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by W. H. Heydt
Wed Aug 15, 2018 4:03 am
Forum: Off topic discussion
Topic: Good news.... Well, maybe...
Replies: 8
Views: 282

Re: Good news.... Well, maybe...

A good example of this can be seen in the SD and uSD cards the Pi uses. 16MB cards are impossible to find (except in my drawer of unused electronic junk) and anything less than 8GB is no longer manufactured due to the costs involved vs sales making their manufacture less than economical. Are you su...
by W. H. Heydt
Wed Aug 15, 2018 3:58 am
Forum: General discussion
Topic: Can I use USB OTG with a network share?
Replies: 1
Views: 49

Re: Can I use USB OTG with a network share?

No Pi board that incorporates a LAN chip can be a client device. The LAN chip is set to be a USB master only. All B-series Pi (B, B+, Pi2B (both versions), Pi3B, Pi3B+) have a LAN chip. Only boards with the SoC USB port directly accessible (Pi0, Pi0W, A, A+) can be USB client devices. Only boards wi...
by W. H. Heydt
Wed Aug 15, 2018 2:36 am
Forum: Beginners
Topic: How much server in a raspberry
Replies: 4
Views: 79

Re: How much server in a raspberry

What a great and clear response, thank you so much!!! I have a last questions. How can I now the SoC from my raspberry? I bought this one: https://www.amazon.fr/gp/product/B00STVN0K4/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 You can only guess from that link. If you mouse over the image of the PCB...
by W. H. Heydt
Wed Aug 15, 2018 12:45 am
Forum: Beginners
Topic: How much server in a raspberry
Replies: 4
Views: 79

Re: How much server in a raspberry

Well...you certainly won't damage the Pi by using "too much memory" or running too many programs. Things will just get slower, for a variety of reasons. One consideration here is which version of the Pi2B you have as the SoC was changed between the Pi2Bv1.1 and the Pi2Bv1.2, with the later being abo...
by W. H. Heydt
Tue Aug 14, 2018 11:12 pm
Forum: Off topic discussion
Topic: Good news.... Well, maybe...
Replies: 8
Views: 282

Re: Good news.... Well, maybe...

...where could they put it? Simple - take away the micro SDHC card slot & put it underneath.... ;) (We can dream........) Sounds more like a nightmare to me. Can you think of *any* feature--and, particulary, I/O feature--that has ever been removed from a Pi? (Not counting a completely new design th...
by W. H. Heydt
Tue Aug 14, 2018 4:39 pm
Forum: Off topic discussion
Topic: Good news.... Well, maybe...
Replies: 8
Views: 282

Re: Good news.... Well, maybe...

That'd be nice - 4GB ram & a big internal mSATA. :D Prices would have to *really* crash for it to be good economics to put 4GB DRAM on a Pi (and, let me add, it wouldn't be possible for any Pi prior to the Pi4, and maybe not even then). 2GB, should the next SoC support it is far, far more likely. H...
by W. H. Heydt
Tue Aug 14, 2018 4:28 pm
Forum: General discussion
Topic: Can I connect my raspberry Pi to my laptop to increase performance?
Replies: 11
Views: 260

Re: Can I connect my raspberry Pi to my laptop to increase performance?

Totally ludicrous idea, the RPi is a Small Board Computer, not an add-on. It's not totally ludicrous. The Pi is both a small computer in its own right and an add-on, particularly when used as a USB gadget, or even networked. Going to be a real problem trying to get a Pi3B+ to run in gadget mode. A ...
by W. H. Heydt
Tue Aug 14, 2018 4:24 pm
Forum: General discussion
Topic: Can I connect my raspberry Pi to my laptop to increase performance?
Replies: 11
Views: 260

Re: Can I connect my raspberry Pi to my laptop to increase performance?

