Keypad Code (For OpenSecurity)

keypad = require("component").os_keypad
event = require("event")

local pin = "1234"
local keypadInput = ""

function checkPin()
    if keypadInput == pin then
        keypad.setDisplay("Pass", 2)
    else
        keypad.setDisplay("Wrong", 4)
    end
    keypadInput = ""
    os.sleep(1) -- Enforce a small delay to keep text for a short time
end

function keypadEvent(eventName, address, button, label)
    if button == 10 then -- Is it del
        keypadInput = string.sub(keypadInput, 1, -2) -- Del last char
    elseif button == 12 then
        checkPin()
    else
        keypadInput = keypadInput .. button_label
    end
    keypad.setDisplay(keypadInput, 7)
end
event.listen("keypad", keypadEvent)