ProximityDoor v2.3

--ProximityDoor by KapitanWalnut
--version 2.3
--Redstone turns on when players are within range
--NOTE: utilizes OpenPeripheral sensor

local sensor = peripheral.wrap("left") --sensor location
local output = "back" --output for door
local initial = true --default state of redstone

--Proximity to sensor for door to open
local minX = -3 local maxX = 5
local minY = 1  local maxY = 3
local minZ = -3 local maxZ = 3

--Initialize
redstone.setOutput(output, initial)
--Infinite loop
while true do
    players = sensor.getPlayerNames()
    --stop checking if no players
    if #players == 0 then
        redstone.setOutput(output, initial)
        sleep(0.7)
    else --players in vicinity
        for _, name in pairs(players) do
            if name ~= "" then --player has a name (can put specific names here)
                info = sensor.getPlayerData(name)
                pos = info.position
                --check if within correct area
                if pos.x >= minX and pos.x <= maxX
                and pos.y >= minY and pos.y <= maxY
                and pos.z >= minZ and pos.z <= maxZ then
                    redstone.setOutput(output, not initial)
                else
                    redstone.setOutput(output, initial)
                end
            end
        end
        sleep(0.5)
    end
end