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by W. H. Heydt
Tue Jun 25, 2019 3:55 am
Forum: General discussion
Topic: Raspberry 4 backward compatibility
Replies: 1
Views: 119

Re: Raspberry 4 backward compatibility

Those questions have come up in the official thread and the answer is, yes the camera (and one presumes the 7" touchscreen) will work with the Pi4B. The relevant parts of the VC are still there and unchanged.
by W. H. Heydt
Tue Jun 25, 2019 1:15 am
Forum: General discussion
Topic: The RPi4 makes no sense to me. Fight me!
Replies: 17
Views: 592

Re: The RPi4 makes no sense to me. Fight me!

What use is 2x4K? How about a couple of these: https://www.packedpixels.com/ (either version) for a portable Pi with lots of screen real estate.
by W. H. Heydt
Tue Jun 25, 2019 1:13 am
Forum: General discussion
Topic: The RPi4 makes no sense to me. Fight me!
Replies: 17
Views: 592

Re: The RPi4 makes no sense to me. Fight me!

Gavinmc42 wrote:
Tue Jun 25, 2019 12:31 am
There is a big market for embedded displays apparently.
I think Eben said they were surprised how many go into those products.
Remember the December when you couldn't get an A+ for love nor money because some "smart display" company cleaned out the entire supply?
by W. H. Heydt
Mon Jun 24, 2019 9:52 pm
Forum: Off topic discussion
Topic: BCM2711 inplications for the A series
Replies: 0
Views: 80

BCM2711 inplications for the A series

(Kind of a back formation for those who aren't following Pi4B developments in detail the '2711" is the SoC used on the Pi4B.) In the announcement blog post, Eben Upton indicated a *possible*, *future* interest in making a Pi4A. This post is NOT a wish list, nor is a plea for him to do so in the imme...
by W. H. Heydt
Mon Jun 24, 2019 9:38 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 279
Views: 12455

Re: Raspberry Pi 4 Thread - general discussion

Another question for the Engineers: I just installed the latest version of Raspberry Pi Desktop ("buster"), and there is a new option in raspi-config for "Raspberry Pi 4 video output" which requires a Raspberry Pi 4. What is this for? (Is this for setting the screen resolutions?) Pretty sure that h...
by W. H. Heydt
Mon Jun 24, 2019 8:35 pm
Forum: General discussion
Topic: I don't understand the point of still using USB 2.0
Replies: 12
Views: 450

Re: I don't understand the point of still using USB 2.0

mahjongg wrote:
Mon Jun 24, 2019 6:17 pm
Most often two USB ports are only used to connect a keyboard and a mouse anyway.
Ah! But if you use the Official RPF keyboard and plug the mouse into the keyboard's hub, you only need 1 USB 2 port, leaving the other for any medium speed device you might want to attach.
by W. H. Heydt
Mon Jun 24, 2019 8:31 pm
Forum: General discussion
Topic: Pricing of Pi models
Replies: 6
Views: 248

Re: Pricing of Pi models

Appreciating power consumption may be a factor but am wondering; the new 1GB Pi 4 is priced almost the same as a 1GB Pi 3+ so what would prompt someone to purchase a Pi 3+ Not almost, but exactly the same. The Pi2B (both versions) also list at $35. Some reasons someone might buy an older version co...
by W. H. Heydt
Mon Jun 24, 2019 7:40 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 279
Views: 12455

Re: Raspberry Pi 4 Thread - general discussion

Ok, from what I've read so far..... It doesn't boot from USB Is there a way to do USB boot at all? This might be a problem for me as I keep my OS storage on a 1TB HDD... It will in the near future. It's been mentioned a number of times in this thread that it will require a patch to the boot EEPROM,...
by W. H. Heydt
Mon Jun 24, 2019 7:36 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 279
Views: 12455

Re: Raspberry Pi 4 Thread - general discussion

Waiting to see how much over clocking head room is. :) I'm just interested don't need to it. Any guesses??? :D https://www.tomshardware.com/reviews/raspberry-pi-4-b-overclocking,6188.html It's odd that they are telling people to use NOOBS to do the system install. I would that anyone who doesn't ju...
by W. H. Heydt
Mon Jun 24, 2019 4:40 pm
Forum: Beginners
Topic: Raspberry Pi Upgrading.
Replies: 6
Views: 461

Re: Raspberry Pi Upgrading.

And the answer is in. You're looking for the 4GB version of the Pi4B. (See today's blog post.) If the Pi4B doesn't have what you're looking for, one possibility is to wait for the Pi5B...which should be along in the next 2 to 5 years. (My crystal ball is pretty hazy.) A comment on the "perfectionist...
by W. H. Heydt
Mon Jun 24, 2019 4:23 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 279
Views: 12455

Re: Raspberry Pi 4 Thread - general discussion

EMMC really isn't a very good option IMO. Less reliable than SD cards over multiple writes and you cannot replace it when it fails, like you can with an SD card. Well...if it's a card slotted in, that last problem goes away. but then one is back with the same issues we see far too often with SD car...
by W. H. Heydt
Mon Jun 24, 2019 4:08 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 279
Views: 12455

Re: Raspberry Pi 4 Thread - general discussion

5) Same as current quantities? Seems likely. I think it was around the time of the Pi3B launch that it was mentioned that "full production" in Wales was 15K boards per day, and 20K per day could be done for limited periods of time. One would surmise, given the popularity of the Pi, that the rates h...
by W. H. Heydt
Mon Jun 24, 2019 4:00 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 279
Views: 12455

