iek

function findPeripheral(typeName)
    local function contains(str, find)
        if (str == nil or find == nil) then
            return true
        end
        if (string.find(str, find, 1) == nil) then
            return false
        end
        return true
    end
    local side
    side = peripheral.wrap("left")
    if (side ~= nil) then
        if (contains(peripheral.getType("left"), typeName)) then
            return side
        end
    end
    side = peripheral.wrap("front")
    if (side ~= nil) then
        if (contains(peripheral.getType("front"), typeName)) then
            return side
        end
    end

    side = peripheral.wrap("right")
    if (side ~= nil) then
        if (contains(peripheral.getType("right"), typeName)) then
            return side
        end
    end

    side = peripheral.wrap("back")
    if (side ~= nil) then
        if (contains(peripheral.getType("back"), typeName)) then
            return side
        end
    end

    side = peripheral.wrap("top")
    if (side ~= nil) then
        if (contains(peripheral.getType("top"), typeName)) then
            return side
        end
    end

    side = peripheral.wrap("bottom")
    if (side ~= nil) then
        if (contains(peripheral.getType("bottom"), typeName)) then
            return side
        end
    end

    return nil
end

function calculateCenter(w, text)
    return math.floor((w - string.len(text)) / 2) + 1
end

function writeMonitor(mon, x, y, text)
    mon.setCursorPos(x, y)
    mon.write(text)
end

function clearBackground(mon, colourr, textColour)
    mon.setBackgroundColor(colourr)
    mon.setTextColor(textColour)
    mon.clear()
end

function main()
    local monitor = findPeripheral("monitor")
    monitor.setTextScale(5)
    local line1 = "Particle"
    local line2 = "Station"

    while(true) do
        local w, h = monitor.getSize()
        local y = math.floor(h / 2)
        local x1 = calculateCenter(w, line1)
        local x2 = calculateCenter(w, line2)

        clearBackground(monitor, colours.black, colours.lime)
        writeMonitor(monitor, x1, y, line1)
        writeMonitor(monitor, x2, y + 1, line2)

        os.sleep(5)
    end
end

main()