I based my code on a mail from Jan 13/3/2020 which said the best way was
$ owwrite /simultaneous/temperature 1
$ sleep 1s
$ owread /uncached/<sensor0id>/latesttemp
$ owread /uncached/<sensor1id>/latesttemp
$ owread /uncached/<sensor2id>/latesttemp
I was thinking that the problem may be with my Python code, but I have
just tried it with a bash script and writing to simultaneous/temperature
make no difference. I have tried it reading latesttemp and also
temperature.
I am really confused now.
Mick
On 05/08/2020 09:15, Martin Patzak wrote:
... actually I checked my current code and I saw, that I do not read
/latesttemp, but read from /uncached/id/temperature
so reading from /uncached does not trigger a new conversion. Only when
you read a second time without triggering /simultaneous
I also saw that I increased the wait after issuing /simulataneous
command to 2 seconds, so I must have had issues at the time...
On 05.08.20 09:23, Martin Patzak wrote:
Hi Mick,
by reading the /uncached value, you are causing a new conversion.
Read only /latesttemp and it should work fine.
here is my test program, when I first tested simultaneous and pyownet:
import time
from pyownet import protocol
op = protocol.proxy("razmaban",port=4304)
error = 0
error_old = None
while True:
op.write('/simultaneous/temperature', '1')
time.sleep(1) # give the sensors time to convert their temps
print '...'
sensed = op.read('/28.676A20060000/latesttemp')
print sensed
sensed = op.read('/28.DD5915020000/latesttemp')
print sensed
Marty
On 05.08.20 00:39, Mick Sulley wrote:
Running v3.2p3 on Raspberry Pi, I have set up some DS18B20 sensors
on a test system, all of them are powered, but simultaneous does not
seem to be working
The code is below, when I run it the first loop takes 16 seconds
then it loops at 3 seconds for a while, then a 16 second etc. so it
looks like it does slow individual conversions, then uses cached
values until they expire, then another slow individual conversion,
etc. Have I got something wrong here?
Thanks
Mick
#!/usr/bin/python3
# sensor_read.py
import pyownet
import time
def main():
owp = pyownet.protocol.proxy()
while True:
start = time.time()
owp.write('/simultaneous/temperature', b'1')
time.sleep(1)
print('start of sensor_read.py')
sen_lst = ['Solar_Pnl_1A', 'Solar_Pnl_2A','Solar_Pnl_1B',
'Pool_Sol_X', 'Pool_CH_X', 'DHW_Mid_Top', 'DHW_Mid_Btm',
'DHW_Top','Temp5', 'Temp19', 'Temp20','Temp21', 'Temp22', 'Temp23',
'Temp25', 'Temp26', 'Temp27', 'Temp29', 'Temp30']
prop_lst = ['/type', '/power', '/latesttemp']
for p in prop_lst:
print('%s ' %p, end = '')
print('')
for sen in sen_lst:
print('\n%s ' %sen, end = '')
for prop in prop_lst:
try:
print('%s ' %(owp.read('/uncached/' + sen +
prop).decode()), end = '')
except:
print('failed! ', end = '')
endt = time.time() - start
print('\nTime = %f' %endt)
if __name__ == "__main__":
main()
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