Tank Checker

tankSide = "right"
signalSide = "back"
updateDelay = 5 --in seconds
fill = 0.2 --in % --> 0-1
x,y = term.getSize()

function clear() --GUI stuff.
 term.clear()
 term.setCursorPos(1,1)
end

function drawLine() --GUI stuff.
 for i=1,x-1 do
  write("-")
 end
end

function setup()
 clear()
 drawLine()
 print("Monitoring on side: "..tankSide)
 print("Sending signal to side: "..signalSide.." every "..updateDelay.." seconds.")
 print("Outputting if below "..(fill*100).."%")
 drawLine()
 tank = peripheral.wrap(tankSide)
 if tank == nil then
  clear()
  drawLine()
  print("No tank found!")
  drawLine()
  error()
 end
 sleep(4)
end

function display()
 clear()
 drawLine()
 print("Status:")
 print("Tank: "..currentContent.."/"..maxContent)
 percentage = (currentContent *100) / maxContent
 print("Tank is "..math.floor(percentage).."% full.")
 --print("Redstone is: "..rsstate..".")
 signal = currentContent < (maxContent * fill)
 if signal then
  print("Below Threshold!")
 else
  print("Above Threshold.")
 end
 print("")
 print("Update Interval: "..updateDelay.."s")
 drawLine()
end

function main()
 while true do
  currentContent = 0
  maxContent = 0
  tankdata = tank.getTankInfo(tankSide)
  for i,j in pairs(tankdata) do
    for name,data in pairs(j) do
      if name=="capacity" then
       maxContent = data
      elseif name=="amount" then
       currentContent = data
      end
    end
  end
  display()
  rs.setOutput(signalSide,signal)
  sleep(updateDelay)
 end
end

setup()
main()