Here is some code that I use to detect button multi click and hold for my arduino project. I'm sure I can make this code tighter so it takes less memory. Any suggestions would be appreciated.
The way the code works is that with each call to checkButton( inputPin )
if the number is greater than 0. Then the result is the number of times the button was clicked ( ie. multi-click)
if the number is less than 0. then the result is the number of times the button was clicked before being held.
here is the code. Enjoy.
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boolean last_button_state[2] = {LOW,LOW};
boolean cur_button_state[2] = {LOW,LOW};
unsigned long holdEventTS[2] = {0,0};
unsigned short holdDelay[2] = {0,0};
unsigned char clickCount[2] = {0,0};
int checkButton( int button, int index ){
unsigned long curEventTS = millis();
int state = 0;
cur_button_state[index] = debounce ( button, last_button_state[index] );
if ( holdEventTS[index] > 0 ){
holdDelay[index] = curEventTS - holdEventTS[index];
}
if ( cur_button_state[index] == HIGH && last_button_state[index] == LOW ){
holdEventTS[index] = curEventTS;
clickCount[index] ++;
}else if ( cur_button_state[index] == LOW && last_button_state[index] == HIGH && holdEventTS[index] == 0){
state = 99;
}
last_button_state[index] = cur_button_state[index];
if ( cur_button_state[index] == LOW && holdDelay[index] > 250 && clickCount[index] > 0){
state = clickCount[index];
holdDelay[index] = clickCount[index] = holdEventTS[index] = 0;
}else if ( cur_button_state[index] == HIGH && holdDelay[index] > 1000 ){
state = -1 * clickCount[index];
holdDelay[index] = clickCount[index] = holdEventTS[index] = 0;
}
return state;
}
boolean debounce ( int button, int curstate ){
boolean state = digitalRead ( button );
if ( state != curstate ){
delay ( 5 );
state = digitalRead ( button );
}
return state;
}
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