H-Bridge Bipolar Stimulation System with Real-time GSR Sensor Feedback

This paper presents an H-bridge bipolar electrical stimulation system driven by boost, which integrates a real-time galvanic skin response feedback sensor. Using the H-bridge circuit constructed with MMBT5401 transistors, the system achieves stable output of the bipolar neural stimulation signal. The GSR sensor is designed with low noise and high stability LM324PW op amp, which can monitor skin conductance changes in real time and feed back to the ESP32 microcontroller to dynamically adjust the stimulation intensity and achieve close loop control. The test results show that the system has stable and reliable output under different load conditions, can respond to changes in the user's physiological state in real time. The highly integrated PCB design, with a size less than 10 cm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>, shows promising application potential in neural regulation, wearable rehabilitation devices, and emotional computing.