code

name = "dragonmaster90"
side = "right"

function clear()
   term.clear()
   term.setCursorPos(1, 1)
end

function green()
   term.setBackgroundColor(colors.green)
   clear()
end

function red()
   term.setBackgroundColor(colors.red)
   clear()
end

function white()
   term.setBackgroundColor(colors.white)
   clear()
end

if not term.isColor() then
   color = false
else
   color = true
end

clear()
while true do
   if color then white() end
   a, b = os.pullEventRaw()
   if a == "player" and b == name then
      if color then green() end
      redstone.setOutput(side,true)
      sleep(1)
      redstone.setOutput(side,false)
   else
      if color then red() end
      sleep(1)
   end
end