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by rpdom
Thu Feb 20, 2020 6:37 pm
Forum: Troubleshooting
Topic: Rpi.GPIO
Replies: 2
Views: 68

Re: Rpi.GPIO

Please describe in detail/diagram/photograph your wiring.
by rpdom
Thu Feb 20, 2020 6:24 pm
Forum: General discussion
Topic: Raspberry Pi model 1 B
Replies: 5
Views: 120

Re: Raspberry Pi model 1 B

I don't think there was an official case for the Pi 1. I didn't see any for sale. I bought various third party cases for mine.
by rpdom
Thu Feb 20, 2020 12:13 pm
Forum: Troubleshooting
Topic: GPIO OUT status
Replies: 3
Views: 75

Re: GPIO OUT status

Or you can put a line in config.txt to set the GPIO in the early stages of the boot.

For example:

Code: Select all

gpio=18=op,dl
Would configure gpio (BCM) 18 to output and drive it low (0V)

Details are here: https://www.raspberrypi.org/documentati ... xt/gpio.md
by rpdom
Thu Feb 20, 2020 6:39 am
Forum: Networking and servers
Topic: Nginx config fails to exclude bots
Replies: 3
Views: 119

Re: Nginx config fails to exclude bots

Wheezy is very old and no longer supported. You should replace it with a new install of Buster.

I could install Wheezy on an old Pi and install nginx and make those changes to see what happens, but I'm going to be very busy today and doubt I'll have the time.
by rpdom
Thu Feb 20, 2020 6:21 am
Forum: HATs and other add-ons
Topic: Raspberry Pi TV Hat DVB-T2 Gateway (Tvheadend with FFmpeg and realtime hardware video stream transcoding)
Replies: 22
Views: 11006

Re: Raspberry Pi TV Hat DVB-T2 Gateway (Tvheadend with FFmpeg and realtime hardware video stream transcoding)

Thanks dgilbert2, will try. But seem to remember that Pi 4 doesn't do Stretch. Well I can stick to the Pi 3 while the repo catches up... You'll still be using Buster, just with the TV-Headend packages for Stretch. It's quite probable that will work. It's the kernel and bootloader parts of the OS th...
by rpdom
Wed Feb 19, 2020 7:36 pm
Forum: General discussion
Topic: Remote power button or reset button?
Replies: 10
Views: 342

Re: Remote power button or reset button?

Unix was about the tenth OS I used - back in 1995. I did also use DOS and Windows, but started switching everything to Linux between 2001 and 2005.
by rpdom
Wed Feb 19, 2020 6:13 pm
Forum: Advanced users
Topic: Overclock to 2.29 Ghz. But How?
Replies: 3
Views: 168

Re: Overclock to 2.29 Ghz. But How?

But does your Pi actually run at the speed that utility is reporting?

Run a CPU stress test on it and see what "vcgencmd measure_clock arm" reports. That will be the actual frequency that the CPUs are running at.
by rpdom
Wed Feb 19, 2020 11:34 am
Forum: Other programming languages
Topic: Introduction to BBC BASIC
Replies: 607
Views: 59093

Re: Introduction to BBC BASIC

I think it may have been due to hardware capabilities. The Envelope function (IIRC) was a feature of the sound chip used on the BBC Micro. I don't believe that's right. My understanding is that ENVELOPE was implemented entirely in software, i.e. in the BBC Micro's MOS, not in the sound chip. If you...
by rpdom
Wed Feb 19, 2020 11:15 am
Forum: C/C++
Topic: Can I write and compile C/C++ code on a PC to run on Pi
Replies: 10
Views: 290

Re: Can I write and compile C/C++ code on a PC to run on Pi

Are you talking about running programs without an OS? If so, that's Bare Metal and there is a section on the forums for it. You still need the bootloader and a few other bits, and your code will load into RAM where it is executed, but you will have direct control of the system. However, in Bare Meta...
by rpdom
Wed Feb 19, 2020 8:12 am
Forum: The MagPi
Topic: Coding book, from beginning to intermediate
Replies: 10
Views: 1414

Re: Coding book, from beginning to intermediate

It takes years to learn just about any language. COBOL took me 10 days (of a 15 day training course). Z80 Assembler took me a while. I used to read "Programming the Z80" every night for ages. 6502 didn't take too long. ARM was fun. So few instructions with so many options. BASIC varied. I learnt ma...
by rpdom
Wed Feb 19, 2020 8:05 am
Forum: General discussion
Topic: How to demonstrate high speed broadband in an imaginative way?
Replies: 2
Views: 141

Re: How to demonstrate high speed broadband in an imaginative way?

That sounds like a great project. I can't think of many ideas at the moment, but perhaps a room full of kids on various hardware doing Code Club projects? To show the improvement you could have a few of the computers running though a Pi with traffic shaping software installed to limit the bandwidth ...
by rpdom
Wed Feb 19, 2020 7:58 am
Forum: Troubleshooting
Topic: I have problem using bcm-2835 in raspberry pi 4 B
Replies: 8
Views: 222

Re: I have problem using bcm-2835 in raspberry pi 4 B

The Pi4 uses a BCM2711, not a BCM2835 Irrelevant. The drivers and libraries are still called bcm2835 across the entire Pi range. Any documentation to show this? Just curious, never seen that fact. Joan has already pointed you at some. Also, the internal designations for the chips are different. BCM...
by rpdom
Wed Feb 19, 2020 7:44 am
Forum: Beginners
Topic: Original 7inch display with touchscreen setting
Replies: 14
Views: 259

