"基于STC89C52单片机的蓝牙防丢器系统设计与实现"

osing valuable items, the feeling of regret and even panic is truly agonizing! Nowadays, life is getting faster paced and the environment is becoming increasingly unpredictable, which leads to situations like forgetfulness, negligence, and theft causing valuable items to be lost almost every day. Therefore, to prevent these accidents from happening, you need a faithful guardian by your side, which is carrying a set of anti-loss device to effectively protect your valuable items from being lost! This design of Bluetooth anti-loss device is composed of STC89C52 microcontroller, reset circuit, crystal oscillator circuit, Bluetooth module circuit, mobile phone receiving alarm and power module. Firstly, open the Bluetooth on your phone and pair it with the mainboard Bluetooth, once the pairing is successful, the microcontroller sends data to the Bluetooth module HM-05 via serial port, and the phone Bluetooth receives the data in real-time. When the distance between the phone and the Bluetooth mainboard exceeds a certain distance, the phone will produce an alarm sound, indicating potential theft, prompting you to quickly go back and check. The Bluetooth anti-loss device has high reliability, good stability, strong anti-interference ability, and is easy to use. It also offers high cost-effectiveness. Keywords: STC89C52 microcontroller, Bluetooth anti-loss device, Bluetooth communication.