# Untitled - By: Dell - 周四 9月 3 2020

import sensor, image, time
from pyb import Pin, Timer,LED
import math

sensor.reset()
sensor.set_pixformat(sensor.GRAYSCALE)
sensor.set_framesize(sensor.VGA)
sensor.skip_frames(time = 2000)
sensor.set_auto_gain(True) # must be turned off for color tracking
sensor.set_auto_whitebal(True) # must be turned off for color tracking
clock = time.clock()

blue_led  = LED(3)
red_led = LED(1)

ROI = (200,80,240,280)     # 定义感兴趣范围
MY_AREA=ROI

def tick1(timer):
    red_led.toggle()
    img = sensor.snapshot()
    img.draw_rectangle(MY_AREA)

tim = Timer(2, freq=0.2)      # 使用定时器2创建定时器对象-以1Hz触发

tim.callback(tick1)

#tim.callback(lambda t:tick())          # 将回调设置为tick函数

while (True):
    img = sensor.snapshot()
    img.draw_rectangle(MY_AREA)
    time.sleep(10)