Working through some button troubles and came across this old blog post from 2009 from LadyAda about debouncing several buttons.
But when I copy and pasted into my IDE 1.0.5, lots of errors starting flying. Was wondering if you had a newer version or could tell me why I'm getting the errors.
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#define DEBOUNCE 10 // button debouncer, how many ms to debounce, 5+ ms is usually plenty
// here is where we define the buttons that we'll use. button "1" is the first, button "6" is the 6th, etc
byte buttons[] = {14, 15, 16, 17, 18, 19}; // the analog 0-5 pins are also known as 14-19
// This handy macro lets us determine how big the array up above is, by checking the size
#define NUMBUTTONS sizeof(buttons)
// we will track if a button is just pressed, just released, or 'currently pressed'
volatile byte pressed[NUMBUTTONS], justpressed[NUMBUTTONS], justreleased[NUMBUTTONS];
void setup() {
byte i;
// set up serial port
Serial.begin(9600);
Serial.print("Button checker with ");
Serial.print(NUMBUTTONS, DEC);
Serial.println(" buttons");
// pin13 LED
pinMode(13, OUTPUT);
// Make input & enable pull-up resistors on switch pins
for (i=0; ipinMode(buttons[i], INPUT);
digitalWrite(buttons[i], HIGH);
}
// Run timer2 interrupt every 15 ms
TCCR2A = 0;
TCCR2B = 1<<CS22 | 1<<CS21 | 1<<CS20;
//Timer2 Overflow Interrupt Enable
TIMSK2 |= 1<<TOIE2;
}
SIGNAL(TIMER2_OVF_vect) {
check_switches();
}
void check_switches()
{
static byte previousstate[NUMBUTTONS];
static byte currentstate[NUMBUTTONS];
static long lasttime;
byte index;
if (millis() // we wrapped around, lets just try again
lasttime = millis();
}
if ((lasttime + DEBOUNCE) > millis()) {
// not enough time has passed to debounce
return;
}
// ok we have waited DEBOUNCE milliseconds, lets reset the timer
lasttime = millis();
for (index = 0; index digitalRead(buttons[index]); // read the button
/*
Serial.print(index, DEC);
Serial.print(": cstate=");
Serial.print(currentstate[index], DEC);
Serial.print(", pstate=");
Serial.print(previousstate[index], DEC);
Serial.print(", press=");
*/
if (currentstate[index] == previousstate[index]) {
if ((pressed[index] == LOW) && (currentstate[index] == LOW)) {
// just pressed
justpressed[index] = 1;
}
else if ((pressed[index] == HIGH) && (currentstate[index] == HIGH)) {
// just released
justreleased[index] = 1;
}
pressed[index] = !currentstate[index]; // remember, digital HIGH means NOT pressed
}
//Serial.println(pressed[index], DEC);
previousstate[index] = currentstate[index]; // keep a running tally of the buttons
}
}
void loop() {
for (byte i = 0; i if (justpressed[i]) {
justpressed[i] = 0;
Serial.print(i, DEC);
Serial.println(" Just pressed");
// remember, check_switches() will CLEAR the 'just pressed' flag
}
if (justreleased[i]) {
justreleased[i] = 0;
Serial.print(i, DEC);
Serial.println(" Just released");
// remember, check_switches() will CLEAR the 'just pressed' flag
}
if (pressed[i]) {
Serial.print(i, DEC);
Serial.println(" pressed");
// is the button pressed down at this moment
}
}
}
if (millis() < lasttime){
but that didn't solve all the problems. Any help would be appreciated.
Thanks.
Tim