舵机引脚一直没输出怎么回事

[18825981694]

我的 舵机引脚一直没输出怎么回事
import time
from pyb import Servo

s1 = Servo(1) # P7
s2 = Servo(2) # P8

while(True):
for i in range(1000):
s1.pulse_width(1000 + i)
s2.pulse_width(1999 - i)
time.sleep(10)
for i in range(1000):
s1.pulse_width(1999 - i)
s2.pulse_width(1000 + i)
time.sleep(10)

[kidswong999]

PWM，用示波器看一下波形