"STC89C52单片机蓝牙防丢器系统设计与应用"

ve experienced the painful experience of losing valuable items, which can cause anxiety and distress. With the fast pace of life and increasingly unsafe environment, the risk of losing valuable items due to forgetfulness, negligence, or theft is high. To prevent such accidents, it is important to have a reliable guardian by your side, such as a Bluetooth anti-lost device, which can effectively protect your valuables from getting lost. This design of a Bluetooth anti-lost device is based on the STC89C52 microcontroller, reset circuit, crystal oscillator circuit, Bluetooth module circuit, mobile phone receiver alarm, and power module. Firstly, the mobile phone Bluetooth is paired with the main board Bluetooth, and once paired successfully, the microcontroller sends data to the Bluetooth module HM-05 through the serial port. The mobile phone Bluetooth then receives real-time data. When the distance between the mobile phone and the Bluetooth main board exceeds a certain distance, the mobile phone emits an alarm sound, alerting the user of potential thieves, prompting them to investigate immediately. The Bluetooth anti-lost device is reliable, stable, resistant to interference, and easy to use, with a high cost-performance ratio. Keywords: STC89C52 microcontroller, Bluetooth anti-lost device, Bluetooth communication.