How do I make the LEDs stay on after pressing a switch? then stay off when the switch is pressed succeeding the last

Projects Programming
1

How do I make the LEDs stay and continue in a loop after I press the switch once, and turn off when the switch is pressed again? This is the code I have so far but it only allows the LEDs to light up when I hold onto pressing the switch and turn back off immediately after I release it. If anybody knows how to help going from here that would be great, thank you ^-^

int button1 = 2; //tact switch connected to digital pin 2
int LED = 4; //blue LED
int button2 = 7; //tact switch connected to digital pin 7
int LED2 = 9; //yellow LED

void setup() {
  pinMode(2, INPUT);
  pinMode(4, OUTPUT);
  pinMode(7, INPUT);
  pinMode(9, OUTPUT);
  
}

void loop() {
  if (digitalRead (button1)==HIGH) {
    digitalWrite (LED, HIGH);
  }
  else {
    digitalWrite (LED, LOW);
  }
{
  if (digitalRead (button2)==HIGH) {
    digitalWrite (LED2, HIGH);
  }
  else {
    digitalWrite (LED2, LOW);
  }
}
}

edit: I fixed the variables for the tact switch

2

bool tick = true;

not tested.

3

You need to detect when the button becomes pressed rather than when it is pressed

See the StateChangeDetection example in the IDE

4
5

Hello
Your sketch will not compile.

p.s. Do you have coding experience in C++.

6

Your code won't even compile. "switch" is a statement (switch..case) and can't be a variable.

7

Hello
Try this sketch to study digital.Read() and digital.Write() .
I´m assuming the switches are connected correct.

  int switch1 = 2; //tact switch connected to digital pin 2  
  int LED1 = 4; //blue LED
  int switch2 = 7;//tact switch connected to digital pin 7 
  int LED2 = 9; //yellow LED

void setup() {
  pinMode(switch1 , INPUT);
  pinMode(LED1 , OUTPUT);
  pinMode(switch2, INPUT);
  pinMode(LED2, OUTPUT);
}
void loop() {
  digitalWrite (LED1, digitalRead (switch1));
  digitalWrite (LED2, digitalRead (switch2));
}

Have a nice day and enjoy coding in C++.
p.s. This is a nice task to start with OOP.

1 Like
8 
// This a simple OOP example to toggle LEDs, keep in mind to connection of the hardware 
// The sketch is tested using my test enviromnet and the initialization may has to be changed

// declare an object 
struct LEDBUTTON {
  byte switchPin;               // [port pin] ----- [switch] ------ [gnd]
  byte ledPin;                  // [port pin] -----  [led]   ------ [gnd]
  byte counter;                 // counter to toggle led
  int statusQuo;                // old switch state
};
// initialize an array using the object declaration
LEDBUTTON ledButtons[] { // add switch and led combinatios as you like simply 
  {A0, 3, 0,false},
  {A1, 5, 0,false},
  {A2, 6, 0,false},
  {A3, 7, 0,false},
};

void setup() {
  // the "range based for loop" will save typing work :) 
  for (auto &ledButton : ledButtons) {
    pinMode (ledButton.switchPin, INPUT_PULLUP);
    pinMode (ledButton.ledPin, OUTPUT);
  }
}
void loop() {
  delay (20);                 // dirty debouncing
   // the "range based for loop" will save typing work :) 
  for (auto &ledButton : ledButtons) { 
    // read button state 
    int stateNew = !digitalRead(ledButton.switchPin);
    // any changes ?
    if (ledButton.statusQuo != stateNew) {
      // save state 
      ledButton.statusQuo = stateNew;
      // if button is pressed, than toogle led on/off vs off/on
      if (stateNew) digitalWrite(ledButton.ledPin, ++ledButton.counter & 1);
    }
  }
}
1 Like
9

Ah yeah i've noticed that just now. As for C++, I've one heard of it and used it only a couple of times before but under instructions and tutorials.

10

Thank you, I'll be sure to keep those in mind! :DD

11

Hello
Many thanks for your reply.
You may use the sketch as starter for the coding in C++.

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

12

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