Re: smart plugs???

On 18/01/2025 02:46, Paul wrote:

On Fri, 1/17/2025 11:48 AM, Mike Scott wrote:

On 16/01/2025 13:25, Alan K. wrote:

If you're up to a bit of wiring, try a USB relay. E.g. Annadue Relay Module (try Amazon, 2 channel £10.62)
Interface: apt install usbrelay
usbrelay --debug for information
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1, 2, 3, 8 channels available
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https://www.amazon.com/DSD-TECH-SH-UR01A-Controller-Computer/dp/B09PYML6Q7
That's the coolest.  Damn! I wish I had that back when!   Of course Linux Mint and good computers etc weren't available when I was a huge DIYer and tinkered, but it really would have been fun.

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Nice idea... but I'm looking at probably 3kW at 240V to run a heater.
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The power level is just a bit outside my comfort zone for home construction, especially for unattended operation.
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It's why I'm trying to find a commercial solution.

 You can use a relay, to switch a relay.
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No need., You can use a transistor to buffer a PIO output and drive a sensibly big relay directly
I sourced some 20A 250V relays from china that seem OK
JQX-15F-DC05V-A 4PIN
Is the magic keyword.
They take about a watt (200mA@5V) to drive them - beyond most PIO (16mA=80mW for the pico) but easily obtainable with a single transistor amplifier.
Strangely Europe doesn't make shit like this - you end up with massive contactors at a huge price instead.
--
“The urge to save humanity is almost always only a false face for the urge to rule it.”
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