使用定时器如何实现隔一段时间与Arduino通信的功能？程序提示memory error的原因？

[bick]

def set_outstr(timer):
    out_str ='['
    out_str +='(%d,%d)' %(x_error,y_error)
    out_str +=']'
    uart.write(out_str)   #向arduino传递out_str字符串
    print (out_str)

while(True):

    clock.tick() # Track elapsed milliseconds between snapshots().

    img = sensor.snapshot() # Take a picture and return the image.
    
    blobs = img.find_blobs([green_threshold])

    tim=Timer(4,freq=5)
    if blobs:

        max_blob = find_max(blobs)

        x_error = max_blob[5]-img.width()/2                           #X方向偏差

        y_error = max_blob[6]-img.height()/2                          #y方向偏差

        
        print("x error: ", x_error)
        print("y_error: ", y_error)
        img.draw_rectangle(max_blob[0:4]) # rect

        img.draw_cross(max_blob[5], max_blob[6]) # cx, cy
       
        tim.callback(set_outstr)

提示错误：uncaught exception in Timer(4) interrupt handler
MemoryError:
x error: -119.0
y_error: -21.0

[kidswong999]

你的代码不全，无法运行。