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by rpdom
Sun Jul 07, 2019 4:03 pm
Forum: Camera board
Topic: Using Smartphone cameras as PiCameras
Replies: 3
Views: 202

Re: Using Smartphone cameras as PiCameras

Almost certainly no, not possible.
by rpdom
Sun Jul 07, 2019 3:17 pm
Forum: Off topic discussion
Topic: The Great Raspberry Pi Computers.
Replies: 105
Views: 3360

Re: The Great Raspberry Pi Computers.

alphanumeric wrote:
Sun Jul 07, 2019 2:59 pm
From what I read on the link I posted above, the eprom isn't read over i2c. Its accessed via BCM 0 and BCM 1.
Hey, guess what BCM0 and BCM1 are used for by default?

I2C0 SDA and I2C0 SCL
by rpdom
Sun Jul 07, 2019 2:55 pm
Forum: Networking and servers
Topic: A way to redirect http traffic to https
Replies: 10
Views: 839

Re: A way to redirect http traffic to https

nigelbartlett1 wrote:
Sun Jul 07, 2019 9:08 am
I followed up rpdom's idea to use a reverse proxy and this worked.
Cool. More often a reverse proxy is used for the opposite reason: https access to a legacy http server, but it can work both ways. :)
by rpdom
Sun Jul 07, 2019 2:49 pm
Forum: Off topic discussion
Topic: The Great Raspberry Pi Computers.
Replies: 105
Views: 3360

Re: The Great Raspberry Pi Computers.

Well, I haven't got a Sense Hat to hand at the moment. I can get hold of one in a couple of days, but I suspect it is using the HAT base i2c address for identification purposes and other addresses for its own functionality.
by rpdom
Sun Jul 07, 2019 2:42 pm
Forum: Advanced users
Topic: Booting off SSD - very slow to detect
Replies: 4
Views: 249

Re: Booting off SSD - very slow to detect

There will always be a bit of a delay when booting a Pi 3 from USB as it checks for a bootable SD card first.
by rpdom
Sun Jul 07, 2019 2:29 pm
Forum: Off topic discussion
Topic: The Great Raspberry Pi Computers.
Replies: 105
Views: 3360

Re: The Great Raspberry Pi Computers.

Yes, you can have multiple i2c addresses, but the HAT system is designed to use one. Also, what happens if you stack HATs and two or more of them try to claim the same GPIO pins? One or more of them will fail. FWIW I use GPIOs, Audio, one USB port and ethernet on my Pi collection. I used to use comp...
by rpdom
Sun Jul 07, 2019 11:50 am
Forum: Off topic discussion
Topic: The Great Raspberry Pi Computers.
Replies: 105
Views: 3360

Re: The Great Raspberry Pi Computers.

There are many many "Hats" out there that aren't really Hats. Mainly because they don't have an ID eprom. I'm fine with that because as far as I know, you can't stack two Hats if they both have an eprom. At least you couldn't in the past. I have several Pi's with stacked Hats on them. The Hats that...
by rpdom
Sun Jul 07, 2019 8:14 am
Forum: Off topic discussion
Topic: The Great Raspberry Pi Computers.
Replies: 105
Views: 3360

Re: The Great Raspberry Pi Computers.

I find Wifi to be unreliable in general (not the Pi specifically). I use wired Ethernet wherever I can. When WiFi can handle reliable true 1Gb rates then I might consider using it.
by rpdom
Sun Jul 07, 2019 8:02 am
Forum: Beginners
Topic: [SOLVED] RCA output not working on Raspberry pi 3b+
Replies: 10
Views: 240

Re: RCA output not working on Raspberry pi 3b+

I don't have any meter to test which ring is ground. You don't need meter. An LED, a resistor, a power supply and a handful of dupont wires will work for continuity testing. RPi pin#1 (+VE) and pin#6 (GND/-VE) gives you a power supply (at 3.3V). You can buy a cheap new multimeter on ebay for about ...
by rpdom
Sun Jul 07, 2019 6:54 am
Forum: Beginners
Topic: cooling for RPi4
Replies: 9
Views: 698

Re: cooling for RPi4

HawaiianPi wrote:
Sun Jul 07, 2019 3:09 am
There is nothing official for cooling.
Other than the PoE HAT.

But if you're not using Power over Ethernet there is no point in getting that HAT.
by rpdom
Sat Jul 06, 2019 5:19 pm
Forum: General discussion
Topic: NTFS USB stick inconsistency between Raspbian and Windows
Replies: 58
Views: 1427

Re: NTFS USB stick inconsistency between Raspbian and Windows

It seems to be a "standard" for partitions of 64GB and over to be formatted as exFAT by default. Even though FAT32 is capable of handling the capacity. Perhaps it is something to do with maximum file size, which IIRC is 4GB on FAT 32.
by rpdom
Sat Jul 06, 2019 11:46 am
Forum: General discussion
Topic: Question: is there a "searchlist" mechanism in raspbian?
Replies: 9
Views: 229

Re: Question: is there a "searchlist" mechanism in raspbian?

jbudd wrote:
Sat Jul 06, 2019 11:39 am
Well they are both startlingly fast on a Pi 4 with newly installed Buster. Edit - and 8GB Sandisk class 1 SD
You don't have a lot of files in your file system, do you? ;-)

When you have a Pi with around 300,000 files on 2TB of external storage it takes a bit longer.
by rpdom
Sat Jul 06, 2019 11:29 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 259
Views: 46358

Re: Raspberry Pi 4 temperature

joural wrote:
Sat Jul 06, 2019 11:15 am
Is this firmware update installed permanently on board or when i change SD card do i have to execute it again? Thank you
Yes, this firmware is installed on the board, unlike previous Pi models.
by rpdom
Sat Jul 06, 2019 11:25 am
Forum: General discussion
Topic: Question: is there a "searchlist" mechanism in raspbian?
Replies: 9
Views: 229

Re: Question: is there a "searchlist" mechanism in raspbian?

