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by W. H. Heydt
Mon Oct 15, 2018 2:23 am
Forum: General discussion
Topic: Give my RPi 3 a life please
Replies: 13
Views: 408

Re: Give my RPi 3 a life please

Without a screen, how do you propose that know the time?, make changes, shut the system down? Sure, you can use SSH, but who here SSHs into a wristwatch to see the time? The addition of a screen allows addition of other useful things like a calendar, media playback, scheduler, etc. Adding an RTC is...
by W. H. Heydt
Sun Oct 14, 2018 11:06 pm
Forum: General discussion
Topic: Give my RPi 3 a life please
Replies: 13
Views: 408

Re: Give my RPi 3 a life please

I'd do the alarm clock. You can make it fancy with nothing more than a small screen being required and maybe a cheap RTC module You don't need an RTC. Let it do periodic time checks from NTP servers. One doesn't need a screen, either. On the other hand, a set of speakers is pretty useful if you're ...
by W. H. Heydt
Sun Oct 14, 2018 4:58 pm
Forum: General discussion
Topic: How much current via USB ?
Replies: 12
Views: 383

Re: How much current via USB ?

I just checked my portable CD writer/DVD reader. It is rated for 2.0A. I've always used it with a powered hub. Wow, 2A! That must have come with its own power supply. It seems unlikely that was intended to be powered by USB alone. Unless it's a USB 3.0 drive that came with a "Y" cable with dual USB...
by W. H. Heydt
Sun Oct 14, 2018 1:51 am
Forum: General discussion
Topic: Suggestion for a Christmas Gift
Replies: 7
Views: 196

Re: Suggestion for a Christmas Gift

As regards the A+... It does have the benefits of full sized connectors and power protection circuits. I would say that the choice between a Pi0 and an A+ is narrower than some might think. It may also depend on *who* is going to be working with it as much as what the project is. Of course, I also t...
by W. H. Heydt
Sat Oct 13, 2018 8:55 pm
Forum: General discussion
Topic: Suggestion for a Christmas Gift
Replies: 7
Views: 196

Re: Suggestion for a Christmas Gift

I'll add my voice to the Pi3B+, for the already stated reasons.

That said, I note that you omitted the A+ from your list.
by W. H. Heydt
Sat Oct 13, 2018 4:29 pm
Forum: General discussion
Topic: How much current via USB ?
Replies: 12
Views: 383

Re: How much current via USB ?

I just checked my portable CD writer/DVD reader. It is rated for 2.0A. I've always used it with a powered hub.
by W. H. Heydt
Thu Oct 11, 2018 1:51 am
Forum: General discussion
Topic: under voltage detected
Replies: 19
Views: 377

Re: under voltage detected

if RPi1B+, RPiZ/W : use 5v 1.5A and up, cable must be 20AWG or at least 0.75mmsq if RPiA+ : use 5v 1.0A and up, cable must be 20AWG or at least 0.75mmsq I'm skeptical about that particular set of requirements. I tested a Pi0+3.5" display (GPIO mounted) and the whole thing drew less than 250mA, and ...
by W. H. Heydt
Wed Oct 10, 2018 7:17 pm
Forum: Beginners
Topic: NOOBS and SD Card concept
Replies: 4
Views: 95

Re: NOOBS and SD Card concept

Great thank you. The first time around I bought a pre-installed SD Card, mainly as I don't have a card reader and having never tried making the NOOBS image it all seemed to be doing too many new things at once. QUESTION 4 Can I clone the new SD Card from the first one? Raspbian Stretch with Desktop...
by W. H. Heydt
Wed Oct 10, 2018 3:58 pm
Forum: General discussion
Topic: I think I Crippled My Pi... :(
Replies: 11
Views: 353

Re: I think I Crippled My Pi... :(

The problem when people accidentally yank on cables is that they usually don't pull straight, so rather than just pulling the connector out it wedges the two halves of the connector together and puts considerable stress on the whole assembly. One approach I remember seeing on the original xbox was ...
by W. H. Heydt
Wed Oct 10, 2018 3:53 pm
Forum: General discussion
Topic: PowerPoint Presentation on 5" Touch Display
Replies: 4
Views: 103

Re: PowerPoint Presentation on 5" Touch Display

Side note... The suggestion to use the LibreOffice presentation module is a good one in part because...PowerPoint isn't going to run on the Pi.
by W. H. Heydt
Wed Oct 10, 2018 2:36 pm
Forum: General discussion
Topic: I think I Crippled My Pi... :(
Replies: 11
Views: 353

Re: I think I Crippled My Pi... :(

My father--who got his start pushing electrons circa 1930, while enlisted in the US Navy--always insisted that the proper way to pull any plug was to pull on the plug and *not* on the cord. That is still an ingrained habit with me...
by W. H. Heydt
Tue Oct 09, 2018 3:07 pm
Forum: Troubleshooting
Topic: Pi 3 Power Consumption issues
Replies: 2
Views: 92

Re: Pi 3 Power Consumption issues

An alternative (probably won't get you down to a total load under 1A) would be to use an earlier model of Pi. Pi2B boards use less power, and the B+ even less. That speaker is still going to be a problem, though, unless you drop down to an A+ or a Pi0/Pi0W.
by W. H. Heydt
Mon Oct 08, 2018 6:30 pm
Forum: Español
Topic: help raton y teclado en raspbian
Replies: 1
Views: 80

Re: help raton y teclado en raspbian

(Working off my wife's knowledge of Spanish, plus cognates among the technical terms.) Generally speaking, phone chargers make poor power supplies for Pis and they are often unable to maintain voltage under load. In addition, a 2A charger is on the weak side for a Pi3 (either Pi3B or Pi3B+), where t...
by W. H. Heydt
Mon Oct 08, 2018 6:17 pm
Forum: General discussion
Topic: Why sell a 7" screen?
Replies: 69
Views: 1609

Re: Why sell a 7" screen?

