Darkiss

c = peripheral.wrap("back")
if not c then shell.exit() end
term.clear()
term.setCursorPos(1,1)
minimum = 17

function first()
    if f == nil then
        f = true
        return true
    end
    return false
end

function pulse(rside, delay)
    if delay == 0 then delay = 1 end
    rs.setOutput(rside, true)
    sleep(delay/2)
    rs.setOutput(rside, false)
    sleep(delay/2)
end

function update()
    term.clear()
    term.setCursorPos(1,1)
    print("The pressure is okay. "..c.getPressure().." bars")
    sleep(0.5)
end

function problem()
    print("Problem: The pressure is low. "..c.getPressure().." bars")
    print("Starting up...")
    pulse("front", 0.5)
end

while true do
    if c.getPressure() < minimum then
        problem()
    else
        if first() then
            print("Starting up...")
            sleep(3)
        else
            update()
        end
    end
end