Find is much slower than locate though and if you run it as a non-root user you get masses of permissions messages unless you throw them away with find / -name myfile.ext 2>/dev/null locate has to build it's indexes though and that used to slow some of my old Linux systems to a crawl while that was...
by rpdom
Sat Jul 06, 2019 11:22 am
Forum: Troubleshooting
Topic: Pi 4, 4GB RAM, not booting, CMA: failed to reserve 256 MiB mib.
Replies: 6
Views: 338

Re: Pi 4, 4GB RAM, not booting, CMA: failed to reserve 256 MiB mib.

No point in putting GPU memory over 256MB. The new VC6 uses CMA to split memory between CPUS and GPU as required.

Even 256MB is possibly excessive.
by rpdom
Sat Jul 06, 2019 8:06 am
Forum: General discussion
Topic: USB Type C of Pi 4 model B
Replies: 25
Views: 1407

Re: USB Type C of Pi 4 model B

The USB-C port on the Pi4 is in a USB 2.0 client configuration hence many of the connections aren't used. All of the type C connectors should be incompatible as long as the connector you are using has the pins you need for your application (for example the pi uses one without the superspeed pins as...
by rpdom
Sat Jul 06, 2019 7:58 am
Forum: General discussion
Topic: PiHut and ModMyPi
Replies: 2
Views: 221

Re: PiHut and ModMyPi

Yes, I got one of those emails too.

I thought the E11 address given was familiar. I used to live a shortish walk from there.
by rpdom
Sat Jul 06, 2019 7:42 am
Forum: Troubleshooting
Topic: GPIO4 on a 3B not working.
Replies: 1
Views: 64

Re: GPIO4 on a 3B not working.

You can change the GPIO that is used by the 1-wire bus, so if just GPIO 4 is dead you can use another.

However once a GPIO is damaged it can cause stresses in other parts of the chip and end up with a dead Pi.
by rpdom
Sat Jul 06, 2019 7:36 am
Forum: General discussion
Topic: Heatsinks official for rpi 4 ?
Replies: 43
Views: 3084

Re: Heatsinks official for rpi 4 ?

Ok, just for fun I decided to run a test on my Pi 4B. I got an old PC CPU heatsink. Removed the fan and cut off a 10mmx10mm piece from it. I cleaned that up, put some cheap heatsink compound on it, and stuck it on top of the SoC (small blob of superglue on each corner to hold it in place). I then ra...
by rpdom
Sat Jul 06, 2019 7:01 am
Forum: Off topic discussion
Topic: The Great Raspberry Pi Computers.
Replies: 105
Views: 3360

Re: The Great Raspberry Pi Computers.

PCB design software is the last on my list of must have software. I'm using Kicad to design PCBs. It seems to work mostly OK. I've had a few glitches. Currently I'm running Kicad 5.1.2 on Raspbian Buster (upgraded from Stretch, as a Buster image wasn't available when I installed it) on a Pi 3B+. I'...
by rpdom
Sat Jul 06, 2019 6:54 am
Forum: Device Tree
Topic: Pi-4 Activating additional UART ports
Replies: 16
Views: 515

Re: Pi-4 Activating additional UART ports

An updated ARM Peripherals document is going to be released soon that will cover the additional UARTs and I2C buses on the Pi 4B.

I think it has been mentioned somewhere about the GPIOs that they are available on and which ALT modes need to be selected.
by rpdom
Sat Jul 06, 2019 6:44 am
Forum: General discussion
Topic: Slow upload on new Raspberry Pi 4 2GB
Replies: 3
Views: 239

Re: Slow upload on new Raspberry Pi 4 2GB

I ran speedtest-cli on my Pi 4B 4GB. It is connected to my router via three Gigabit switches (I have quite a network at home). The router is then connected to my cable modem. I have an alleged 100Mb/s Download, 6Mb/s Upload service. The results were... actually, I'll just run it again now to get a f...
by rpdom
Fri Jul 05, 2019 8:24 pm
Forum: General discussion
Topic: Should I wait for the next revision of the pi 4
Replies: 40
Views: 2047

Re: Should I wait for the next revision of the pi 4

Who says you couldn't stack the BCM2837 on top of the RAM? Rather than the conventional arrangement on the Mk1 Raspberries. So all the pins from the SoC would have to be passed through the RAM chip to get to the PCB? RPi Zero doesn't use all the pins. It uses enough. All the first bank of GPIOs, th...
by rpdom
Fri Jul 05, 2019 8:19 pm
Forum: General discussion
Topic: Should I wait for the next revision of the pi 4
Replies: 40
Views: 2047

Re: Should I wait for the next revision of the pi 4

DougieLawson wrote:
Fri Jul 05, 2019 8:16 pm
Who says you couldn't stack the BCM2837 on top of the RAM? Rather than the conventional arrangement on the Mk1 Raspberries.
So all the pins from the SoC would have to be passed through the RAM chip to get to the PCB?
by rpdom
Fri Jul 05, 2019 8:08 pm
Forum: Beginners
Topic: Cloud Storage
Replies: 2
Views: 106

Re: Cloud Storage

NextCloud is basically an improved version of OwnCloud.

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