How to control the switch to light a small bulb in the specific press order?

can led toggle on , off each press of switch? is, first time press switch, led turns on, second time press switch turns off, , on?



ps. read debounce example, confused it. should use debounce function deal this, think not time interval.

code: [select]

void setup() { pinmode(led_builtin, output);
pinmode(2, input); }
void loop() {
int switchvalue = digitalread(2);
if (switchvalue == high) {
digitalwrite(led_builtin, high); }
else {
digitalwrite(led_builtin, low); }
delay(10); }

the state change detection example is, think, looking for.  in ide go file, examples, digital.  using can toggle led each time button becomes pressed (as opposed pressed).

i modified state change detection example show how toggle on-board led push buttonn switch.  changed switch wiring wired ground , internal pullup.  see comments in code.

code: [select]

/*
  state change detection (edge detection)

  often, don't need know state of digital input time,
  need know when input changes 1 state another.
  example, want know when button goes off on.  called
  state change detection, or edge detection.

  example shows how detect when button or button changes off on
  , on off.  no debounce required case.

  circuit:
   pushbutton attached pin 2 ground
   internal pullup resistor on pin 2 enabled
   led attached pin 13 ground (or use built-in led on
   most arduino boards)

  created  27 sep 2005
  modified 30 aug 2011
  tom igoe

  example code in public domain.

  http://www.arduino.cc/en/tutorial/buttonstatechange

*/

// constant won't change:
const int  buttonpin = 2;    // pin pushbutton attached to
const int ledpin = 13;       // pin led attached to

// variables change:
int buttonstate = 0;         // current state of button
int lastbuttonstate = 0;     // previous state of button

void setup()
{
  // initialize button pin input internal pullup enabled
  pinmode(buttonpin, input_pullup);
  // initialize led output:
  pinmode(ledpin, output);
  // initialize serial communication:
  serial.begin(9600);
}


void loop()
{
  // read pushbutton input pin:
  buttonstate = digitalread(buttonpin);
  // compare buttonstate previous state
  if (buttonstate != lastbuttonstate)
  {
    // if state has changed, increment counter
    if (buttonstate == low)
    {
      // if current state low button
      // went off on:
      serial.println("on");
      digitalwrite(ledpin, !digitalread(ledpin));  // toggle led
    }
    else
    {
      // if current state low button
      // wend on off:
      serial.println("off");
    }
    // delay little bit avoid bouncing
    delay(50);
  }
  // save current state last state,
  //for next time through loop
  lastbuttonstate = buttonstate;
}

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