Hi Marcus,
With each eMail I gain a bit more understanding! And yes, I am enjoying
learning Python:)
I have played with it directly in a terminal and yes I understand now
what is happening and it works fine. However my test script seems to be
running too fast, so I suspect that it is still caching. Could you have
a look at my code and see if I have the use_cache(0) statement in the
right place.
One further question, with this code I can now unplug a sensor while the
code is running, it shows that it is unplugged (present = 0) and if I
plug it in again it sees it and displays the values again. My problem
now is that I would like it to recover like that even if the sensor is
missing when the code starts to run. Currently it starts up OK and
shows that the sensor is missing, but if I connect it it is still not
recognised. Is there a way to achieve this?
Thanks
Mick
#!/usr/bin/python
# file sen_object2.py
from pyowfs import Connection
import sys, time
"""
these are my test sensors
Family = 10 id = 2054A9010800 Powered = 0 Present = 1 Family =
10 Address = 102054A901080020 Type = DS18S20 Temperature =
23.625
Family = 10 id = 522FA9010800 Powered = 0 Present = 1 Family =
10 Address = 10522FA9010800CB Type = DS18S20 Temperature =
24.625
Family = 28 id = C0617A020000 Powered = 0 Present = 1 Family =
28 Address = 28C0617A020000A1 Type = DS18B20 Temperature =
28.375
Family = 28 id = F26D7A020000 Powered = 0 Present = 1 Family =
28 Address = 28F26D7A02000003 Type = DS18B20 Temperature =
25.0625
"""
connection = Connection ("/dev/ttyD0")
class SenObject:
"""Sensor object - """
def __init__(self, a = None, b = None, c = None):
self.id = a
self.code = b
self.description = c
try:
self.sensor = connection.find (id = self.id)[0]
self.sensor.use_cache(0)
except IndexError:
print 'Index Error in __init__'
def temp(self):
t = -9.99
try:
t = self.sensor.get ("temperature")
except (AttributeError, KeyError):
print 'AttributeError or KeyError'
return t
def family(self):
pass
def present(self):
p = 0
try:
p = self.sensor.get ("present")
except (AttributeError, KeyError):
print 'AttributeError or KeyError'
return p
def powered(self):
pass
# end of sens_object
w = SenObject('F26D7A020000', 'wCode', 'this is wcode')
x = SenObject('522FA9010800', 'xCode', 'this is xcode')
y = SenObject('2054A9010800', 'yCode', 'this is ycode')
z = SenObject('C0617A020000', 'zCode', 'this is zcode')
loop = 1
while loop > 0:
for s in [w, x, y, z]:
if s.present() == 0:
print '#################### not present ###############= ',
s.present()
else:
print 'present = ', s.present()
print 'id = ', s.id
print 'temp = ', s.temp()
print 'code = ', s.code
print 'description = ', s.description
print '####### Loop count is ####### ', loop
loop += 1
time.sleep(0.1)
------------------------------------------------------------------------------
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