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Daniel James  wrote:
> On 18/11/2025 12:08, The Natural Philosopher wrote:
> > As part of my enhancements to the home controller, I want to send email 
> > warnings of low heating oil level.
> 
> This sounds rather like something I have been planning to do. AAMOI how 
> are you measuring the oil level?

FWIW I had one of those Watchman ultrasonic oil tank sensors and I could
pick up the reading via rtl_433 and a cheap RTL2832-based DVB TV dongle.
(as well as the tyres on the car, and various other gizmos locally).

Perhaps a wires-free option if you already have such a sensor?

Theo

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