Need help adding electricity to computers

Well the title explains it, I want to add electricity to my worlds and computers will only turn on if its connected to a redstone current. I used this code to make the computer turn on if it is connected to redstone but not if its not.
if not redstone.getInput("bottom") then
os.shutdown()
else
if redstone.getInput("bottom") then

end end

thats exactly what I typed into the computer and it worked but after the computer turns on if I remove the redstone current to the computer it stays on. My question is how to I get it to turn off after it turns on and the current then gets broken.
By the way I put the code into startup.

You can use parallel to check for power on the background:

local function checkPower()
  while true do
    if not rs.getInput("bottom") then
      os.shutdown()
    end
    os.pullEvent("redstone")
  end
end

parallel.waitForAny(checkPower, function() shell.run("/rom/programs/shell") end)
os.shutdown()

Not tested, but it should work.

There's no real way to have a redstone signal turn on the computer. What you will need to do is have the computer sit in a loop where it does not progress or do anything but sleep until it gets a redstone signal.

while true do
if rs.getInput("bottom") then
  break
else
  sleep(.1)
end
end

:P/>/>

MysticT, on 03 August 2012 - 10:17 PM said:

You can use parallel to check for power on the background:

local function checkPower()
  while true do
	if not rs.getInput("bottom") then
	  os.shutdown()
	end
	os.pullEvent("redstone")
  end
end

parallel.waitForAny(checkPower, function() shell.run("/rom/programs/shell") end)
os.shutdown()

Not tested, but it should work.

Thanks it worked perfectly so now if its on and I break the redstone it turns off till I fix the cable but at the top is says CraftOS 1.3 twice now but its not a big problem

I dont want to break anything so I was wondering if this would work if I added
rednet.open"right" to it cause I like to have the modem automatically turn on?

nevermind got it to work

Here you go:

local function checkPower()
  while true do
	if not rs.getInput("bottom") then
	  os.shutdown()
	end
	os.pullEvent("redstone")
  end
end

term.clear()
term.setCursorPos(1, 1)
rednet.open("right")
parallel.waitForAny(checkPower, function() shell.run("/rom/programs/shell") end)
os.shutdown()

Now it clears the screen before starting the new shell, so it doesn't write "CraftOS 1.X" twice, and opens the right side for rednet.
You can add anything you want to it, just do it before the parallel call, or it won't do it until it shuts down (unless that's what you want).

MysticT, on 03 August 2012 - 11:20 PM said:

Here you go:

local function checkPower()
  while true do
	if not rs.getInput("bottom") then
	  os.shutdown()
	end
	os.pullEvent("redstone")
  end
end

term.clear()
term.setCursorPos(1, 1)
rednet.open("right")
parallel.waitForAny(checkPower, function() shell.run("/rom/programs/shell") end)
os.shutdown()

Now it clears the screen before starting the new shell, so it doesn't write "CraftOS 1.X" twice, and opens the right side for rednet.
You can add anything you want to it, just do it before the parallel call, or it won't do it until it shuts down (unless that's what you want).

thanks alot and it says im clueless actually I know a bit about lua cause I played roblox since I was 10 and did some scripting on it

reallycrazyBailey, on 03 August 2012 - 11:42 PM said:

MysticT, on 03 August 2012 - 11:20 PM said:

Here you go:

local function checkPower()
  while true do
	if not rs.getInput("bottom") then
	  os.shutdown()
	end
	os.pullEvent("redstone")
  end
end

term.clear()
term.setCursorPos(1, 1)
rednet.open("right")
parallel.waitForAny(checkPower, function() shell.run("/rom/programs/shell") end)
os.shutdown()

Now it clears the screen before starting the new shell, so it doesn't write "CraftOS 1.X" twice, and opens the right side for rednet.
You can add anything you want to it, just do it before the parallel call, or it won't do it until it shuts down (unless that's what you want).

thanks alot and it says im clueless actually I know a bit about lua cause I played roblox since I was 10 and did some scripting on it

By the way it still says CraftOS twice

It shouldn't, since it clears the screen before starting the new shell. Have you added the lines to clear the screen?

MysticT, on 04 August 2012 - 12:07 AM said:

It shouldn't, since it clears the screen before starting the new shell. Have you added the lines to clear the screen?

Yeah I pratically copied and pasted the new code you gave me :P/>/>

reallycrazyBailey, on 03 August 2012 - 11:42 PM said:

actually I know a bit about lua cause I played roblox since I was 10 and did some scripting on it

Same here, man.

