[英]Testing multiple DS18B20 sensor cables
我真的是python和編碼的新手,所以我在這里尋求幫助。 在工作中,我們需要測試最多連接五個DS18B20傳感器的電纜。 我們得到了這個程序,並且已經使用了一段時間了,以通過樹莓派測試電纜。 但是,它幾乎沒有問題。
該程序需要檢測連接的傳感器的數量,並查看它們是否正常工作,然后按序列號從最低到最高的順序列出它們(以便我們對其進行預熱,看看其中哪一個被突出顯示,並逐一進行編號)重復。
通常感覺很慢,並且經常崩潰。 使用連接了5個傳感器的電纜,它可以在最多2條電纜上找到傳感器(如果幸運的話,可以找到更多),而當您連接第3條電纜時,它將不再找到它們,或者會一直說連接了10個傳感器。 重新啟動Pi可以解決此問題,但需要花費一些時間。 熱插拔電纜可能是此處的罪魁禍首,但這是最快的方法。
使用3條傳感器電纜,您可以檢查4-5條電纜,直到其掛起。
任何暗示問題可能出在哪里或我如何使事情更高效,更快地表示歡迎。
碼:
import os,sys,time
import curses
stdscr = curses.initscr()
begin_x = 5; begin_y = 5
height = 40; width = 40
def temp_raw(sensor_str):
f = open(sensor_str, 'r')
lines = f.readlines()
f.close()
return lines
def read_temp(sensor_str):
lines = temp_raw(sensor_str)
while lines[0].strip()[-3:] != 'YES':
lines = temp_raw(sensor_str)
temp_output = lines[1].find('t')
if temp_output != -1:
temp_string = lines[1].strip()[temp_output+2:]
temp_c = float(temp_string) / 1000.0
return temp_c
init = 1
timer = 0
search = 1
curses.noecho()
curses.curs_set(0)
subdirectories = []
old_nbr_of_subdirs = 1
nbr_of_subdirs = 1
old_subdirectories = []
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
while (1):
timer = timer + 1
while search == 1:
stdscr.addstr(10,30, "Searching for sensors");
subdirectories = os.listdir("/sys/bus/w1/devices/");
nbr_of_subdirs = len(subdirectories);
time.sleep(3)
if nbr_of_subdirs > old_nbr_of_subdirs:
stdscr.addstr(10,30, "Found %d new sensors " % (nbr_of_subdirs-old_nbr_of_subdirs));
stdscr.addstr(11,30, "Is this all sensors? (y/n)?");
stdscr.refresh()
c = -1;
while(c == -1):
c = stdscr.getch();
if c == ord('y'):
stdscr.addstr(10,30, " ");
stdscr.addstr(11,30, " ");
stdscr.refresh()
old_nbr_of_subdirs = nbr_of_subdirs;
init = 1;
search = 0;
timer = 0;
else:
stdscr.addstr(10,51 + timer, ". ");
timer = timer + 1;
timer = timer % 4;
stdscr.refresh()
if init == 1:
init = 0
alive_ticker = 0;
temp_list = [];
sensor_oldtemp = [0,0,0,0,0,0];
sensor_temp = [0,0,0,0,0,0];
active_sensor = [0,0,0,0,0,0];
sensors = 0;
alive_ticker = 0;
active = 2;
confirm = 0;
stdscr.addstr(17,0, "Number of subdirectories %d" % (len(subdirectories)));
removed = 0;
index = 0;
length_old_subdirs = len(old_subdirectories);
while (index < length_old_subdirs):
length_old_subdirs = len(old_subdirectories);
if old_subdirectories[index] in subdirectories:
subdirectories.remove(old_subdirectories[index]);
removed += 1;
index += 1;
else:
old_subdirectories.remove(old_subdirectories[index]);
index = 0;
stdscr.addstr(30,20, "Removed %d" % (removed))
stdscr.addstr(18,0, "Number of CUT subdirectories %d" % (len(subdirectories)));
stdscr.addstr(19,0, "Number of old_subdirectories %d" % (len(old_subdirectories)));
stdscr.addstr(13,20, "Press space to confirm active sensor!");
stdscr.addstr(14,20, "Press r to reset!");
for index in range(len(subdirectories)):
if subdirectories[index].find("28") != -1:
temp_list.append("/sys/bus/w1/devices/"+subdirectories[index]+"/w1_slave");
sensor_temp[sensors] = 0;
sensors = sensors + 1;
