local component = require('component')
local redstone = component.redstone
local sides = require("sides")
local event = require("event")

while true do

    redstone.setOutput(sides.back, 15)
    redstone.setOutput(sides.back, 0)

    os.sleep(3)

    redstone.setOutput(5, 15)
    redstone.setOutput(5, 0)

    os.sleep(10)
end