6 buttons and analog pin


hello everybody. i'm using a5 read presses of 6 buttons , printing pressed. problem program registrates 1 press of button couple of presses. press first button twice, program print number 1 (first button) 3 or 4 times. suppose should debounced, don't know how on analog pin. on picture, buttons go 1 6 right left.

code: [select]
 
int old_button = 0;
int button;
int pressed_button;
int z;

void setup () {
  pinmode(a5, input);
  serial.begin(9600);
}

void loop () {
  z = analogread(a5);
  if (z > 1021) button = 0;                                           
  else if (z > 511 && z < 514) button = 1;                     
  else if (z > 680 && z < 684) button = 2;               
  else if (z > 766 && z < 770) button = 3;               
  else if (z > 817 && z < 822) button = 4;             
  else if (z > 851 && z < 856) button = 5;
  else if (z > 875 && z < 880) button = 6;
  else button = 0;                                                     
   
  if (old_button == button) {                                                                                       
    pressed_button = 0;                                               
  } 
 
  else {                                                               
    old_button = button;                                             
    pressed_button = button;                                       
  }

  serial.println(pressed_button);
}

you have no delay in sketch, loop() delayed serial.println().

you add timing , debounce that, using analog input makes harder.
what if delay() after button pressed. quick , dirty, might little.

code: [select]

....
else button = 0;                                                     
   
if (button != 0)
  delay( 20);

  if (old_button == button) { 
....



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