Implementation Of A FPGA-based Electronic Secret Code Lock With Infrared Remote Control

With the improvement of the people's living standards, the problem of how to achieve safe and effective anti-theft has been paid more and more attention. The safety performance of the traditional mechanical lock is so bad that it is often broken by theft. However, because of the strong confidentiality, flexibility, and high safety, the electronic lock is being chosen by the great majority of users. At present most of the electronic locks are based on the single-chip microcomputer, in which the encoder and decoder are commonly implemented by software. In practical application, the process runs out of truck easily, so the reliability of the system can be very poor.In this paper, one design method of electronic secret code lock with infrared remote control is introduced which is based on field programmable gate arrays FPGA devices. Focusing on the overall architecture design, this paper introduces a construction method for infrared remote control system that adopts the PT2248 as a transmitter, MIM-R1AA38KHZ integrated infrared receiver demodulator as a receiver. It explains how to use EDA technology top-down design approach to achieve infrared remote control decoder chip, open the lock, change the passwords, alarm and LCD display process based on the series of Spartan-3E FPGA made by Xilinx. In the analysis of the function modules of the electronic secret code lock system, this paper elaborates on the functions of various modules, external interface signals, and gives the simulation waveform of each module, the testing process of the entire system and test results. This paper also details in features and performance of Spartan-3E FPGA chip, at the same time, using the KCPSM3 of XC3S500, one of the series of Spartan-3E FPGA, and its self-designed controller to implement LCD display controller respectively. Through comparative analysis, it is proved that the controller which is realized by KCPSM3 makes the utilization of the FPGA resources more suitable and implement the functions more conveniently. The security performance of electronic secret code lock has greatly enhanced by using infrared remote control technology. FPGA-based development and design which is achieved all entirely by the hardware circuit algorithm, makes the system work much more reliability, as well as because FPGA in the system can be made available for the in-system programmable function, when the design needs to be changed, the control and the interface circuit can be restructured in the FPGA conveniently, using EDA tools ,to download the updated design to the FPGA without changing the external circuit design. So the efficiency of the design can be proved. Thus, the digital system implemented by FPGA is of high reliability, and the upgrade and improvement is extremely convenient.