old_subdirectories = old_subdirectories + subdirectories;
temp_list.sort();
if confirm == 1:
stdscr.addstr(13,20, "Press space to confirm active sensor!");
stdscr.addstr(14,20, "Press r to restart!");
curses.halfdelay(1);
c = stdscr.getch();
if c == 32:
confirm = 0;
timer = 10
for z in range(sensors):
if active_sensor[z] > active:
stdscr.addstr(z+5,20, " " , curses.A_DIM)
active_sensor[z] = 100
stdscr.refresh()
elif c == ord('n'):
init = 1
continue
elif c == ord('r'):
for z in range(sensors):
active_sensor[z] = 1;
if (timer > 9):
timer = 0
nbr_active_sensors = 0
for y in range(sensors):
if 99 > active_sensor[y]:
nbr_active_sensors = nbr_active_sensors + 1;
sensor_temp[y] = read_temp(temp_list[y]);
if ((sensor_oldtemp[y] + 0.1) < sensor_temp[y]):
active_sensor[y] = active_sensor[y] + 1;
sensor_oldtemp[y] = sensor_temp[y]
stdscr.addstr(3,5, "nbr_active_sensors=%d" % (nbr_active_sensors))
stdscr.addstr(4,5, "sensors=%d" % (sensors))
if nbr_active_sensors == 0:
search = 1
timer = 0;
continue
for x in range(sensors):
if (99 > active_sensor[x] and active_sensor[x] > active):
confirm = 1
stdscr.addstr(x+5,20, "Sensor %d value %4.2f ID:%s : %d " % (x+1, sensor_temp[x], temp_list[x][20:-9], active_sensor[x]), curses.A_STANDOUT)
elif active_sensor[x] <= active:
stdscr.addstr(x+5,20, "Sensor %d value %4.2f ID:%s : %d " % (x+1, sensor_temp[x], temp_list[x][20:-9], active_sensor[x]))
stdscr.refresh()
alive_ticker = alive_ticker + 1
stdscr.addstr(2, 55, "Alive ticker: %6d" % (alive_ticker))
問題 :當您插入第三根電纜(帶有2-3個溫度傳感器)時,它不再能找到任何新的傳感器。
如果我沒記錯的話,電纜的極限為2 。 您是否已驗證硬件支持更多電纜?
我建議重寫代碼和代碼分成 UI,傳感器和導線部分。
例如:
class DS18B20(object):
...
def read(self):
...
class One_Wire(object):
def search(self):
print("Searching sensors")
...
def read(self):
print('Reading sensors')
for key in self.sensors:
self.sensors[key].read()
def refresh(self):
print("Refreshing sensors")
...
def history(self, alive=True):
print('Reading History')
...
用法 :
if __name__ == '__main__':
oWire = One_Wire()
oWire.search()
print(oWire)
oWire.refresh()
print(oWire)
oWire.read()
print(oWire)
history = oWire.history()
print(history)
輸出 :
Searching sensors
Sensors:5, active:5
id:i2c-0 CONNECT temp:None, id:i2c-3 CONNECT temp:None, id:i2c-1 CONNECT temp:None, id:i2c-5 CONNECT temp:None, id:i2c-6 CONNECT temp:None
Refreshing sensors
NEW Sensor:i2c-2
NEW Sensor:i2c-4
Sensors:7, active:6
id:i2c-0 CONNECT temp:None, id:i2c-2 CONNECT temp:None, id:i2c-3 CONNECT temp:None, id:i2c-1 disconnect temp:None, id:i2c-5 CONNECT temp:None, id:i2c-6 CONNECT temp:None, id:i2c-4 CONNECT temp:None
Reading sensors
Reading sensors
Reading sensors
Sensors:7, active:6
id:i2c-0 CONNECT temp:19, id:i2c-2 CONNECT temp:25, id:i2c-3 CONNECT temp:26, id:i2c-1 disconnect temp:None, id:i2c-5 CONNECT temp:25, id:i2c-6 CONNECT temp:18, id:i2c-4 CONNECT temp:30
Reading History
[{'i2c-0': [20, 27, 19]}, {'i2c-2': [30, 21, 25]}, {'i2c-3': [23, 29, 26]}, {'i2c-5': [30, 18, 25]}, {'i2c-6': [30, 21, 18]}, {'i2c-4': [24, 18, 30]}]
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