// Arduino Button Library
// https://github.com/JChristensen/JC_Button
// Copyright (C) 2018 by Jack Christensen and licensed under
// GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html
//
// Example sketch that uses both short and long button presses to adjust
// a number up and down, between two limits. Short presses increment
// or decrement by one, long presses repeat at a specified rate.
// Every time the number changes, it is written to the serial monitor.
#include <JC_Button.h> // https://github.com/JChristensen/JC_Button
// pin assignments
const byte
DN_PIN(10), // connect a button switch from this pin to ground
UP_PIN(9); // ditto
Button btnUP(UP_PIN), btnDN(DN_PIN); // define the buttons
const unsigned long
REPEAT_FIRST(500), // ms required before repeating on long press
REPEAT_INCR(100); // repeat interval for long press
const int
MIN_COUNT(0),
MAX_COUNT(59);
void setup()
{
btnUP.begin();
btnDN.begin();
Serial.begin(115200);
}
void loop()
{
static int
count, // the number that is adjusted
lastCount(-1); // previous value of count (initialized to ensure it's different when the sketch starts)
static unsigned long
rpt(REPEAT_FIRST); // a variable time that is used to drive the repeats for long presses
enum states_t {WAIT, INCR, DECR}; // states for the state machine
static states_t STATE; // current state machine state
btnUP.read(); // read the buttons
btnDN.read();
if (count != lastCount) // print the count if it has changed
{
lastCount = count;
Serial.println(count, DEC);
}
switch (STATE)
{
case WAIT: // wait for a button event
if (btnUP.wasPressed())
STATE = INCR;
else if (btnDN.wasPressed())
STATE = DECR;
else if (btnUP.wasReleased()) // reset the long press interval
rpt = REPEAT_FIRST;
else if (btnDN.wasReleased())
rpt = REPEAT_FIRST;
else if (btnUP.pressedFor(rpt)) // check for long press
{
rpt += REPEAT_INCR; // increment the long press interval
STATE = INCR;
}
else if (btnDN.pressedFor(rpt))
{
rpt += REPEAT_INCR;
STATE = DECR;
}
break;
case INCR:
count++; // increment the counter
count = min(count, MAX_COUNT); // but not more than the specified maximum
STATE = WAIT;
break;
case DECR:
count--; // decrement the counter
count = max(count, MIN_COUNT); // but not less than the specified minimum
STATE = WAIT;
break;
}
}