Drinking water reminder cup and water shortage detection system based on STM32
With the rapid advancement of intelligent hardware, a variety of smart water cups have emerged in the market. However, most of these devices remind users to drink water based on fixed amounts, which often neglects individual differences. The key to healthy hydration lies in customizing water intake according to each person's specific needs.
To address this issue, a smart water cup was developed that takes into account variations in body functions among individuals. This system detects salt loss in the body and uses it to adjust the recommended daily water intake. By combining user data with real-time physiological feedback, the cup provides personalized reminders for optimal hydration. It is built around the STM32 series microcontroller, pressure sensors, and capacitive sensors, enabling accurate tracking of water consumption. Software programming allows the system to generate drinking patterns, evaluate habits, and offer quantitative guidance to help users form healthier routines.
The system consists of two main parts: the smart water cup (referred to as the cup end) and the human salt detection module (referred to as the detection end). The cup end is powered by an STM32F103C8T6 microcontroller, operating within a voltage range of 2.0V to 3.6V, and includes multiple power-saving modes to extend battery life. The detection end uses an STM32F103ZET6, which offers strong performance and supports external memory expansion and LCD display connections.
A combination of pressure and capacitive sensors monitors drinking behavior. The capacitive sensor detects the presence of the user’s hand, while the pressure sensor measures the weight of the liquid inside the cup. These signals are converted using the HX711 chip and displayed on an OLED screen. The wireless charging feature enhances convenience and safety for the user.
The detection end also includes a TDS sensor, RFID module, and WiFi connectivity. The TDS sensor can measure up to 2000 PPM, making it suitable for detecting urine salt levels. Unlike traditional contact-based identification methods, the RFID tag enables non-contact recognition, allowing for multi-target and moving object detection. This makes the system more versatile and applicable in various scenarios.
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