Programming my desired function to my Arduino

Using Arduino Project Guidance
1

I want to have a program that when I press the push button my LED should turn on and if I press the button again twice my LED should turn off, can someone help me create this program on my arduino?

2

The State Change Detect example in the ide (file > examples > 2 digital) and here would be a good place to start. It counts button presses... You could probably adapt it so the press #1 turns on the led, and #3 turns it off. Then reset the counter so the 4th press is a new #1.

Have a think about that.

3

@newbie19, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project :wink: See About the Installation & Troubleshooting category.

You will need to study the state change detection example that comes with the IDE. When a button becomes pressed, you switch the led on, when it becomes pressed again it switches off.

It's a little more complicated than above as you want two presses to switch it off so you need to keep a counter that you set to 0 when the LED is switched on, increment when the LED is on and the state change is detected and only switch the LED of if the count reaches 2.

4

sterretje and I provided similar suggestions. But you also need to clarify if "press the button again twice" means 2 presses a week apart of if you mean the more traditional double-click like on a mouse. In the latter case you need to start a timer so that if the double click is too slow it doesn't register as a double click. There are a number of libraries that take care of that under the hood.

5

Given that this is clearly a bit of homework, I don't expect anyone to give you working code for this. But you can post your attempts if you get stuck for help.

6

Hello
Check out this sketch. The sketch is using an array to collect all relevant information like pin addresses, states and times. Inside the loop() a button debouncing, state change detection and led action will take place on this information.

/* BLOCK COMMENT
  ATTENTION: This Sketch contains elements of C++.
  https://www.learncpp.com/cpp-tutorial/
  https://forum.arduino.cc/t/programming-my-desired-function-to-my-arduino/927984
*/
#define ProjectName "Programming my desired function to my Arduino"
// HARDWARE SETTINGS
// YOU MAY NEED TO CHANGE THESE CONSTANTS TO YOUR HARDWARE AND NEEDS
constexpr byte ButtonPin {A0};      // portPin o---|button|---GND
constexpr byte Led1Pin {3};         // portPin o---|220|---|LED|---GND
#define OutPutTest
// CONSTANT DEFINITION
enum {Button_};
enum {Led1};
enum {One};
constexpr byte Input_[] {ButtonPin};
constexpr byte Output_[] {Led1Pin};
constexpr  unsigned long OutPutTestTime {1000};
// VARIABLE DECLARATION AND DEFINITION
unsigned long currentTime;
struct TOOGLEBUTTON {
  byte pin;
  bool statusQuo;
  byte led ;
  unsigned long stamp;
  unsigned long duration;
} toogleButton {Input_[Button_], false, Output_[Led1], 0, 20};
// -------------------------------------------------------------------
void setup() {
  Serial.begin(9600);
  Serial.println(F("."));
  Serial.print(F("File   : ")), Serial.println(__FILE__);
  Serial.print(F("Date   : ")), Serial.println(__DATE__);
  Serial.print(F("Project: ")), Serial.println(ProjectName);
  pinMode (LED_BUILTIN, OUTPUT);  // used as heartbeat indicator
  //  https://www.learncpp.com/cpp-tutorial/for-each-loops/
  for (auto Input : Input_) pinMode(Input, INPUT_PULLUP);
  for (auto Output : Output_) pinMode(Output, OUTPUT);
#ifdef OutPutTest
  // check outputs
  for (auto Output : Output_) digitalWrite(Output, HIGH), delay(OutPutTestTime);
  for (auto Output : Output_) digitalWrite(Output, LOW), delay(OutPutTestTime);
#endif
}
void loop () {
  currentTime = millis();
  digitalWrite(LED_BUILTIN, (currentTime / 500) % 2);
  // debounce button
  if (currentTime - toogleButton.stamp >= toogleButton.duration) {
    toogleButton.stamp = currentTime;
    // check state change
    bool stateNew = !digitalRead(toogleButton.pin);
    if (toogleButton.statusQuo != stateNew) {
      toogleButton.statusQuo = stateNew;
      // take action on change
      if (stateNew) {
        digitalWrite(toogleButton.led, !digitalRead(toogleButton.led));
      }
    }
  }
}

Have a nice day and enjoy coding in C++.

7

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