App

To install the appstore app, right-click on your turtle to open the GUI, run pastebin get iXRkjNsG appstore. To install farmPumpkins, run appstore get UltraBob farmPumpkins.
-- https://turtleappstore.com/u/UltraBob/a/farmPumpkins
os.loadAPI('hare')
delay = 5

if not hare.findBlock('minecraft:chest') then
    error('Must start next to a chest.  It should be in the right-rear corner on the end of a pumpkin row.')
end

-- storePumpkins() puts all pumpkins into an
-- adjacent chest
function storePumpkins()
    -- face the chest
    if not hare.findBlock('minecraft:chest') then
        error('Could not find chest.')
    end

    -- store wheat in chest
    while hare.selectItem('minecraft:pumpkin') do
        print('Dropping off ' .. turtle.getItemCount() .. ' pumpkins...')
        if not turtle.drop() then
            error('Pumpkin chest is full!')
        end
    end

    -- face field again
    turtle.turnLeft()
    turtle.turnLeft()
end

function harvestRow()
    for i = 1,10 do
        turtle.forward()
        result, block = turtle.inspectDown()
        if block.name == "minecraft:pumpkin" then
            turtle.digDown()
        end
    end
end

function harvestRowPair()
    harvestRow()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft()
    harvestRow()
end

function getToNextRowPair()
    turtle.turnRight()
    for i = 1, 4 do
        turtle.forward()
    end
    turtle.turnRight()
end

function returnToChest()
    turtle.turnLeft()
    for turn = 1, 6 do
        turtle.forward()
    end
end

turtle.turnLeft()
turtle.turnLeft()
while true do
    harvestRowPair()
    getToNextRowPair()
    harvestRowPair()
    returnToChest()
    storePumpkins()
    for i = delay, 1, -1 do
        print(i, "minutes until next run")
        os.sleep(60)
    end
end