Time Lock (Countdown Timer)

Ok hello there

I have been attempting to program a time lock for my vault in minecraft. I can barely program a password protected door, actually let me restate that: I CAN'T! I want this program to first write <Insert Keycards> on 3 monitors connect to each other. Then the computer receives a redstone pulse from my AND gate which is hooked up to 2 mag-card readers (Immibis Core mod). Then after this pulse the clock starts to countdown from 3:00 to 0:00(all displayed on a monitor centered on the screen) then outputs a redstone pulse from the back of the computer to open the vault. I want there to be a ":" separating the minutes from the seconds which complicates things a lot. And of course that to be on a monitor I wanted to also include a restart of the time lock triggered by a redstone pulse and then restart the program. The error is about an end supposed the while statement before i start any of the else if statements, but the problem is that I want this loop to include all the else if statements. It is a bit repetitive. Here is what I came up with:



local monitor = peripheral.wrap("bottom")
monitor.setTextScale(1.5)
monitor.setCursorPos(2,2)
monitor.write("<Insert Keycards>")

os.pullEvent("redstone")

monitor.clear()
monitor.setTextScale(1.5)
monitor.setCursorPos(1,2)
monitor.write("3:00")

m = 2 – minutes
s = 59 – seconds

while m ~= 0 and s ~= 0 do

elseif s == 0 then
sleep(1) – 1 second pause
m = m-1
s = 59
monitor.clear()
monitor.setTextScale(1.5)
monitor.setCursorPos(1,2)
monitor.write(m,":",s)

elseif s < 10 then
sleep(1)
s = s - 1
monitor.clear()
monitor.setTextScale(1.5)
monitor.setCursorPos(1,2)
monitor.write(m,":0",s)

elseif s < 60 then
sleep(1)
s = s - 1
monitor.clear()
monitor.setTextScale(1.5)
monitor.setCursorPos(1,2)
end


monitor.clear()
monitor.setTextScale(1.5)
monitor.setCursorPos(1,2)
monitor.write("0:00")
sleep(3)
rs.setOutput("back, true")
sleep(20)
rs,setOutput("back, false")
os.reboot() – end of the program



P.S. - I tried to gather as much information on how to make a countdown timer and this is what I come up with

Alright so basically you're creating a counter right? well you can do

for a = 59, 0, -1 do
  print(a)
  sleep(1)
end

This will count from 59 until it hits zero by subtracting one every time it loops. The syntax of the for loop is

for [starting number],[ending number],[increment] do

Now there are other things a for loop can do, however that's the basis of this one and you can even use input from somewhere else by doing

local s = read()
local n = tonumber(s)
for a = n, 0, -1 do
  print(a)
  sleep(1)
end

Which will read what someone inputs, and then start on that number. If you need minutes and seconds, you can easily stack the for loops like so.

for m = 2, 0, -1 do
  for s = 59, 0, -1 do
	print(m..s)
	sleep(1)
  end
end

Which will after every 60 seconds, lower down the minutes, now i understand that you need it to show it with two digits such as 01 or 23 which is actually easy and was shown on an ask a pro earlier(it got moved to general for program request) asking for a count UP timer.

for minutes = 2, 0, -1 do
  for seconds = 59, 0, -1 do
	print((minutes < 10 and "0"..minutes or minutes)..":"..(seconds < 10 and "0"..seconds or seconds))
	sleep(1)
  end
end

This would print out 02:59 for the first time and then it would go 02:09 when it went down that far until it hit 02:00 and then it would go 01:59 and so on and so forth.
Credit to Cranium for this.
The beauty of this is that when minutes is 0 and seconds is 0 then it stops and leaves both loops.

Also i don't know if you need to keep setting the text size on monitors after clearing them, i believe they keep that setting.

Ok so using your help I came up with this program for the countdown time lock



local monitor = peripheral.wrap ("bottom")
monitor.setTextScale(2)
monitor.setCursorPOS(2,2)
monitor.write("<Insert Keycards>")

os.pullEvent("redstone")

monitor.setTextScale(3.5)
monitor.setCursorPos(3,1)
monitor.write("3:00")


for minutes = 2, 0, -1 do
for seconds = 59, 0, -1 do
monitor.clear
monitor.write((minutes < 10 and "0"..minutes or minutes)..":"..(seconds < 10 and "0"..seconds or seconds))
end

end


monitor.clear
monitor.write("00:00")
sleep(3)
rs.setOutput("left, true")
sleep(10)
rs.setOutput("left, false")
os.reboot


There is an error that says it expects an "=" on line 16
I have no idea what is wrong. Please help!!!

monitor.clear

That's your error, same with

os.reboot

They are functions and as such need () such as

monitor.clear()
os.reboot()

if you don't have the () then it thinks it's a variable that you're trying to make and that's why it needs an =

ALSO

for minutes = 2, 0, -1 do
  for seconds = 59, 0, -1 do
	monitor.clear
	monitor.write((minutes < 10 and "0"..minutes or minutes)..":"..(seconds < 10 and "0"..seconds or seconds))
  end
end

is just going to loop through quickly and not for 3 minutes. you need to add a sleep(1) after the monitor.write so

for minutes = 2, 0, -1 do
  for seconds = 59, 0, -1 do
    monitor.clear()
    monitor.write((minutes < 10 and "0"..minutes or minutes)..":"..(seconds < 10 and "0"..seconds or seconds))
    sleep(1)
  end
end

This is what this section should be.

Thank you so much for that loop! It works perfectly for my situation! Ok so my final code for the program is this:

										 --Startup--
local monitor = peripheral.wrap("bottom")
monitor.clear()
monitor.setTextScale(1.5)
monitor.write("<Insert Keycards>")
os.pullEvent("redstone")   -- waits for the AND gate to activate after both cards are swiped
sleep(3)
monitor.setTextScale(4)
monitor.setCursorPos(2,1)
monitor.write("3:00")
sleep(1)

for minutes = 2, 0, -1 do
		for seconds = 59, 0, -1 do
				 monitor.clear()
				 monitor.setCusorPos(2,1)
				 monitor.write((minutes < 10 and "0"..minutes or  minutes)..":"..(seconds < 10 and "0"..seconds or seconds))
				 sleep(1)
		end
end

					  -- after about 3:00 have passed:
monitor.clear()
monitor.setCursorPos(2,1)
monitor.write("00:00")
rs.setOutput("left" , true)			  -- opens both the doors
sleep(10)
rs.setOutput("left", false)			  -- closes both the doors
os.reboot()

Works flawlessly, thanks so much!

I have included some pictures but i don't know how to upload them. :(/>

Try using Imgur and just linking

Computer Geek, on 14 September 2014 - 03:06 AM said:

I have included some pictures but i don't know how to upload them. :(/>

As Dragon said, use Imgur, then copy the BBcode link after you've uploaded a picture and paste that link.
By the way, saw that you started opening a code tag but never closed it, you can close it with