Brand new to this stuff (kinda)

Projects Programming
1

I used to program in college but that was 20 years ago now and I am back to basics. I am trying to figure out how to add a button to this code to control it. Once pressed I want it to only run once, and then stop. I have looked at other examples but I am either not integrating it right or I'm botching it on the breadboard. Any assistance would be appreciated.

CODE

/*
Fade

This example shows how to fade an LED on pin 9
using the analogWrite() function.

This example code is in the public domain.
*/

int led = 9; // the pin that the LED is attached to
int brightness = 0; // how bright the LED is
int fadeAmount = 5; // how many points to fade the LED by

// the setup routine runs once when you press reset:
void setup() {
// declare pin 9 to be an output:
pinMode(led, OUTPUT);
Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
// set the brightness of pin 9:
analogWrite(led, brightness);

// change the brightness for next time through the loop:
brightness = brightness + fadeAmount;

// check to see if we are ready for flash
if (brightness > 150) {
// flash the led
analogWrite(led, 255);
delay(50);
// start the dimming effect
fadeAmount = -fadeAmount ;
Serial.println(brightness);
}
if (brightness <= 0) {
fadeAmount = -fadeAmount;
}

// wait for 30 milliseconds to see the dimming effect
delay(30);
}

2

Take a look at the state change example in the IDE's code examples.

Please remember to use code tags when posting code.

3

Sorry, again, new.... :frowning: I will delete

4

Goodbye. Deleted profile. Sorry to have bothered anyone.

5

jamstraz:
Goodbye. Deleted profile. Sorry to have bothered anyone.

Wow.

6

jamstraz:
Goodbye. Deleted profile. Sorry to have bothered anyone.

From introduction to opus in three posts. That's gotta be a new record.

7

jamstraz:
Goodbye. Deleted profile. Sorry to have bothered anyone.

I don't know if the deletion is automatic or it needs intervention/approval of the Moderator. In the past, I tried to delete my profile; but, it was never deleted. I think that you are still alive in the Forum and just continue.

Here, how you can go connecting a button with your sketch, which when pressed will cause your sketch to run only once.

1. Connect K1 with DPin-2 (with internal pull-up enabled) as per Fig-1.
led1sw1.png
Figure-1:

2. Upload the following sketch (tested).

int led = 9;           // the pin that the LED is attached to
int brightness = 0;    // how bright the LED is
int fadeAmount = 5;    // how many points to fade the LED by
int counter = 0;
// the setup routine runs once when you press reset:
void setup()
{
  // declare pin 9 to be an output:
  // pinMode(led, OUTPUT);
  pinMode(2, INPUT_PULLUP);    //internal pull-up resistor is connected
  Serial.begin(9600);
}

void loop()
{
  while (digitalRead(2) != LOW)  //check if the button is pressed; if not wait until closed
    ;
  counter = 0;
  do
  {
    // set the brightness of pin 9:
    analogWrite(led, brightness);

    // change the brightness for next time through the loop:
    brightness = brightness + fadeAmount;

    // check to see if we are ready for flash
    if (brightness > 150)
    {
      // flash the led
      analogWrite(led, 255);
      delay(50);
      // start the dimming effect
      fadeAmount = -fadeAmount ;
      Serial.println(brightness);

    }
    if (brightness <= 0)
    {
      fadeAmount = -fadeAmount;
      counter++;
    }

    // wait for 30 milliseconds to see the dimming effect
    delay(30);
  }
  while (counter != 1);
}

3. Just press K1 and check the fading effect on the LED for one cycle.

4. Once the process is stopped repeat Step-3.

led1sw1.png