from pin 8 to ground.
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#define PULLUP true //To keep things simple, we use the Arduino's internal pullup resistor.
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#define INVERT true //Since the pullup resistor will keep the pin high unless the
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//switch is closed, this is negative logic, i.e. a high state
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//means the button is NOT pressed. (Assuming a normally open switch.)
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#define DEBOUNCE_MS 25 //A debounce time of 20 milliseconds usually works well for tactile button switches.
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#define REPEAT_FIRST 500 //ms required before repeating on long press
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#define REPEAT_INCR 100 //repeat interval for long press
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#define MIN_COUNT 0
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#define MAX_COUNT 59
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Button btnUP(UP_PIN, PULLUP, INVERT, DEBOUNCE_MS); //Define the buttons
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Button btnDN(DN_PIN, PULLUP, INVERT, DEBOUNCE_MS);
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enum {WAIT, INCR, DECR}; //The possible states for the state machine
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uint8_t STATE; //The current state machine state
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int count; //The number that is adjusted
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int lastCount = -1; //Previous value of count (initialized to ensure it's different when the sketch starts)
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unsigned long rpt = REPEAT_FIRST; //A variable time that is used to drive the repeats for long presses
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void setup()
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{
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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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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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lastCount = count;
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Serial.println(count, DEC);
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}
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switch (STATE) {
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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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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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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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