How would you change this from checking for a normal redstone input from the bottom as it is now to checking for a certain color being active via bundeledcable directly attached to the computer

deadlystrike, on 16 August 2012 - 07:40 PM said:

How would you change this from checking for a normal redstone input from the bottom as it is now to checking for a certain color being active via bundeledcable directly attached to the computer

I'm guessing it would be something like this:
let the colour of wire be N



local function checkPower()
while true do
if not rs.getBundledInput("bottom")==<decimal representation of the colour goes here> then
os.shutdown()
end
os.pullEvent("redstone")
end
end

term.clear()
term.setCursorPos(1, 1)
rednet.open("right")
parallel.waitForAny(checkPower, function() shell.run("/rom/programs/shell") end)
os.shutdown()

I haven't tested this but I assume that's what you would do…

sancarn, on 16 August 2012 - 08:09 PM said:

deadlystrike, on 16 August 2012 - 07:40 PM said:

How would you change this from checking for a normal redstone input from the bottom as it is now to checking for a certain color being active via bundeledcable directly attached to the computer

I'm guessing it would be something like this:
let the colour of wire be N



local function checkPower()
while true do
if not rs.getBundledInput("bottom")==<decimal representation of the colour goes here> then
os.shutdown()
end
os.pullEvent("redstone")
end
end

term.clear()
term.setCursorPos(1, 1)
rednet.open("right")
parallel.waitForAny(checkPower, function() shell.run("/rom/programs/shell") end)
os.shutdown()

I haven't tested this but I assume that's what you would do…

im slighly confused,
1: where do i find the decimal representaions of each color
2: do i incule the double == and brackets< .. >

http://computercraft.info/wiki/index.php?title=Colors_(API)
That will give you all of the color representations.

craniumkid22, on 16 August 2012 - 09:26 PM said:

http://computercraft...tle=Colors_(API)
That will give you all of the color representations.

Colors (API


There is currently no text in this page. You can search for this page title in other pages, search the related logs, or edit this page.

Oops, I forgot, the copy/paste of links here is a little derpy. Here: This should work

local function checkPower()
while true do
if not rs.getBundledInput("bottom")==<2> then
os.shutdown()
end
os.pullEvent("redstone")
end
end

term.clear()
term.setCursorPos(1, 1)
rednet.open("right")
parallel.waitForAny(checkPower, function() shell.run("/rom/programs/shell") end)
os.shutdown()

im geting a unexpected symbol on line 3

There should not be a <> around 2. It is a number. The line should read like this:

if not rs.getBundledInput("bottom") == 2 then

fixed it, no errors at all however it simply doesn't work i have a bundled cable plugged into the bottom
it makes no difference if orange (2) is on or not the computer is still accessible and unchanged

Does the cable terminate AT the bottom of the computer, or does it just run ON the bottom? Bundled cables must terminate at computers.
I this is not the case, then I'll have to check the code when I get home later. Or maybe some of the other pros could chime in? :(/>/>

im not sure what you mean by terminate, but the cable is connected properly as there are other programs on the computer making use of its other colors

edit: yeah just figured out what you meant, it terminates at the bottom

OK, I'll have to check it out later then… I'm at work, and not in "Code mode"

Using rs.testBundledInput and the colors api is easier, this should work:

local function checkPower()
  while true do
	if not rs.testBundledInput("bottom", colors.orange) then
	  os.shutdown()
	end
	os.pullEvent("redstone")
  end
end

term.clear()
term.setCursorPos(1, 1)
rednet.open("right")
parallel.waitForAny(checkPower, function() shell.run("/rom/programs/shell") end)
os.shutdown()

local function checkPower()
  while true do
	    if not rs.testBundledInput("bottom", colors.orange)
  and
  if not rs.testBundledInput("back", colors.orange) then
		  os.shutdown()
	    end
	    os.pullEvent("redstone")
  end
end
term.clear()
term.setCursorPos(1, 1)
rednet.open("right")
parallel.waitForAny(checkPower, function() shell.run("/rom/programs/shell") end)
os.shutdown()

1: will this work?
2: why do i get a unexpected symbol on line 5

I think it should be:

local function checkPower()
  while true do
		if not rs.testBundledInput("bottom", colors.orange) and not rs.testBundledInput("back", colors.orange) then
		  os.shutdown()
		end
		os.pullEvent("redstone")
  end
end
term.clear()
term.setCursorPos(1, 1)
rednet.open("right")
parallel.waitForAny(checkPower, function() shell.run("/rom/programs/shell") end)
os.shutdown()

sancarn, on 17 August 2012 - 03:59 PM said:

I think it should be:

local function checkPower()
  while true do
		if not rs.testBundledInput("bottom", colors.orange) and not rs.testBundledInput("back", colors.orange) then
		  os.shutdown()
		end
		os.pullEvent("redstone")
  end
end
term.clear()
term.setCursorPos(1, 1)
rednet.open("right")
parallel.waitForAny(checkPower, function() shell.run("/rom/programs/shell") end)
os.shutdown()

thanks dude, do you know if i wanted to add more sides if i could simply just append more of them like you did with back?