Do not make the assumption that all Pis are used as general purpose desktop computer. Indeed. Of all the--rather large number--of Pis I have, *none* of them are used as general purpose desktop machines. The closest any of them come to that are a half dozen Pi2Bv1.1 boards used as "workstations" to ...
by W. H. Heydt
Mon Oct 08, 2018 1:39 pm
Forum: General discussion
Topic: Why sell a 7" screen?
Replies: 69
Views: 1609

Re: Why sell a 7" screen?

Resolution is low on the old 7" they sell but it was 2015 when it came to market and I assume a least a year or so in development ?. More like 2 years, IIRC. Problems were encountered, and even then, on the very first ones you couldn't adjust the backlight. That feature came later with a controller...
by W. H. Heydt
Mon Oct 08, 2018 5:12 am
Forum: General discussion
Topic: Why sell a 7" screen?
Replies: 69
Views: 1609

Re: Why sell a 7" screen?

1. The display uses PWM for its backlight control. That's too bad. I'll have to steer clear of it then. If that's a problem, you probably have to stay away from *all* LED backlit screens. 6. I doubt we would release a LCD without a touchscreen. How about a e-ink display with a touch screen? Do you ...
by W. H. Heydt
Mon Oct 08, 2018 3:41 am
Forum: Troubleshooting
Topic: Force USB to boot
Replies: 2
Views: 75

Re: Force USB to boot

Unless you've already set the OTP bit for booting from a mass storage device, that's going to be rather hard to do. The best suggestion I can make is to get a Pi3B+, which has the bits set at the factory. For your existing Pi3B, find some with good eyes, steady hands and willing to replace the micro...
by W. H. Heydt
Mon Oct 08, 2018 3:23 am
Forum: General discussion
Topic: Why sell a 7" screen?
Replies: 69
Views: 1609

Re: Why sell a 7" screen?

5. Development of a new product takes quite a long time, especially ensuring supply chains are solid and manufacturing costs make the product cost effective. Not to mention that, because the way the Pi market appears to work, any new device requires parts that will stay in production for an extende...
by W. H. Heydt
Sun Oct 07, 2018 4:00 pm
Forum: Off topic discussion
Topic: R Pi in main-stream periodicals
Replies: 9
Views: 829

Re: R Pi in main-stream periodicals

... "mass circulation" ... "mass market" ... the awareness of the general population. Exactly what I was trying to say. Thank you for putting it more succinctly than I managed. And, yes, I'm disappointed that up till now it's been ignored by even those publications such as New Scientist that are su...
by W. H. Heydt
Sun Oct 07, 2018 3:44 pm
Forum: General discussion
Topic: where to buy rpi zero 1.3 for builing a cluster
Replies: 19
Views: 649

Re: where to buy rpi zero 1.3 for builing a cluster

The policy of "one to a customer" for the Pi0 at the "educational discount level" ($5) is set by the RPF. In theory, it's "one only per customer *ever*" and there is a supplier in at least one country that--by report--actually enforces that. If you want to buy more than one at a time, you have to mo...
by W. H. Heydt
Sun Oct 07, 2018 1:14 am
Forum: General discussion
Topic: Why sell a 7" screen?
Replies: 69
Views: 1609

Re: Why sell a 7" screen?

There are other issues though. Primary in my mind is the question of the essential mission of the Rpi foundation. If it is educational then its efforts shouldn't stagnate. If there is one thing about the RPF/RPT that I'm reasonably sure of, it's that they are not stagnating. Or to put it a more tra...
by W. H. Heydt
Sat Oct 06, 2018 9:58 pm
Forum: General discussion
Topic: Why sell a 7" screen?
Replies: 69
Views: 1609

Re: Why sell a 7" screen?

That doesn't mean it's perfect, doesn't preclude the potential for it being better, but it's certainly not doing badly for what it is. Yes the actual Pi 3B+ is not bad when used with a heatsink. I just hope they'll continue improving the display. 3 years putting out a small 800x480 display is long ...
by W. H. Heydt
Sat Oct 06, 2018 9:14 pm
Forum: Beginners
Topic: Install raspian jessie (does not start the image)
Replies: 3
Views: 81

Re: Install raspian jessie (does not start the image)

Hello everyone, I have installed raspian strench several times, without problems, now I need to install the raspian jessie, format the SD I record the IMG and the system does not start, the blackberri pi has the red LED with blinking of 4 short tones and 4 tones long (solution please?) Interesting ...
by W. H. Heydt
Sat Oct 06, 2018 9:09 pm
Forum: General discussion
Topic: Why sell a 7" screen?
Replies: 69
Views: 1609

Re: Why sell a 7" screen?

I can think of three developments that would please me (note that I'm not saying the RPF *should*, let alone *must*, use these features). Start with going OLED. Second, increase the resolution. Third, add a larger screen. Unless and until any of that happens (and it may not be in my lifetime), when...
by W. H. Heydt
Sat Oct 06, 2018 7:50 pm
Forum: Off topic discussion
Topic: R Pi in main-stream periodicals
Replies: 9
Views: 829

Re: R Pi in main-stream periodicals

Perhaps the OPs point might be better described as "mass circulation" (in that you can walk into a common sort of store in the country of origin--I used to have somewhere I could go to buy British computer magazines--and expect to see the publication available) or even just "mass market". "Periodica...

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