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by W. H. Heydt
Thu Feb 20, 2020 12:24 am
Forum: General discussion
Topic: PI Power - Commercial battery source
Replies: 20
Views: 412

Re: PI Power - Commercial battery source

I don't know of any off the shelf UPSes with Lithium batteries, and if there were, they'd probably be rather expensive. I have two lithium UPS, one right here beside me and another at work. And if you know me you might guess they did not cost an arm and a leg. Also own many bike and a couple car pa...
by W. H. Heydt
Wed Feb 19, 2020 9:17 pm
Forum: General discussion
Topic: use pi as network bridge?
Replies: 2
Views: 48

Re: use pi as network bridge?

All you really need is a switch, and that costs less than almost any Pi. E. g. https://www.monoprice.com/product?p_id=15760 or you could go "expensive" if you need GbE... https://www.monoprice.com/product?p_id=15762
by W. H. Heydt
Wed Feb 19, 2020 7:25 pm
Forum: Troubleshooting
Topic: RPI 4 Boot up and USB
Replies: 4
Views: 125

Re: RPI 4 Boot up and USB

dracon77 wrote:
Wed Feb 19, 2020 7:16 pm
USB C
50/60 Hz .8a
.5v 3000mA

https://www.amazon.com/gp/product/B07W5 ... UTF8&psc=1
According to the listing, the PSU is 5v (not 0.5v), which is what the Pi needs. It is *not* however an RPF PSU.
by W. H. Heydt
Wed Feb 19, 2020 7:18 pm
Forum: General discussion
Topic: PI Power - Commercial battery source
Replies: 20
Views: 412

Re: PI Power - Commercial battery source

I think those who recommend lead acid batteries instead of lithium are the same guys who use bipolar transistors where MOSFETs do much better job. YOU KNOW WHO YOU ARE!!! lol Depends on the use... I don't know of any off the shelf UPSes with Lithium batteries, and if there were, they'd probably be ...
by W. H. Heydt
Wed Feb 19, 2020 5:26 pm
Forum: Advanced users
Topic: high bandwidth radio module
Replies: 2
Views: 82

Re: high bandwidth radio module

Depending on the range you want, and what sort of robot it is, you could set the robot up with a steerable antenna and have if turn towards the the PC to get the best signal, and--thus--the longest range. You could label the tracking hardware "AE-35". Keep a spare in case of failure.
by W. H. Heydt
Wed Feb 19, 2020 5:21 pm
Forum: Beginners
Topic: Supported SSD Solutions ?
Replies: 5
Views: 156

Re: Supported SSD Solutions ?

Then, of course, there are the CM3L and CM3L+... I always assume people aren't referring to the CM, unless they specifically mention it. I'm never sure how many general users even know the CMs exist, let alone what they are and what they (or cannot) do. But in this case, both the CM3L and CM3L+ can...
by W. H. Heydt
Wed Feb 19, 2020 3:51 pm
Forum: General discussion
Topic: PI Power - Commercial battery source
Replies: 20
Views: 412

Re: PI Power - Commercial battery source

Perfect! Also remember that you can only have two powerpacks (at most 20000mA) in your hand luggage. Nothing is allowed in your luggage. I would grab one of these plus perhaps a smaller for your phone that can be used for the Pi as well. At least in the US, the limit it 100Wh, which is closer to 30...
by W. H. Heydt
Wed Feb 19, 2020 2:47 pm
Forum: Beginners
Topic: Where to buy genuine Raspberry Pi 4B?
Replies: 17
Views: 362

Re: Where to buy genuine Raspberry Pi 4B?

ejolson wrote:
Wed Feb 19, 2020 6:51 am
I find it somewhat surprising raspberry pies are not sold at Fry's Electronics. After all, they started as a grocery.
Fry's has, at times, carried Pis. Also, Fry's Electronics was started by the sons of the man who started the grocery chain, but it is not a direct derivative.
by W. H. Heydt
Wed Feb 19, 2020 2:42 pm
Forum: General discussion
Topic: PI Power - Commercial battery source
Replies: 20
Views: 412

