Countdown timer sketch

Using Arduino Programming Questions
1

Can anyone help me with my project. I am building a countdown timer using push button and RTC
. When I push the button it will trigger the relay on, then stop after 6hours

2

@kingjohn, you just hijacked someone elses thread. That is not allowed. Please start your own separate thread. I strongly suggest you read the forum guidelines.

3

Split from an unconnected topic

4

What have you tried so far? Do you have any hardware? Have you written any code? Please provide details.

5

What do you mean by "help"? We will help with code you have written. We will not write code for you.

6

@kingjohn13

What you got so far code ? breadboard circuit ? RTC module ?

Well it look simple ... Need .. push button switch, led ( that will be the relay ) resistor 1 K , 330. A RTC ( any type ) <-- an RTC is optional. Need precise to the second , yes an RTC will be use. if not, a count cycle will work.

psudo code
start : begin
Check button if press 
No - go begin
Yes - go countdown
countdowm :
turn on led - relay
count up to 216000 for 1 second
turn off led ( relay )
go begin

To calculate the final number ( the silly number ) 6 hr -> 360 min -> 216000 sec.

That work if the code just wait for 6 hours doing nothing.
By thinking about it, the code is simple.

byte button_pin = 2; 
byte relay_pin = 3;
boolean button_state;
unsigned long time_waiting = 216000;

void setup ()
{
   pinMode(button_pin, OUTPUT);
   pinMode(relay_pin, OUTPUT);
}

void loop()
{
    button_state = digitalRead(button_pin);
    if (button_state == false)
// entering a VERY LONG LOOP
   {
       digitalWrite(relay_pin, HIGH);
       for (unsigned long x=0; x<time_waiting;x++)
       {
           delay(1000);
       }
       digitalWrite(relay_pin, LOW);
   }
}

No RTC is needed. BUT if you want the Arduino do something during the 6 hours waiting, well you did not mention that extra detail.

7

It would be useful to know WHY you want to do this;

and how you expect the timer to cope with other conditions;
eg if the button is pressed again during the 6 hours of inactivity.

and if you will somehow signal the device is active, or the countdown cycle is progressing.

8

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