The Pi (unless a 3B+) will probably not boot without a uSD card. The Pi3B and Pi2Bv1.2 (and the CM3/CM3L, for that matter) can have the OTP bit set to permit booting from a USB connected mass storage device. The difference with the Pi3B+ is that it can be done "out of the box", as the bit is set at...
by W. H. Heydt
Tue Aug 14, 2018 6:10 am
Forum: General discussion
Topic: pi zero w in quantities of 10...50
Replies: 72
Views: 7199

Re: pi zero w in quantities of 10...50

Fyi, it is still 1 per customer. Use a different vendor. That doesn't solve the problem, it merely ignores it. Its like using deodorant to mask the smell of something bad. Or, for a Pi related analogy, its like disabling the low voltage indicator instead of fixing the power supply. If the agreement...
by W. H. Heydt
Tue Aug 14, 2018 4:48 am
Forum: General discussion
Topic: How does the forum search work?
Replies: 11
Views: 300

Re: How does the forum search work?

... but what order are they in? One of the unsung characteristics of relational databases is that you cannot predict the order of the rows returned unless you specify an order. I have seen experienced programmers get tripped up over this. I would not expect a search engine to sort items in any sort...
by W. H. Heydt
Tue Aug 14, 2018 3:55 am
Forum: General discussion
Topic: pi zero w in quantities of 10...50
Replies: 72
Views: 7199

Re: pi zero w in quantities of 10...50

mikronauts wrote:
Tue Aug 14, 2018 2:11 am
Fyi, it is still 1 per customer.

Too bad, I designed a really nice smt robot controller board for the 0w months ago same size as the 0), but with restricted 0w sales it is not viable to take to production.
Use a different vendor.
by W. H. Heydt
Tue Aug 14, 2018 3:53 am
Forum: General discussion
Topic: Can I connect my raspberry Pi to my laptop to increase performance?
Replies: 11
Views: 260

Re: Can I connect my raspberry Pi to my laptop to increase performance?

Think about this very carefully... Connecting a Pi without an SD card to your laptop is the very same thing as connecting a second laptop that doesn't have a disk drive (either SSD or HDD) in it. How do you think that would work? Do you think that two laptops 9one without a way to boot) would be fas...
by W. H. Heydt
Mon Aug 13, 2018 5:19 pm
Forum: Off topic discussion
Topic: Good news.... Well, maybe...
Replies: 8
Views: 282

Good news.... Well, maybe...

This article https://www.theregister.co.uk/2018/08/13/flash_price_crash_coming_round_the_oversupplied_block/ is worth a read. Analysts are predicting a price crash in flash memory from about $0.30 per GB to around $0.08 per GB. Some also think that as flash prices drop, some of the capacity will shi...
by W. H. Heydt
Mon Aug 13, 2018 4:56 pm
Forum: Python
Topic: Cron job not running
Replies: 2
Views: 67

Re: Cron job not running

also as cron runs programs in the background you will see no output from your program, if you want your program to display data on the screen then cron is not the way to do it. That is not actually true. You *can* have a cron job output to the screen. You just need to set it up in your script. Here...
by W. H. Heydt
Sat Aug 11, 2018 7:59 pm
Forum: Beginners
Topic: cheap screen that won't block gpio pins
Replies: 3
Views: 123

Re: cheap screen that won't block gpio pins

That's an odd way of defining "unusable." I have a couple of Pis with 3.5" displays that mount on the GPIO header and I have no trouble using those Pis in the way I intend. I should point out that the 3.5" screen that I use have "pass through" on the GPIO pins that the display doesn't use. One of th...
by W. H. Heydt
Sat Aug 11, 2018 5:43 pm
Forum: Beginners
Topic: Advice on which model of the Pi and components to get.
Replies: 9
Views: 222

Re: Advice on which model of the Pi and components to get.

