给左右电机相同的pwm，然后显示计数
可见左右两个电机在相同pwm下，转速差异接近1倍
这导致直接用角度来做平衡控制时，小车有旋转的倾向
研究研究……
IMU data Offsets:
ax -1189.076416, ay -259.313019, az -546.771606
gx -63.78……
Starting download script...
SUCCESS: Sketch will execute in about 5 seconds.
Error openi……
ERROR: Device is not responding.
Device is not responding, check the right serial port is……
Starting download script...
Flashing is taking longer than expected
Try pressing MASTER_……
processing.app.SerialException: Error opening serial port 'COM9'.
at p……
好不容易上传成功
启动串口监视器
Starting download script...
SUCCESS: Sketch will execute in ……
