回复: RuntimeError: Sensor control failed

import pyb
from pyb import LED #导入LED
from machine import UART
import sensor, image, time, math, os, tf
uart = UART(1, baudrate=115200)
sensor.reset()
sensor.set_pixformat(sensor.GRAYSCALE)
sensor.set_framesize(sensor.QVGA)
sensor.set_auto_exposure(False, 1000)
sensor.__write_reg(0x03,0x04)
sensor.__write_reg(0x04,0x05)
sensor.__write_reg(0xB2,0x40)
sensor.__write_reg(0xB3,0x00)
sensor.__write_reg(0xB4,0x40)
sensor.__write_reg(0xB5,0x00)
sensor.__write_reg(0x03,0x03)
sensor.__write_reg(0x5B,0x60)
sensor.__write_reg(0x03,0x08)
sensor.set_auto_whitebal(False, (0x80,135,0x80))
sensor.set_brightness(500)
sensor.set_auto_gain(False)
sensor.skip_frames(time = 2000)
clock = time.clock()
Large_area=[0,0,320,180]
min_degree = 45
max_degree = 135
i=0
yzb=[0,0]
he=[]
ypj=[]
yjd=[]
lbypj=[]
lbyjd=[]
suibian=[]
red_threshold = (0,150)
def get_pj(point):
    point_1 = point[0]
    point_2 = point[1]
    he = int((point_1+ point_2)/2)
    return he
while(True):
    img = sensor.snapshot()
    img.binary([red_threshold])
    #img.draw_rectangle(Large_area, color = (255, 0, 0))
    for l in img.find_line_segments(roi=Large_area,merge_distance = 10, max_theta_diff = 10):
            #if (min_degree <= l.theta()) and (l.theta() <= max_degree):
                img.draw_line(l.line(), color = (255, 0, 0))
                #print(l.line())
                yzb = [l.y1(),l.y2()]
                #yjd= [l.theta()]
                ypj = get_pj(yzb)
                if(i<5):
                    lbypj.append(ypj)
                    #lbyjd.append(yjd)
                    i=i+1
                if (i==5):
                    #suibian=lbypj
                    ypjmax=max(lbypj)
                    juliy=240-ypjmax
                    img.draw_line([0,ypjmax,320,ypjmax], color = (255, 0, 0))
                    #zuidixian=suibian.index(max(suibian))
                    #outjd =lbyjd[zuidixian]
                    print(juliy)
                    lbypj=[]
                    #lbyjd=[]
                    i=0

import sensor, image, time

# 仍然需要初始化 sensor
sensor.reset()
# 设置 sensor
sensor.set_contrast(1)
sensor.set_gainceiling(16)

# 设置sensor的 pixel format
sensor.set_framesize(sensor.QQVGA)
sensor.set_pixformat(sensor.GRAYSCALE)

# 导入 image
img = image.Image("/example.bmp", copy_to_fb=True)

# 添加画线的代码
# img.draw_line(...)

# Flush FB
sensor.flush()

# Add a small delay to allow the IDE to read the flushed image.
time.sleep(100)

sensor.__write_reg(0x0D,0x003A)

OpenMV4 Plus用的是ov5640的sensor，OpenMV3用的是ov7725的sensor。
在暗光情况下ov5640会比ov7725更暗一些。

gain_db的值不对。

运行这个程序，可以获得当前的gain_db
https://book.openmv.cc/example/21-Sensor-Control/sensor-manual-whitebal-control.html

sensor.set_auto_whitebal(False)，要添加第二个参数的。

代码：https://book.openmv.cc/example/21-Sensor-Control/sensor-manual-whitebal-control.html

同理，sensor.set_auto_gain你也得改。

https://book.openmv.cc/example/21-Sensor-Control/sensor-manual-whitebal-control.html

色温就是调节白平衡。

sensor.set_auto_whitebal(False, rgb_gain_db = (0.0, 0.0, 0.0))

里面设置值。

import sensor, image, tv
from PIL import Image

sensor.reset() # Initialize the camera sensor.
sensor.set_pixformat(sensor.RGB565) # or sensor.GRAYSCALE
sensor.set_framesize(sensor.QQVGA)
tv.init() # Initialize the tv.

while(True):
img = sensor.snapshot()
img.convert('L')
tv.display(img)

你可以把sensor.get_gain_db(), sensor.get_exposure_us()打印出来。

用的是什么感光元件？

参考：https://book.openmv.cc/example/21-Sensor-Control/sensor-auto-gain-control.html