Hello! Import python matrix library import os import time from ctypes import * lib = cdll.LoadLibrary('/root/matrix-master/lib/libfahw.so') funcpwm0=lib.boardInit() os.system("modprobe matrix_pwm") i = 1 while i < 1000: print(i) i = i + 1 time.sleep(0.025) funcpwm=lib.PWMPlay(0, 1000, i) funcpwm_stop=lib.PWMStop(0)