Re: PI Power - Commercial battery source

For a Pi3B+ (which will--potentially--need 2.5A), I'd pick this https://www.monoprice.com/product?p_id=39749 or this https://www.monoprice.com/product?p_id=39750 .
by W. H. Heydt
Wed Feb 19, 2020 6:43 am
Forum: Beginners
Topic: Internet shortcuts on the desktop ...
Replies: 11
Views: 15891

Re: Internet shortcuts on the desktop ...

ankith26 wrote:
Wed Feb 19, 2020 6:15 am
Not anymore.
BTW why is this not locked.
I'm beginning to wonder if there are people *trying* to set a necro record.
by W. H. Heydt
Wed Feb 19, 2020 6:05 am
Forum: Beginners
Topic: Where to buy genuine Raspberry Pi 4B?
Replies: 17
Views: 362

Re: Where to buy genuine Raspberry Pi 4B?

But there exist various resellers of the pi, all of them sell the pi without any modifications (maybe in a different cover or box). You will see thousands of pi kits, and if they tell “pi included” they are obviously giving the original pi. There is one caveat to that... Element 14 runs a "custom P...
by W. H. Heydt
Wed Feb 19, 2020 5:54 am
Forum: Beginners
Topic: Where to buy genuine Raspberry Pi 4B?
Replies: 17
Views: 362

Re: Where to buy genuine Raspberry Pi 4B?

Thanks for the suggestions. What is the different between the Pi 4B sold in https://www.raspberrypi.org/products/ra ... 4-model-b/ and seeedstudio? Is the well-known seeedstudio making their own implementation? I have used Arduino and Beaglebone. I think several companies make their own implementat...
by W. H. Heydt
Wed Feb 19, 2020 5:19 am
Forum: Beginners
Topic: Supported SSD Solutions ?
Replies: 5
Views: 156

Re: Supported SSD Solutions ?

HawaiianPi wrote:
Wed Feb 19, 2020 4:00 am
The only models that can boot from USB with no card installed are the 3B, 3B+ and 2Bv1.2.
Hasn't there been some success with the Pi3A+? Then, of course, there are the CM3L and CM3L+...
by W. H. Heydt
Wed Feb 19, 2020 5:17 am
Forum: Beginners
Topic: Where to buy genuine Raspberry Pi 4B?
Replies: 17
Views: 362

Re: Where to buy genuine Raspberry Pi 4B?

Hi, where are some of the good places to buy genuine Raspberry Pi 4B and related products in the US and Canada? Will 4B+ be out soon? My favourite place is Micro Center. https://www.microcenter.com/ In fact, my opinion is that Micro Center is one of the top US tourist attractions, rivaled only by a...
by W. H. Heydt
Wed Feb 19, 2020 5:15 am
Forum: Beginners
Topic: Where to buy genuine Raspberry Pi 4B?
Replies: 17
Views: 362

Re: Where to buy genuine Raspberry Pi 4B?

...am yet to find any report of fake RPi4B models appearing in the market..... so almost always the ones that we get are genuine.... I know of only one serious attempt (as in somewhere between 500 and 5000 got made, depending on differing reports) to actually clone a Pi, and that was during the Pi1...
by W. H. Heydt
Wed Feb 19, 2020 2:28 am
Forum: Beginners
Topic: Supported SSD Solutions ?
Replies: 5
Views: 156

Re: Supported SSD Solutions ?

Is there any SSD solution that enables you to boot on a SSD disk ? Depends on how you mean that, and which model of Pi you're talking about. The Pi2Bv1.2 and Pi3B can boot from a USB device if you set an OTP (One Time Programming) bit. The Pi3B+ comes with the bit set, so it will boot from a USB de...
by W. H. Heydt
Wed Feb 19, 2020 2:23 am
Forum: Beginners
Topic: Where to buy genuine Raspberry Pi 4B?
Replies: 17
Views: 362

Re: Where to buy genuine Raspberry Pi 4B?

raspberry_user wrote:
Wed Feb 19, 2020 12:58 am
Will 4B+ be out soon?
What makes you think there will ever be a Pi4B+, let alone soon?
by W. H. Heydt
Wed Feb 19, 2020 2:22 am
Forum: Beginners
Topic: Is the Pi4 ARMv8 compliant ?
Replies: 3
Views: 111

Re: Is the Pi4 ARMv8 compliant ?

