os.loadAPI("ocs/apis/sensor")

local proximity = sensor.wrap("top")
local open = false

--print(textutls.serial ize(proximity.getTargets()))


while 1 > 0 do
 open = false
 os.sleep(0.5)
 for k,v in pairs(proximity.getTargets()) do
   if v ~= nil and v["isPlayer"] == true then
     local pos = v["position"]
       open = True
     end
   end
 end
 if Open == true then
   redstone.setAnalogOutput("back",15)
 else
   redstone.setAnalogOutput("back",0)
 end
end