[clug] remote power cycling many machines

Robert Edwards bob at cs.anu.edu.au
Sun Apr 5 00:39:16 UTC 2020

On 5/4/20 9:57 am, Alastair D'Silva via linux wrote:
>> -----Original Message-----
>> From: linux <linux-bounces at lists.samba.org> On Behalf Of Chris Smart via
>> linux
>> Sent: Sunday, 5 April 2020 8:54 AM
>> To: linux at lists.samba.org
>> Subject: Re: [clug] remote power cycling many machines
>> On Sun, 5 Apr 2020, at 08:47, Chris Smart via linux wrote:
>>> On Sun, 5 Apr 2020, at 08:42, Chris Smart via linux wrote:
>>>> On Sun, 5 Apr 2020, at 08:14, Robert Edwards via linux wrote:
>>>>> On 4/4/20 11:06 pm, Chris Smart via linux wrote:
>>>>>> On Sat, 4 Apr 2020, at 20:11, Robert Edwards via linux wrote:
>>>>>>> What have others tried/can recommend?
>>>> ESPHome also supports those ethernet shields I mentioned (LAN8720),
>>>> if you do choose to go that way.
>>>> Like this:
>>>> https://www.sparkfun.com/products/765
>>>> Which might come cheaper on Amazon:
>>>> https://www.amazon.com.au/Mustwell-ENC28J60-Interface-Network-
>> Ethern
>> et/dp/B07G87619P/ref=sr_1_12?keywords=ENC28J60&qid=1586039079&sr=
>> 8-1
>>>> 2
>>> Sorry I was wrong. The ESP32 actually has a built in MAC so you could
>>> build your own by adding a PHY (like the LAN8720 or TLK110), which is
>>> what ESPHome supports. There might be a shield for that ready to go,
>>> but it's not the ENC28J60 one I linked before.
>> Like this, US$3, which is much cheaper than the ESP8266 Ethernet shields,
>> thanks to the ESP32's built in MAC.
>> https://www.electrodragon.com/product/lan8720-ethernet-breakout-
>> board-phy/
>> -c
> If a hardwired solution is what you want, I have a 16 channel SSR controller
> design, that speaks 1-Wire. Support is via OWFS.
> https://github.com/InfernoEmbedded/onewire-softdevice
> Hardware is minimal, and should cost <$10/unit in small quantities. It's
> built around an STM32 micrcontroller, with a handful of supporting parts,
> voltage regs, static suppression, RJ45 jacks and a handful of passives. I've
> got blank PCBs & most parts for them already. You'll need to be able to deal
> with SMD soldering to assemble them.
> Output is 0-3.3V, which can drive solid state relays or low power mosfets.
> For PCs, a mosfet pulling the reset or power switch lines to ground will
> substitute for a button press.

Thank Alastair (and Chris).

I am not really looking for the cheapest possible option to solve this,
esp. if it will end up costing much of my time I'd rather be spending
doing something more useful. The ANU does (still) have funds and can
afford to buy COTS or enterprise solutions.

I was just looking for some options that others have tried and have
received an abundance of good options to look at. Thanks to all who
have responded (so far).

Bob Edwards.

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