Auto-Spawner : Spawn

local typex="Cow"
local sens=peripheral.wrap("right") -- sensor side
local RSside="left" -- redstone side
local amount=5 -- how many mobs you want to spawn
local active=0
while true do
    local counter=0
    if active==0 then
        print("Press the spacebar button in order to spawn a "..typex.." "..amount.." times.")
        local event,scancode=os.pullEvent("key")
        if scancode==57 then
            redstone.setOutput(RSside,true)
            active=1
        end
    else

        for i,v in ipairs(sens.getMobIds()) do
            if sens.getMobData(v)["type"]==typex then
                counter=counter+1
                print("Mob number "..counter.." spawned.")
                if counter==amount then
                    print("All mobs spawned, halting.")
                    redstone.setOutput(RSside,false)
                    active=0
                end
            end
        end
    end
end