Button control cycle

Using Arduino Programming Questions
1

Hello,

Pretty new to Arduino. I'm trying to control relays and LEDs with a button. I am able to turn the relays on/off with a button using this code:

/*

*/

const int buttonPin = 3;
const int relay = 13;
const int relayMist = 12;
const int Greenled = 1;
const int Blueled = 2;

int buttonPushCounter = 0;
int buttonState = 0;
int lastButtonState = 0;

void setup() {

pinMode(buttonPin, INPUT);
pinMode(Greenled, OUTPUT);
pinMode(Blueled, OUTPUT);
pinMode(relay, OUTPUT);
pinMode(relayMist, OUTPUT);
Serial.begin(9600);
}

buttonState = digitalRead(buttonPin);

if (buttonState != lastButtonState) {

if (buttonState == HIGH) {

buttonPushCounter++;
Serial.println("on");
Serial.print("number of button pushes: ");
Serial.println(buttonPushCounter);
}
else {

Serial.println("off");
}
}

lastButtonState = buttonState;

if (buttonPushCounter % 2 == 0) {
digitalWrite(Greenled, LOW);
digitalWrite(relay, HIGH);
digitalWrite(relayMist, HIGH);
digitalWrite(Blueled, HIGH);

} else {
digitalWrite(Greenled, HIGH);
digitalWrite(relay, LOW);
digitalWrite(relayMist, LOW);
digitalWrite(Blueled, LOW);

}

What I want to do is have the relays turn on after the button is pressed then turn off after 15 seconds. Anyone know how I can do this? Any help would be great!

2

Anyone know how I can do this?

After the switch is pressed? Or after it is released?

Why are you counting presses?

Turning a pin on and off after a delay() is trivial. Turning it on, and then using the blink without delay philosophy (check whether it is time to do something) to turn it off is only slightly (very slightly) more challenging.

3

Thanks for the response. I have the button counter because it was the first way I was able to get the relays to turn on and off by the button. Ideally, I would like to push the button, release it, then have the cycle start and end after 15 seconds.

I think I need to change the code to something more like when button input goes from low to high to low, then:

digitalWrite(Greenled, HIGH);
digitalWrite(relay, LOW);
digitalWrite(relayMist, LOW);
digitalWrite(Blueled, LOW);
delay(15000)
digitalWrite(Greenled, LOW);
digitalWrite(relay, HIGH);
digitalWrite(relayMist, HIGH);
digitalWrite(Blueled, HIGH);

I'm unsure how to write the first part. Any samples of code similar to this would be great!

4

You must follow this tutorial for the button control:

I wrote this code, try it:

const int  buttonPin = 3;  
const int relay = 13; 
const int relayMist = 12;
const int Greenled = 1;
const int Blueled = 2;
  
int buttonState;             
int lastButtonState = LOW;   
unsigned long lastDebounceTime = 0;  
long debounceDelay = 50;  


void setup() {                

  pinMode(buttonPin, INPUT);
  pinMode(Greenled, OUTPUT); 
  pinMode(Blueled, OUTPUT); 
  pinMode(relay, OUTPUT); 
  pinMode(relayMist, OUTPUT); 
  Serial.begin(9600);
  digitalWrite(Greenled, LOW);   
  digitalWrite(relay, HIGH);
  digitalWrite(relayMist, HIGH);
  digitalWrite(Blueled, HIGH);
}

 void loop() {
   int reading = digitalRead(buttonPin); 
   if (reading != lastButtonState) 
    lastDebounceTime = millis();
    if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;
      if (buttonState == HIGH) {
        while (digitalRead(buttonPin) == HIGH) {}
        Blinking();
      }
    }
  }
  lastButtonState = reading;
 }
  
void Blinking() {
  digitalWrite(Greenled, HIGH);   
  digitalWrite(relay, LOW); 
  digitalWrite(relayMist, LOW);  
  digitalWrite(Blueled, LOW);
  delay(15000);
  digitalWrite(Greenled, LOW);   
  digitalWrite(relay, HIGH);
  digitalWrite(relayMist, HIGH);
  digitalWrite(Blueled, HIGH);
}
5

Wow thank you! This is exactly what I needed. I really appreciate it!

6

You're welcome :wink: but you must study the tutorial of the debounce! It's important for the buttons control!

7

I definitely will. I was looking into that earlier. Thanks again!