I may get one of these then. There's no way anything gets through pvc at any pressure, not to mention merely a few atmospheres. The cable should merely get slightly squeezed together. That's just stock CAT-5e. The specs as shown on the site say nothing at all about water resistance. I think you're ...
by W. H. Heydt
Sat Aug 11, 2018 5:38 pm
Forum: Beginners
Topic: i am unable to set up my raspberry pi
Replies: 2
Views: 89

Re: i am unable to set up my raspberry pi

Start with this thread:
viewtopic.php?f=28&t=58151

This one may be useful as well:
viewtopic.php?f=91&t=83372
by W. H. Heydt
Sat Aug 11, 2018 6:14 am
Forum: Beginners
Topic: Problems with maria db
Replies: 3
Views: 89

Re: Problems with maria db

Having thought about this some more, I would point out that replacing MySQL with mariadb isn't the only change. The OS version is different, and there may have been changes to the Python language processor as well. All of that said--and repeating that I don't know Python: I see that you are passing ...
by W. H. Heydt
Sat Aug 11, 2018 5:21 am
Forum: Beginners
Topic: Problems with maria db
Replies: 3
Views: 89

Re: Problems with maria db

I suspect this may be more of a Python issue than a mariadb issue. Using the single-quotes in the VALUES list turns it into a literal (hence getting "%s" inserted into the database. What little I know of Python is that it is very sensitive to indentation, so check that carefully. What I would sugges...
by W. H. Heydt
Sat Aug 11, 2018 5:04 am
Forum: General discussion
Topic: [advice] Dual HDMI Screens on one (or two pi's)
Replies: 3
Views: 115

Re: [advice] Dual HDMI Screens on one (or two pi's)

The answer isn't completely clear cut. It depends--in part--on whether or not the displays *have* to be HDMI. It also depends on how big the displays need to be. Every Pi except the Pi0/Pi0W also has a DSI connector to which the 7" RPF touch screen can be attached. The is a beta test going on at the...
by W. H. Heydt
Fri Aug 10, 2018 11:56 pm
Forum: Beginners
Topic: Advice on which model of the Pi and components to get.
Replies: 9
Views: 222

Re: Advice on which model of the Pi and components to get.

Well the outside plastic along the cable ought to be waterproof and the connectors aren't going to be outside the pressure hulls. The link through the hull is actually pretty straightforward to seal thoroughly. In the ordinary course of things "waterproof" doesn't mean "waterproof under pressure". ...
by W. H. Heydt
Fri Aug 10, 2018 11:52 pm
Forum: Beginners
Topic: Advice on which model of the Pi and components to get.
Replies: 9
Views: 222

Re: Advice on which model of the Pi and components to get.

I'd second the Pi2b, it seems like the best choice for your use. A decent battery will still be required, but the Pi2b uses less power, so isn't as difficult to find, as it is for a Pi3b. A USB powerbank with 2.4A @5v or more available should work fine. Actually...for a Pi2B, 2A is adequate, even w...
by W. H. Heydt
Fri Aug 10, 2018 4:50 pm
Forum: Beginners
Topic: Advice on which model of the Pi and components to get.
Replies: 9
Views: 222

Re: Advice on which model of the Pi and components to get.

Well...you could use a Pi0/Pi0W and an external USB hub. You could even use a passive hub. I've done that with one connecting to keyboard, mouse, Ethernet adapter, and a WiFi dongle. Another alternative you could look at would be the Pi2B, which has lower power requirements than the Pi3B/Pi3B+. Or e...
by W. H. Heydt
Fri Aug 10, 2018 4:38 pm
Forum: General discussion
Topic: RaspiCam lens for optical zoom
Replies: 6
Views: 3085

Re: RaspiCam lens for optical zoom

You can even get adapters from CS-mount to C-mount or SLR-type mounts, but those lenses would likely be overkill. I will have to investigate... I've wanted to attach my 4" F2.7 C-mount lens (it goes with a 16mm cine camera) for a while. A support mount may be a bit of an issue.... I also have a 63m...
by W. H. Heydt
Fri Aug 10, 2018 5:07 am
Forum: Other projects
Topic: raspi as a... intercom?
Replies: 2
Views: 98

Re: raspi as a... intercom?

Welcome to the forums. I find your post a bit unclear. In the thread title, you say you want to build an intercom, but in the post you want to build a pager. Either (or both) is certainly possible. What sort of programs do you intend to use? A web browser? E-mail? IM clients? VOIP? And, by the way.....

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