Need help with Countdown timer Project

Projects Programming
1

hello my friends,
my name is Ahmed Darwish. this is my first arduino program.

i want to make a countdown system for irrigation control.

the system goes as follows:

  • the system is turned on.
  • the system asks me to enter the time for countdown as hh:mm:ss
  • i enter the values with keypad (4:3 or 4:4)
  • i press # to enter the values to the memory
  • the system asks me to enter the signal period as mm:ss
  • i enter the values with keypad (4:3 or 4:4)
  • i press # to enter the values to the memory
  • the system starts to count down from hh:mm:ss i entered to 00:00:00
  • the system starts to create a HIGH signal to control a relay for signal period mm:ss
  • the system starts to count down from mm:ss i entered to 00:00
  • the system makes a LOW signal to control a relay
  • the system repeats to countdown hh:mm:ss again then signal period mm:ss over and over
  • if i press the * any time the system resets

i got a code from:
http://tech-zen.tv/episodes/shows/make-it-work/episodes/countdown-timer-with-an-arduino-episode-42

i modified it, but could not complete the code. attached a file with the code

Can you help me to modify it .. please.

thanks alot

Countdown.txt (4 KB)

2

Please stop cross-posting. Other thread removed.

3

Note: you can post your code in the thread itself using code tabs. Just press the button which looks like </> and it will put in some tags for you. Then you can put your code in here and it will look like this:

Hello!

When you say 'modify' what do you want it to do exactly?

4

Sporech:
When you say 'modify' what do you want it to do exactly?

Actually, he told us. Add the posted list of features to the online code.

5

Well, there's a lot there. The basic sketch is

loop() {
  if(im in time enter mode) {
    do time enter thing
  }
  else {
    do countdown thing
  }
}

the countdown thing is reasonably simple.

void do countdown thing() {
  if * is pressed {
    turn everything off
    go back to time enter mode
    return
  }

  if time - start time < initial delay {
    turn output off
    if time is different to time last time I last executed this loop {
      update countdown display
    }
  } else if time - start time < initial delay + signal period {
    turn output on
    if time is different to time last time I last executed this loop {
      update countdown display
    }
  } else {
    set  start time to right now
  }
}

The inputty thing is the most complicated bit. You'll want to break it up into "work out if there's been a keypress" and "do something with the key press" this means keeping track of which particular number is being input.