startup

digtime = 40
recovertime = 5

while true do
  if redstone.getInput("left") then
    -- dig first
    redstone.setOutput("back", true)
    sleep(digtime)
    -- stop digging and recover miners
    redstone.setOutput("back", false)
    sleep(recovertime)
    -- Move frame machine
    redstone.setOutput("right", true)
    sleep(0.4)
    redstone.setOutput("right", false)
    sleep(0.8)
    -- Check if still on and enable digging if so
    if redstone.getInput("left") then
      redstone.setOutput("back", true)
    end
    -- Inchworm second motor
    redstone.setOutput("front", true)
    sleep(0.4)
    redstone.setOutput("front", false)
    sleep(0.4)
  end
  sleep(0.4)
end