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Design and Implementation of a Non-Contact Control Panel Control System Based on STM32

Author(s)

Junhui Huang, Zhijian Chen, Siyi Liu

Affiliation(s)

Guangdong AIB Polytechnic, Guangzhou, Guangdong, China

Abstract

The non-contact control panel system introduced in this paper uses the STM32F103C8T6 microcontroller as the core controller, integrating four diffuse reflective photoelectric switches and an ultrasonic distance measurement module to allow gesture-based driving of a DC motor start/stop, forward/reverse rotation, and continuous speed adjustment. The system architecture follows a four-layer design: a sensing layer used to detect hand proximity and direction, a control layer for gesture recognition and command generation, an execution layer that uses the L298N dual H-bridge motor driver with PWM to control voltage between 3V and 10V, and a power management layer that supplies constant 3.3V, 5V and 12V to every module through DC-DC converters. A 128×64 OLED display is used to provide real-time feedback on operational status, set parameters, and distances measured. The detection range for start/stop control is between 5 to 30 centimeters. The system has a measuring error of less than 1 centimeter. The system not only provides timely but also accurate gesture recognition, meets design requirements for motor control precision, and operates stably and reliably without any physical contact. This design offers an efficient, hygienic, and cost-effective control solution for applications requiring non-contact human-machine interaction.

Keywords

STM32F103C8T6; Photoelectric Switch; Gesture Recognition; Non-Contact Control; Ultrasonic Distance Measurement; DC Motor Control; PWM Modulation

References

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