Timmer

function pulseBack()
    rs.setOutput("back", true)
    sleep(0.5)
    rs.setOutput("back", false)
end

function pulseLeft()
    rs.setOutput("left", true)
    sleep(0.5)
    rs.setOutput("left", false)
end

function pulseRight()
    rs.setOutput("right", true)
    sleep(0.5)
    rs.setOutput("right", false)
end

while true do
    while not rs.getInput("front") do
        pulseLeft()
        sleep(3)
        pulseLeft()
        pulseBack()
        pulseRight()
        sleep(3)
    end
    sleep(1) -- just to keep main loop from running crazy fast when timer off
end