if left_speed < 0:
ain1.low()
ain2.high()
else:
ain1.high()
ain2.low()
ch1.pulse_width_percent(abs(left_speed))

if right_speed < 0:
bin1.low()
bin2.high()
else:
bin1.high()
bin2.low()
ch2.pulse_width_percent(abs(right_speed))
这段代码当left_speed<0时，小车会怎么运动
left_speed<0和left_speed>0的区别是什么

if blobs:
max_blob = find_max(blobs)
x_error = max_blob[5]-img.width()/2
h_error = max_blob[2]*max_blob[3]-size_threshold
print("x error: ", x_error)
img.draw_rectangle(max_blob[0:4]) # rect
img.draw_cross(max_blob[5], max_blob[6]) # cx, cy
x_output=x_pid.get_pid(x_error,1)
h_output=h_pid.get_pid(h_error,1)
print("h_output",h_output)
car.run(-h_output-x_output,-h_output+x_output)
else:
car.run(18,-18)
当程序else时不会转；
如果car.run(18,18)就会动；
只要是负值就不会动