Proximity Door (OpenPeripherals)

-- Proximity door by Immington Industries (snirkimmington)
-- Requires OpenPeripheral Sensor block attached to computer.
-- For a door that opens when you sneek, see http://pastebin.com/Qwhb3c2e
-- R.S. signal will output when you approach the door.
-- Adjust the peripheral wrapping and min/max values.
-- Can be set to enable/disable R.S. on detection.
local sensor = peripheral.wrap('left') -- where the sensor is
local output = 'right' -- Where to output the signal
local initial = true -- What to output when no one's around
-- How close you need to be to the sensor in order to use it.
local minX = -2 local maxX = 2
local minY = 0  local maxY = 2
local minZ = -2 local maxZ = 2
-- Initial output
redstone.setOutput(output, initial)
while true do
    players = sensor.getPlayerNames()
    -- Don't do checks if there are no players.
    if #players == 0 then
        redstone.setOutput(output, initial)
        sleep(0.7)
    else -- There are players
        for _, name in pairs(players) do
            -- You can replace this with "if name == 'yourname'" to check for you
            -- For example, if name == 'snirkimmington' on my door.
            if name ~= '' then
                info = sensor.getPlayerData(name)
                pos = info.position

                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)
                    break
                end
            end
        end
        -- There are players around, we need to be more responsive
        sleep(0.5)
    end
end