Design of Bluetooth anti-lost Device Based on 51 Series Single Chip Microcomputer

Abstract

n order to solve the problems like the difficulty of people to retrieve the lost valuables in daily life and rampant theft in crowded areas, a practical Bluetooth anti-loss device based on 51 series single-chip microcomputer is proposed in this paper. It can effectively avoid the risk of users’ valuables being stolen or left behind, which has a very good market prospect. Based on the Bluetooth communication technology, this paper introduces the working principle of the Bluetooth tracker, and designs its hardware system circuit, including power module, crystal oscillator module, button module, alarm circuit, core controller, Bluetooth module and so on. The master and slave uses the same program design, by constantly sending handshake information to each other and using a timer to detect whether the other one is disconnected or not, achieves the anti-loss and anti-theft function. The Bluetooth anti-loss device designed has the advantages of high reliability, strong functionality, and high performance-to-price ratio.