Re: Original 7inch display with touchscreen setting

I consider USB devices to be Hot Pluggable or Hot Swappable so with that the screen is cold pluggable only. I agree. Plug and Play used to be, as you said, for things like sound cards where you could power off your PC, put the card in, power it back up, load some drivers (in most cases) and start u...
by rpdom
Wed Feb 19, 2020 7:37 am
Forum: Other programming languages
Topic: Introduction to BBC BASIC
Replies: 607
Views: 59093

Re: Introduction to BBC BASIC

I have no idea why Acorn made this incompatible, and arguably retrograde, change I think it may have been due to hardware capabilities. The Envelope function (IIRC) was a feature of the sound chip used on the BBC Micro. The RISC OS systems didn't have that chip, so they designed their own stuff. I ...
by rpdom
Wed Feb 19, 2020 6:29 am
Forum: General discussion
Topic: Sandisk Ultra Plus or Extreme
Replies: 13
Views: 411

Re: Sandisk Ultra Plus or Extreme

zombiehunterpro wrote:
Wed Feb 19, 2020 12:14 am
I am planning to make a Supercomputer with 4 2gb ram raspberry pi 4’s for a total of 4 cpus and 8gb of ram.
That will give you 16 CPUs as each Pi 4B has 4 CPUs in it.
by rpdom
Tue Feb 18, 2020 6:10 pm
Forum: Troubleshooting
Topic: Dead after 5.5V Input at micro USB
Replies: 17
Views: 442

Re: Dead after 5.5V Input at micro USB

My 3v3 and GND are short. will changing TVS diode fix it? If your 5V reads 5V and your 3.3V reads 0V on a 3B+, the PMIC chip has died and you need to replace the Pi. Can you please share me the link to the PMIC I wanna know where it's available. It isn't available. It is a custom version of the chi...
by rpdom
Tue Feb 18, 2020 5:44 pm
Forum: Beginners
Topic: Consumption raspberry pi zero w
Replies: 9
Views: 198

Re: Consumption raspberry pi zero w

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
by rpdom
Tue Feb 18, 2020 12:46 pm
Forum: Python
Topic: Python 3 (IDLE) on raspbian
Replies: 7
Views: 150

Re: Python 3 (IDLE) on raspbian

sudo apt update && sudo apt install idle3
by rpdom
Tue Feb 18, 2020 11:29 am
Forum: General discussion
Topic: Did RPF change the RAM on Pi Zero?
Replies: 5
Views: 284

Re: Did RPF change the RAM on Pi Zero?

I guess the pricing on RAM has changed a bit. The original Pi 1B used a variety of RAM chips, including Micron, so the BCM2835 firmware is already configured for those.

All of my Pi Zeros seem to have Elpida chips on, but I haven't bought any new ones for a while.
by rpdom
Tue Feb 18, 2020 10:56 am
Forum: Advanced users
Topic: Create an (ISO/BIN) Image
Replies: 6
Views: 154

Re: Create an (ISO/BIN) Image

Perhaps use dd Something like: dd if=/dev/sda of=xxx.img bs=128K That will work. It's what I would use, with a bit of tweaking on size. for a specific size of SD card I hope you are aware that very few SD cards are an exact specific size. Even a set of 16GB cards from the same manufacturer and the ...
by rpdom
Tue Feb 18, 2020 10:43 am
Forum: Automation, sensing and robotics
Topic: Control DVD Player LEDs FROM GPI
Replies: 11
Views: 168

Re: Control DVD Player LEDs FROM GPI

pcmanbob wrote:
Tue Feb 18, 2020 10:30 am
On my monitor they look to be yellow, blue, black, silver. assuming R9,R10,R11 are the ones being used a current limiters for the LEDs
Pretty certain they look yellow, purple, brown, silver on my monitors.
by rpdom
Tue Feb 18, 2020 8:26 am
Forum: Raspbian
Topic: PubkeyAuthorization no, PasswordAuthorization no I changed these, now I am stuck
Replies: 11
Views: 237

Re: PubkeyAuthorization no, PasswordAuthorization no I changed these, now I am stuck

Something is not right there. You should be able to access your files on the SD card with another Linux system. I do it all the time. Are you using root/sudo to access the card? It may haven mounted read-only if errors were detected in the filesystem. Possibly unmounting it and running fsck on it wi...
by rpdom
Tue Feb 18, 2020 7:59 am
Forum: General discussion
Topic: Remote power button or reset button?
Replies: 10
Views: 342

Re: Remote power button or reset button?

emma1997 wrote:
Tue Feb 18, 2020 1:14 am
Then week of so after that Woody gets released and here we go again... (obviously joking because these guys are doing a fantastic job fixing things.)
Certainly joking... next release is Bullseye. Woody was about 18 years ago. I remember it well. It was the second release of Debian I used.
by rpdom
Tue Feb 18, 2020 7:47 am
Forum: Troubleshooting
Topic: I have problem using bcm-2835 in raspberry pi 4 B
Replies: 8
Views: 222

Re: I have problem using bcm-2835 in raspberry pi 4 B

Imperf3kt wrote:
Tue Feb 18, 2020 2:44 am
The Pi4 uses a BCM2711, not a BCM2835
Irrelevant. The drivers and libraries are still called bcm2835 across the entire Pi range.
by rpdom
Tue Feb 18, 2020 7:45 am
Forum: Beginners
Topic: Confused - how to safely shutdown RaspPi 3b+
Replies: 8
Views: 218

Re: Confused - how to safely shutdown RaspPi 3b+

Imperf3kt wrote:
Tue Feb 18, 2020 3:16 am
pin 2 is 5v, do not connect that directly to ground.
What you are referencing is probably the shutdown dt overlay which you add to config. txt and then short pins 5 and 6
GPIO2 is pin 3. Not 5V. I think GuppyHJD is thinking about GPIO3 which IS pin 5.

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