Re: Raspberry Pi 4 Thread - general discussion

1. Downstream USB ports are all host-mode only. USB OTG (2.0) has moved to the USB-C port. I've seen several references to this feature. It's interesting and undoubtedly a good idea (I don't need it, but I'm sure others do). It does imply, though, that either the USB master can supply a solid 3A at...
by W. H. Heydt
Mon Jun 24, 2019 3:43 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 279
Views: 12455

Re: Raspberry Pi 4 Thread - general discussion

DISABLE WIFI/Bluetooth - Or Better still is there going to be a version with no WIFI/BT Chip ?? Is there a WIF/BlueTooth Hardware switch ? I know you can disable this with software, but when thats done is the chip OFF ?? Let me get this right. We release a new Pi, with loads of extra features, and ...
by W. H. Heydt
Mon Jun 24, 2019 3:32 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 279
Views: 12455

Re: Raspberry Pi 4 Thread - general discussion

The VPU and a few legacy bus masters can only address the first 1GB of RAM. The VPU caching still works as before. The new bus master controllers/ARM/ethernet/PCIe have a 35-bit address bus. So...in theory (NOT a request), then 2711 could address 32GB RAM? If so, smart move. Real "future proofing".
by W. H. Heydt
Sat Jun 22, 2019 5:16 am
Forum: General discussion
Topic: Battery for Pi Zero with 3G
Replies: 20
Views: 711

Re: Battery for Pi Zero with 3G

Do you happen to have any ideas for the battery? I've seen people plug the pi directly into the 3.7V powerbank, is that possible? If so will that have a problem with a 3g Dongle? The powerbanks put out 5v through, as already noted, a step up regulator. In order to determine if the powerbank will wo...
by W. H. Heydt
Sat Jun 22, 2019 1:46 am
Forum: General discussion
Topic: Battery for Pi Zero with 3G
Replies: 20
Views: 711

Re: Battery for Pi Zero with 3G

Conversion losses depend on the regulator (either included or supplied by you) It could be 30%, or it could be as low as 4% General advise is to allow 20% for conversion losses, meaning your 10000mAh battery with step-up regulator will provide around 8000mAh at 5v You've forgotten that powerbank Ah...
by W. H. Heydt
Fri Jun 21, 2019 6:09 am
Forum: Beginners
Topic: Raspberry Pi Upgrading.
Replies: 6
Views: 461

Re: Raspberry Pi Upgrading.

Welcome to the forums. Hi, i don't own a raspberry pi yet. But i am about to buy one for a project i am working on. (Probably a RPI 3 B+) As a perfectionist i wanted to see how i could improve my raspberry to make it work better. Here's my question: Can i add more ram? Because the memory interface i...
by W. H. Heydt
Thu Jun 20, 2019 5:16 pm
Forum: Off topic discussion
Topic: NASA and Raspberry Pi
Replies: 8
Views: 716

Re: NASA and Raspberry Pi

One might surmise that the Pi was attached to the network without changing the default password. Given the prominence of CalTech and JPL, one would surmise that changing the default userid should also have been required.
by W. H. Heydt
Thu Jun 20, 2019 4:42 am
Forum: Beginners
Topic: Power on / shutdown RPI time or network
Replies: 7
Views: 230

Re: Power on / shutdown RPI time or network

Just another note, given the intended use of the Pi... A Pi is not rated to be a medical device, nor is it rated for any "life safety" application. If it is critical that you continuously monitor blood glucose at night (and, one might presume, set off an alarm if it goes out of a pre-set range), whi...
by W. H. Heydt
Thu Jun 20, 2019 4:36 am
Forum: Beginners
Topic: Powering a raspberry pi 3 b+ with batteries
Replies: 2
Views: 114

Re: Powering a raspberry pi 3 b+ with batteries

Hi, I am relatively new to raspberry and I need my raspberry to run on batteries for a project Im working on. After looking online for solutions I found many different batteries that run on different voltages with a variety of additional boards, if anybody could give me an explanation about the dif...
by W. H. Heydt
Thu Jun 20, 2019 4:31 am
Forum: Beginners
Topic: Turning off composite RCA output
Replies: 5
Views: 642

Re: Turning off composite RCA output

I would also like to get rid of the entry Composite-1 in my setup - see for example output of xrandr: Since this is, basically, a different question that the one dealt with above AND the last previous entry was 3 years ago (that is, at least one major OS release back), you'd be better off to start ...
by W. H. Heydt
Wed Jun 19, 2019 4:38 am
Forum: Beginners
Topic: 4 AA Battery pack for Servo
Replies: 11
Views: 252

Re: 4 AA Battery pack for Servo

Do you have a controller for your servo? The Pi very likely can't provide the power the servo motor needs. (But one can't be sure without a part or model number.) What GPIO pins are you using? How is your breadboard wired? You speak of "a" resistor. Most circuits (other than extremely simple ones) h...
by W. H. Heydt
Wed Jun 19, 2019 3:04 am
Forum: General discussion
Topic: Battery for Pi Zero with 3G
Replies: 20
Views: 711

Re: Battery for Pi Zero with 3G

kyleisnot wrote:
Wed Jun 19, 2019 1:10 am
I am doing it this way because the trap is very fast, designed to break the animal's neck quickly and painlessly.
Not everyone will want to assist you in building a lethal trap. Have you considered using a live trap so that you can avoid killing animals you don't want to kill?
by W. H. Heydt
Wed Jun 19, 2019 12:20 am
Forum: General discussion
Topic: Battery for Pi Zero with 3G
Replies: 20
Views: 711

Re: Battery for Pi Zero with 3G

A Pi0 is going to draw about 100mA (perhaps less, but work with that). It will be at 5v. So the required power (W) is 0.1A * 5v = 0.5W. To run for 120 hrs. (5 days), it will use 0.5W * 120h = 60Wh. Therefore, you need a battery with more than 60Wh available. Since batteries don't generally put out ...

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