startup.lua

pw = "Nooters"

rs.setAnalogOutput("back",15)

function setLaser(str)
local power = 0
    if str == pw then
        power = 0
    else
     power = 15
     end
    rs.setAnalogOutput("back",power)
end

while true do
    term.clear()
    term.setCursorBlink(true)
    term.setCursorPos(1,1)
    textutils.slowWrite([[Welcome to the Lab...
    Enter Password:]] )
    local input = read("*")
    setLaser(input)
    os.sleep(5)
    rs.setAnalogOutput("back",15)
end