OC Integrated Tunnels Armor Stripper

--[[
south: trapdoor
west: tripwire under trapdoor
east: spike tripwire
]]

local component = require("component")
local sides = require("sides")
local redstone = component.redstone
local isMobStripping = nil

function openDoor()
    redstone.setOutput(sides.north, 15)
end

function closeDoor()
    redstone.setOutput(sides.north, 0)
end

function mobStripping()
    print(redstone.getInput(sides.west))
    if (redstone.getInput(sides.west) ~= 0) then
        isMobStripping = 1
        closeDoor()
    else
        isMobStripping = 0
        openDoor()
    end
end

function mobFell()
    if (isMobStripping == 1) then
        return nil
    end
    if (redstone.getInput(sides.east) ~= 0) then
        closeDoor()
    else
        openDoor()
    end
end

while (true) do
    mobStripping()
    mobFell()
    os.sleep(1/20)
end