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Search: Posts Made By: Curious.George
Forum: General Electronics Technical Discussion 10-25-2020, 03:51 PM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

You don't need interrupts. In my example, you LIKELY would have them to provide the timing information. But, you could also implement delays using a real timer.

The point is that you can write...
Forum: General Electronics Technical Discussion 10-25-2020, 12:04 PM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

That's not the case with preemptive multitasking. And, many nonpreemptive systems can run "endless loops" as long as there is some transfer of control to the OS within that loop (i.e., any system...
Forum: General Electronics Technical Discussion 10-21-2020, 11:28 PM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

IIRC, the network drop comes in over fiber -- any sourced power would have to be available locally (in which case, why not let the MCU use it directly?)



That's been the case for many years,...
Forum: General Computer & Tech Discussion 10-20-2020, 12:13 AM
Replies: 4,715
Views: 733,585
Posted By Curious.George
Re: best cheap/free scores 1.1

Today, I recycled 6 Smart-UPS 1500s as a token offering to the "God of Equilibrium". I figure I still need to shed some more volume and mass. But, that was a good start.

What I really need to do...
Forum: General Electronics Technical Discussion 10-19-2020, 04:51 AM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

That's how a client-server system operates. The server exports a service. Clients make demands on that service.

DNS is a service. A client sends a request to the DNS server: "Give me the IP...
Forum: General Computer & Tech Discussion 10-18-2020, 07:27 PM
Replies: 4,715
Views: 733,585
Posted By Curious.George
Re: best cheap/free scores 1.1

Cripes! I'm a sucker for "free"... :spin: Time to see if there are any other things that I can add to my "scrap" pile to get rid of them, tomorrow!
Forum: General Electronics Technical Discussion 10-17-2020, 07:28 PM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

My point has to do with whether the end of the fiber is "the other end of the link" (dedicated between "switches" and "pump") or, just a "network drop"?

In the former case, you "own the wire" and...
Forum: General Electronics Technical Discussion 10-16-2020, 05:48 PM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

Presumably, the fiber is terminated into something "electronic" that presents a standard ethernet interface? Or, do you have to design hardware to support the optical transducers (presumably via...
Forum: General Electronics Technical Discussion 10-16-2020, 01:31 PM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

(sigh)

Sorry, I've lost track of what the desired goal of all of this is (and I'm not keen on reading 80 posts to sort it out!).

Think about what you are trying to do "in the abstract".
...
Forum: General Electronics Technical Discussion 10-16-2020, 02:36 AM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

I have no idea what their library supports. My (uninformed) opinion of these devices is that they aren't really intended for "serious" work.



"Eclipse" is pretty much the de facto IDE for most...
Forum: General Electronics Technical Discussion 10-15-2020, 05:26 PM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

A "server" is typically a single device. It can handle multiple clients, concurrently, using a number of different implementation mechanisms.

You would, thus, have a single node that exports a...
Forum: General Electronics Technical Discussion 10-15-2020, 12:37 PM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

You have to choose how your system configuration is managed.

Do you "tell" someone that there are N clients and they exist at the following IP addresses?

Is each client told of the identity of...
Forum: General Electronics Technical Discussion 10-15-2020, 12:32 PM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

You don't understand how protocol stacks work.

A TCP connection is defined by a 5-tuple:
(protocol, source IP, source port, target IP, target port)

A server can manage any number (depends on...
Forum: Troubleshooting Power Supplies and Power Supply Design 10-11-2020, 12:28 PM
Replies: 11
Views: 359
Posted By Curious.George
Re: Fwiw: Apc ups

I don't. Instead, I "pull" the MCUs from UPSs and decompile the code. They aren't particularly complex devices (the only complexity resides in the NMCs and understanding those isn't essential to...
Forum: General Electronics Technical Discussion 10-11-2020, 09:30 AM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

"Language support" is like advertising you have shiny hubcaps on your old klunker. The most powerful/effective programming tool is the environment supported by the "OS" (or, "RTOS" -- to use a often...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-10-2020, 01:55 PM
Replies: 6
Views: 201
Posted By Curious.George
Re: 100hmz vs 200mhz oscilloscope

Yup. I have a couple of 2G/s DSOs (500MHz b/w) but only use them to document waveforms (as a DSO, I can retrieve the contents of the waveform memory).

For more than 4 signals, I drag out a LA for...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-10-2020, 11:05 AM
Replies: 6
Views: 201
Posted By Curious.George
Re: 100hmz vs 200mhz oscilloscope

That depends on what sorts of problems you expect to be capable of diagnosing.

A power supply can probably be diagnosed with a 10 MHz 'scope. If you want to look at waveforms to/from a bank of...
Forum: General Computer & Tech Discussion 10-10-2020, 10:43 AM
Replies: 4,715
Views: 733,585
Posted By Curious.George
Re: best cheap/free scores 1.1

Apparently, this is "UPS week"...

Rescued one of these (https://www.apc.com/shop/us/en/products/APC-Smart-UPS-RT-2000VA-Rack-Tower-120V/P-SURTA2000RMXL2U) and one of these...
Forum: General Electronics Technical Discussion 10-08-2020, 01:12 AM
Replies: 133
Views: 1,754
Posted By Curious.George
Re: Remote pump control ideas.

I suspect the environment you're coding in is sorely crippled (single-threaded, etc.).

If you can afford to spin in a routine that just watches a button press, then the easiest way to do this is...
Forum: General Capacitor Questions & Issues 10-07-2020, 08:49 PM
Replies: 13
Views: 205
Posted By Curious.George
Re: Wanting To Try Something With Extra Capacitors for my original xbox

That depends on the characteristics of the power supply. Adding caps will make the circuit look like a lower impedance as power is applied. It's likely that the power supply will tolerate the...
Forum: Troubleshooting Power Supplies and Power Supply Design 10-06-2020, 08:54 PM
Replies: 11
Views: 359
Posted By Curious.George
Re: Fwiw: Apc ups

You can't "fix" the problem by tweaking the analog portion of the circuit. You need to add smarts to how (and when) you apply charging rules. You do that by tweeking the code in the microcontroller.
Forum: Troubleshooting Power Supplies and Power Supply Design 09-30-2020, 01:11 AM
Replies: 7
Views: 315
Posted By Curious.George
Re: What's this transformer for and how to find in on aliexpress?

How do you know the number of turns? Have you UNWOUND the core and counted? Or, is the transformer still operational and you observed the voltage gain?

[If operational, then why are you...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-29-2020, 06:43 PM
Replies: 17
Views: 461
Posted By Curious.George
Re: Shopping for a bench power supply, Advice?

Don't just come up with some numbers; sit down and "what-if" different scenarios and see how your needs might change. Then, look over the list of requirements and see if any of the outliers can be...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-27-2020, 10:29 PM
Replies: 11
Views: 359
Posted By Curious.George
Re: Fwiw: Apc ups

As I said, the RIGHT solution is for the UPS to "take notes" about the conditions its been operating in (after all, it is likely on 24/7/365!) and how often it encounters outages, how long they are,...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-27-2020, 06:51 PM
Replies: 11
Views: 359
Posted By Curious.George
Re: Fwiw: Apc ups

We rarely have outages. At times, we encounter "switching transients" as the utility changes how our portion of the network is fed. These are just "light blinks" but can crash some devices with...
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