Test radar

local whitelist = {"GravityCube"}
local rs_side = "top"

local sensors = {}
for k,v in pairs(peripheral.getNames()) do
    if peripheral.getType(v) == "openperipheral_sensor" then
        table.insert(sensors, peripheral.wrap(v))
    end
end

function getPlayers()
    local players = {}
    for k,v in pairs(sensors) do
        local players_s = v.getPlayerNames()
        for _,player in pairs(players_s) do
            table.insert(players, player)
        end
    end
    return players
end

function isWhitelisted(player)
    for k,v in pairs(whitelist) do
        if player == v then
            return true
        end
    end
    return false
end

while true do
    local players = getPlayers()
    rs.setOutput(rs_side, false)
    for k,v in pairs(players) do
        if  not isWhitelisted(v) then
            rs.setOutput(rs_side, true)
        end
    end
    sleep(2)
end