On 9/8/22 18:03, Chris Albertson wrote:
I did not know about these. Thanks so much for posting. So, after the
software stops cycling the output pins, the 10 uf cap discharges through
750 Ohm the opto-isolator's LED and the relay opens. I will have to
calculate the time delay, but my back of the envelope says about 0.02
seconds. Is that close to what you observe? Or did I miss a decimal place?
It looks like you have a good design and if you can sell these at a
reasonable price they should be standard equipment.
But I was thinking, Now that we have companies like JLCPCB who can make
printed circuit boards and solder components for well under $1 per PCB, I
would not want to be in the business of making and selling small electronic
devices. I would design this thing so that it used only parts from
JLCPCB's "short list" to keep the cost under $1. Post the design files and
let people order their own directly from the manufacturer.
An interesting idea. Any idea of the delay to expect after they receive
the order and the
payment?
How about what most folks call NRE?
My concern with this is that it does not catch a failure where only the
user space program crashes and the kernel-space task continues to run.
Perhaps something else can watch for this?
I have not ever observed that. Not saying it cannot happen, but based
on my experience,
someplace between pretty slim and point triple ought zip.
On Thu, Sep 8, 2022 at 2:15 PM <m...@mattshaver.com> wrote:
On 2022-09-08 15:55, andy pugh wrote:
I rely on the Mesa watchdog. If I was running a system that couldn't
do that then I would start looking t watchdog circuits, though last
time I looked I didn't see anything that simply opened a relay if the
charge pump stopped.
I actually make this:
http://www.mattshaver.com/site.php?link=pcbs/cp2estop/index.htm
It was used in Smithy machines and I have a bunch of them left. Haven't
sold one in years and don't know what they should cost anymore, but if
someone needs one I could look into it! :)
Thanks,
Matt
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