Am 05.08.20 um 00:39 schrieb Mick Sulley:
> 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
>
Triggering /temperature/simultaneous just sends "Skip ROM, Convert T" on
the bus.
If you never ever read .../<id>/temperature nodes, there's no waiting
time imposed by ofws. Reading /uncached/<id>/latesttemp reads the
current scratchpad from the sensor.
However, I'm not sure if the sensor itself imposes a waiting time for
reading the scratchpad while a conversion is active. In that case, owfs
would wait for it to respond.
>
> 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?
>
> #!/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()
>
>
I'm not too familiar with Python but this looks straightforward and okay.
From what you write it seems there's another process accessing the
sensors concurrently. Maybe a kernel driver? Check that first.
Kind regards
Jan
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