Abstract : Traditional constant pressure water supply systems achieve constant pressure by controlling the return flow rate. However, this method suffers from high energy consumption, high investment costs, and system complexity. This paper adopts a constant pressure water supply system using a microcontroller as the control core, embedding fuzzy control technology, and utilizing a frequency converter. During operation, the system runs smoothly, demonstrating an ideal constant pressure control system. Keywords : Water supply system; Fuzzy control; Frequency converter speed regulation; Constant pressure control; Microcontroller 0 Introduction With societal development, the demand for water from various industries has increased. To ensure water quality and conserve resources, a constant pressure water supply system is essential. Traditional constant pressure water supply systems achieve constant pressure by controlling the return flow rate, which is unsuitable for current needs. In a constant pressure water supply system, the entire control system is a nonlinear, time-varying, and complex system. Traditional PID control technology struggles to achieve satisfactory control results. This paper employs fuzzy control technology to realize a constant pressure water supply control system. This paper uses a microcontroller as the control core, embedding fuzzy control technology, and utilizing a frequency converter to achieve a constant pressure water supply system. 1. Composition of a Constant Pressure Water Supply Control System The constant pressure water supply system is a closed-loop control system composed of a microcontroller embedded with fuzzy control technology, a frequency converter, a pressure sensor, an electrical control cabinet, and a water pump unit. The system structure principle block diagram is shown in Figure 1. The system compares the given pressure value with the actual pressure value; the difference and the change in that difference are the input variables for fuzzy control. The pressure sensor is installed on the main water supply pipeline. Through pressure signal processing and amplification, fuzzy control technology in the microcontroller is used to adjust the speed of the frequency converter, achieving constant pressure water supply. Based on the given pressure signal and the feedback pressure signal, the microcontroller performs fuzzy inference calculations and outputs a 0-10V (or 4mA-20mA) signal to adjust the speed of the frequency converter, thereby maintaining the water pressure in the pipe network. [b][align=center]For more details, please click: Application of Microcontroller-Based Fuzzy Control Technology in Constant Pressure Water Supply[/align][/b]