Button release condition

Using Arduino Programming Questions
#1

HI ALL

PLEASE TELL ME HOW TO DO A CODING FOR WHEN BUTTON GET OFF OUTPUT (EX LED) GET BLINK 10 SECOND AND OFF. I TRY TO DO A CODE BUT ITS USELESS

SEE MY CODE BELOW.

// set pin numbers:
const int buttonPin = 2; // the number of the pushbutton pin
const int ledPin = 13; // the number of the LED pin

// variables will change:
int buttonState = 0; // variable for reading the pushbutton status

void setup() {
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);
}

void loop() {
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);

// check if the pushbutton is pressed.
// if it is, the buttonState is HIGH:
if (buttonState == HIGH) {
// turn LED on:
digitalWrite(ledPin, HIGH);
} else {
// turn LED off:
digitalWrite(ledPin, LOW);
}
}

#2

Try: pinMode(buttonPin, INPUT_PULLUP);

How do you have your switch wired?

#3

Read: http://www.gammon.com.au/forum/?id=11955

#4

switch GND to pin 2

#5

Your code as is should turn on the LED when HIGH and off when LOW. Does it?

#6

yes correct i need to blink led 10 s and off

#7

Try this very basic sketch:

// set pin numbers:
const int buttonPin = 2;     // the number of the pushbutton pin
const int ledPin =  13;      // the number of the LED pin


// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() 
{
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() 
{
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if (buttonState == LOW) 
  {
    // turn LED on:
    digitalWrite(ledPin, HIGH);
    delay(10000);
    digitalWrite(ledPin, LOW);
  }

} //END of loop()
#8

this is work but my purpose is different. think my door normally it closed. when someone come door reed switch open (open state) then LED ( or a beep) get blinked 10 s and off. but door still open. when he closed the door again arduino should reset and reed switch in closed mode. i want to add TX and RX for this too.

#9

Are you saying when the door is open, the reed is open and pin 2 is HIGH?

You want the LED to turn on for 10 seconds "the moment" the door is open?

#10

when door is open pin 2 on low ( i mean magnet is going away co contact)

below code work but no timer. led blink till the door is close.

// set pin numbers: const int buttonPin = 2; // the number of the pushbutton pin const int ledPin = 13; // the number of the LED pin

// variables will change: int buttonState = 0; // variable for reading the pushbutton status

void setup() { // initialize the LED pin as an output: pinMode(ledPin, OUTPUT); // initialize the pushbutton pin as an input: pinMode(buttonPin, INPUT_PULLUP); }

void loop() { // read the state of the pushbutton value: buttonState = digitalRead(buttonPin);

// check if the pushbutton is pressed. // if it is, the buttonState is HIGH: if (buttonState == HIGH) { // turn LED on: //digitalWrite(ledPin, HIGH);

digitalWrite(13, HIGH); //set pin 13 high (+5V) delay(200); //wait 1000 ms = 1 second digitalWrite(13, LOW); //set pin 13 low (0V) delay(200); // wait 1 second

digitalWrite(ledPin, LOW); // }

} //END of loop()

#11

I am not fully understanding what you need. Try this:

// set pin numbers:
const int buttonPin = 2;     // the number of the pushbutton pin
const int ledPin =  13;      // the number of the LED pin

byte ledState = 0;
unsigned long ledTime;

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() 
{
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() 
{
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if(buttonState == HIGH && ledState == 0) 
  {
    // turn LED on:
    digitalWrite(ledPin, HIGH);
    ledState = 1;
    ledTime = millis();
  }
  
  //if the led is on, is it time to turn it off?
  if(ledState == 1 && millis() - ledTime >= 10000UL)
  {
    // turn LED off:
    digitalWrite(ledPin, LOW);
    //ledState = 0;
  }

  if(buttonState == LOW)
  {
    ledState = 0;
    digitalWrite(ledPin, LOW);
  }

} //END of loop()
#12

i am sorry for bad english. simply here is my situation. i have placed reed switch in my room door. when door is closed. magnet near the reed switch and no alert its a standby. but when door open reed switch contact open (no magnet) then LED should blink 10 second and off. same time i want to send alert to other location via 433MHz tx.

there should be a timer for this right? reed switch open mean my system alerting.

now your code works well but no blinking if it blinking that is perfect.

thank for your kind support

#13

You want the LED to flash on and off several times and do this for 10 seconds?

#14

correct you got it

#15

Try this:

// set pin numbers:
const int buttonPin = 2;     // the number of the pushbutton pin
const int ledPin =  13;      // the number of the LED pin

byte ledFlag = 0;
byte enableFlag = 0; 
unsigned long ledTime;
unsigned long flashTime;
const unsigned long flashRate = 200UL;

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() 
{
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() 
{
  buttonState = digitalRead(buttonPin);

  if(buttonState == HIGH && ledFlag == 0) 
  {
    digitalWrite(ledPin, HIGH);
    ledFlag = 1;
    enableFlag = 1;
    ledTime = millis();
    flashTime = millis();
  }
  
  if(enableFlag == 1 && millis() - ledTime <= 10000UL)
  {
    if(millis() - flashTime >= flashRate)
    {
      flashTime = millis();
      digitalWrite(ledPin, !digitalRead(ledPin));
    }
  }
  else
  {
    enableFlag = 0;
    digitalWrite(ledPin, LOW);
  }

  if(buttonState == LOW)
  {
    ledFlag = 0;
    enableFlag = 0;
    digitalWrite(ledPin, LOW);
  }

} //END of loop()

EDIT:
Updated code with enableFlag

#16

Thank you Mr Larry your a genius

#17

Do you understand what each line of code does in the sketch from post #14?

#18

yes i understood the flag. and all. now im trying to burn this to tiny85. ok tiny85 has 8 pin now in my sketch there are one input and one output. how i burn boot loader.

In future i want to add TX and RX to this. when LED trigger TX send signal to RX so can i use tiny85 to this or a need to buy another chip. i mean 8 pin enough for t his??? thank for supporting

#19