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On 22/09/2024 at 11:53, John Aldridge wrote:
> In article , news@druck.org.uk says...
>>
>> On 20/09/2024 11:17, John Aldridge wrote:
>> [Reading ds18b20 sensors in parallel]
>>> No, but AIUI the "right" way to do this is to send the text "trigger" to
>>> /sys/bus/w1/devices/w1_bus_master1/therm_bulk_read before reading the
>>> values as normal. The trigger causes them all to start a conversion at
>>> once, following which the reads all complete immediately once a single
>>> conversion time has elapsed.
>>>
>>> As a quick hack, try executing the following before reading your
>>> sensors...
>>>
>>> sudo su <>> echo trigger > /sys/bus/w1/devices/w1_bus_master1/therm_bulk_read
>>> EOF
>>
>> Thanks, that seems to works for the first bus, but I get a permission
>> denied when using w1_bus_master2.
>
> Sorry, I've no idea why that might be :(
>
> Though I do recall the permission checking being a bit odd -- hence the
> "sudo su" rather than a plain "sudo".
>
Have you tried
'echo trigger | sudo tee /sys/bus/w1/devices/w1_bus_master1/therm_bulk_read'
--
Chris Elvidge, England
HIGH EXPLOSIVES AND SCHOOL DON'T MIX
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