ScarFez wrote:
Wed Feb 19, 2020 12:21 am
Is the Pi4 ARMv8 compliant ?
Or can it be made compliant ?
What do you mean by "compliant"? The Pi4B SoC--BCM2711--has 4 ARM Cortex-A72 cores. How could it possibly NOT be "ARMv8 compliant"?
by W. H. Heydt
Wed Feb 19, 2020 2:19 am
Forum: General discussion
Topic: Can i upgrade LPDDR4 4GB or 8GB form RPi4 (2GB)?
Replies: 8
Views: 346

Re: Can i upgrade LPDDR4 4GB or 8GB form RPi4 (2GB)?

There are several promotions on Raspberry Pi 4 kits now in Canada. I am curious to see what will happened with any potential upgraded Raspberry Pis. I currently have a Raspberry Pi 3B+ which I used primarily as a media server. However, I am eager to purchase a new Raspberry Pi with a few minor upgr...
by W. H. Heydt
Tue Feb 18, 2020 11:58 pm
Forum: General discussion
Topic: Powering Pi Zero with AA batteries
Replies: 25
Views: 644

Re: Powering Pi Zero with AA batteries

Imperf3kt wrote:
Tue Feb 18, 2020 10:58 pm
The Pi plus a voltage regulator will use about 8 watts/h (or more), so after half an hour one can expect to have used 4 watts.
The biggest AA batteries hold around 2.6Ah, which is about 4Wh, I simply forgot to add the hours part.
Make that first part "8 Watts" and then "4 Watt-hours".
by W. H. Heydt
Tue Feb 18, 2020 10:53 pm
Forum: General discussion
Topic: Pi 4 B for $35?
Replies: 8
Views: 413

Re: Pi 4 B for $35?

The $35 price tag for the RPI computer is more of a charity price tag for people interested in programming the retail price tag for the RPI4B will start at $45 for the RPI4B 1GB board only if you purchased the complete starter kit which includes the case for the computer, SD card, power supply, and...
by W. H. Heydt
Tue Feb 18, 2020 8:58 pm
Forum: General discussion
Topic: Play video on a 3.5" LCD
Replies: 6
Views: 128

Re: Play video on a 3.5" LCD

I would probably use mplayer. Bear in mind that the typical resolution for such LCD panels is 480x320. It's also hard to get a very high frame rate. You may not get more than 15 or 20 fps.
by W. H. Heydt
Tue Feb 18, 2020 6:55 pm
Forum: Troubleshooting
Topic: Can't set the proper time zone for Rpi4
Replies: 12
Views: 210

Re: Can't set the proper time zone for Rpi4

Setting America & Vancouver is probably Vancouver, Washington. Setting Canada & Pacific is the more logical setting. However both are essentially the same thing since both Vancouver, Washington and Vancouver, British Columbia are both in the Pacific time zone. Except for one thing that may cause pr...
by W. H. Heydt
Tue Feb 18, 2020 6:09 pm
Forum: Official Foundation Display
Topic: Longevity of official screen
Replies: 3
Views: 164

Re: Longevity of official screen

IIRC the last time this came up, the expected operating life of the RPF screen is 20K hours (which--in theory--would be about 3 years of 24/7 time). In practice, it could vary quite a bit. I've been running one about that long with no sign of failure as my "alarm clock". About two-thirds of the time...
by W. H. Heydt
Tue Feb 18, 2020 5:53 pm
Forum: Beginners
Topic: Consumption raspberry pi zero w
Replies: 9
Views: 196

Re: Consumption raspberry pi zero w

rpdom wrote:
Tue Feb 18, 2020 5:44 pm
ejolson wrote:
Tue Feb 18, 2020 5:29 pm
How many errors are in that chart?
It certain uses some interesting forms of Mathematics. It seems to imply that sqr(I) * R = I * R, so therefore sqr(I) = I :o
In EE, sqrt(-1) is j.

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