startup.lua

local inputNeeded = "minecraft:sand"
local inputAmount = 1
local outputAmount = 1
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os.loadAPI("bpFuncs.lua")

local suckItems = false
local inputDropper = peripheral.wrap("front")
local outputDropper = peripheral.wrap("right")
while true do
    for slot, item in pairs(inputDropper.list()) do
        if (item.name == inputNeeded) and (bpFuncs.GetOutputItems(outputDropper) >= outputAmount)  then
            if item.count >= inputAmount then
                for i = 0, outputAmount, 1 do
                    bpFuncs.SpitItem("right")
                    os.shutdown()
                end
            end
        else
            bpFuncs.SpitItem("front")
        end
    end
    sleep(0)
end