TARGET_FREQUENCY = 2

turtle.select(1)
a = 11
b = 0
while b < a do
    turtle.forward()
    b = b+1
    if b == a and turtle.getItemCount(1) < 1 then
        turtle.select(2)
        turtle.placeUp()
        turtle.select(1)
        turtle.suckUp()
        turtle.digUp()
        turtle.placeDown()
        b = 0
    end
    if b == a and turtle.getItemCount(1) > 0 then
        turtle.placeDown()
    b = 0
    end
    p = peripheral.wrap("bottom")
    p.setFrequency(TARGET_FREQUENCY)
end