Security has been an important factor in life. We need homes, offices and our properties to be secured as much as possible to protect from unauthorized access. So security control systems and access control methods play vital role in modern technologies. A lot of research has been conducted on these methods and techniques. Discovering the more and more efficient control technology concerned with security becomes a challenging matter. In this paper, microcontroller-based code lock system which is simple in design, low in cost and high in level of security is presented. The system consists of microcontroller, 16x2 Liquid Crystal Display, 4x3 keypad and buzzer. The system has been developed and implemented by applying embedded control technique. The core value of the system is that it can provide user longer password length up to 9 digits compared with the other microcontroller-based password lock systems of which password length is just maximum 6 digits. So the system can provide higher level of security than any other system of its kind because longer password length makes the password more secure and the system more powerful in term of security. Moreover, the user can vary the password length as needed within the one to nine digits.