From: pcdhSpamMeSenseless@electrooptical.net
Jeroen Belleman wrote:
> On 12/26/25 11:37, Don Y wrote:
>> On 12/26/2025 3:27 AM, Liz Tuddenham wrote:
>>> Don Y wrote:
>>>
>>>> Any pointers regarding deployment of pressure sensors measuring
>>>> air pressure?ÿ I'm looking at nominally an inch of water
>>>> (pressure/vacuum)...
>>>
>>> Washing machine/diswasher water-level switches?
>>
>> No, I'm looking at pressures in air handling systems.
>>
>> In systems that I've designed previously, someone
>> else selected (very expensive!) transducers and
>> I just had to interface with them.
>>
>> But, those were industrial systems with dedicated
>> staff to keep them running, calibrated, etc.ÿ You
>> cared about the actual "numbers" from the sensors
>> because you were controlling "regulated" processes
>> and needed to document compliance/exceptions.
>>
>> I'm trying to leverage some of those algorithms but in a
>> cheaper consumer market where stuff "just has to work".
>> I don't care about numbers as much as *trends*, using
>> adaptive algorithms to sort out what's "normal" from
>> "indicating".
>>
>
> I've had some fun with teeny tiny BME280 sensors. They
> have a sub-1% absolute accuracy and enough resolution
> to detect the pressure change between your head and your
> feet. They measure temperature and humidity too. The
> interface is I2C.
>
> Jeroen Belleman
>
Of course they might be detecting the difference in the mean molecular
weight of the local atmosphere. ;)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC /
Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics
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