Abstract:Based on the medical mechanism and sedative effect of transcutaneous electrical acupoint stimulation, a smart music low
frequency pulse physiotherapy instrument to relieve preoperative anxiety was designed. ATmega128 was used as the main control
chip in the hardware part. Excitive main circuit, power supply circuit, music player, low-pass filter and peripheral circuit were
designed. In the software part, procedures such as sine pulse width modulation waveform output, DA conversion current limiting,
LCD display, audio decoding etc. were designed. The relevant test experiments and preliminary clinical observations show that the
instrument output waveform is gentle, the frequency change is fluent, and it has a good effect on relieving preoperative anxiety.