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From: druck <news@druck.org.uk>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: 1-wire behaviour on Bookworm
Date: Mon, 23 Sep 2024 12:17:01 +0100
Organization: A noiseless patient Spider
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On 22/09/2024 12:45, Chris Elvidge wrote:
> On 22/09/2024 at 11:53, John Aldridge wrote:
>> In article <vckmfh$17vkc$2@dont-email.me>, news@druck.org.uk says...
>>>
>>> On 20/09/2024 11:17, John Aldridge wrote:
>>> [Reading ds18b20 sensors in parallel]
>>>> sudo su <<EOF
>>>> echo trigger > /sys/bus/w1/devices/w1_bus_master1/therm_bulk_read
>>>> EOF
>>>
> 
> Have you tried
> 'echo trigger | sudo tee /sys/bus/w1/devices/w1_bus_master1/therm_bulk_read'
> 

Yes, that works for bus 1, but not bus 2 on that Pi 4.

On a Pi Zero 2W with 2 w1 buses, bus 1 gives the Permission denied error 
and bus 2 succeeds.

On a Pi 3B+ with 4 w1 buses, 1 and 2 succeed, 3 and 4 fail.

Very strange.

---druck