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by rpdom
Sat Jul 13, 2019 8:39 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 B stopped & died suddenly [due to AC adaptor]
Replies: 8
Views: 387

Re: Raspberry Pi 4 B stopped & died suddenly

Unfortunately I don't have another USB-C AC adapter/power supply - especially not one that could work with Pi4B. I also don't have a micro USB to USB-C adapter. I could buy, but they are a bit expensive in my town. ebay? I picked up a micro USB to USB-C adaptor for about the equivalent of 20 Kronor
by rpdom
Sat Jul 13, 2019 7:45 am
Forum: Troubleshooting
Topic: Help with Temp Sensor Killing Pi's?
Replies: 7
Views: 162

Re: Help with Temp Sensor Killing Pi's?

Can you post a picture of how you wired the sensor to the Pi? Ideally a photograph, so we can check the pin connections. A DS18B20 shouldn't cause the Pi to die. I've been using them for a few years, as have many others. The overheating chip sounds like a GPIO got shorted out somehow. Also, the reco...
by rpdom
Sat Jul 13, 2019 7:22 am
Forum: Troubleshooting
Topic: Raspberry pi 4 - Not working Raspbian OS
Replies: 6
Views: 221

Re: Raspberry pi 4 - Not working Raspbian OS

Red LED on suggests it is not a problem with the power supply. Which HDMI connector did you use? I believe the preferred primary port is the one nearest to the power connector. You can check that the initial boot loader is working by powering up the Pi without the SD card. The green LED should blink...
by rpdom
Sat Jul 13, 2019 4:06 am
Forum: General discussion
Topic: Pi 4 heat sinks
Replies: 21
Views: 1294

Re: Pi 4 heat sinks

The USB socket casings get hot because they are thermally coupled to the SoC via the PCB's ground plane in order to help dissipate heat from the CPUs. The network, power and video connectors are also used in this way.
by rpdom
Fri Jul 12, 2019 7:25 pm
Forum: Graphics, sound and multimedia
Topic: MPEG-TS parallel output over GPIO pins
Replies: 2
Views: 105

Re: MPEG-TS parallel output over GPIO pins

SPI is Serial Peripheral Interface. No use for what you are trying to do.

You can configure the GPIOs to DPI (Display Parallel Interface) mode which may work for you. It is used by the VGA666 interface kit to provide a VGA output via GPIOs. 24 data pins, various sync and other pins.
by rpdom
Fri Jul 12, 2019 6:19 pm
Forum: Troubleshooting
Topic: 2B won't boot to a terminal after last update
Replies: 10
Views: 211

Re: 2B won't boot to a terminal after last update

cDave wrote:
Thu Jul 11, 2019 6:15 pm
Loaded up a virtual Debian box on Windows, and mounted the SD card.

3.3 GB free out of 15.2GB on the ext4 partition.
3.4 MB free out of 59 MB on the fat partition.

The /boot folder is empty
3.4MB is pretty low. That may well be your problem.

The FAT partition is /boot.
by rpdom
Fri Jul 12, 2019 3:04 pm
Forum: Off topic discussion
Topic: OS Features, responce.
Replies: 42
Views: 1113

Re: OS Features, responce.

RISC OS on the other hand acutally offers a lot of features, without third party or extension libraries/modules. So none of those features you list are provided by Relocatable Modules these days? Either in (virtual) ROM or RAM. My RISC OS knowledge is a bit old. I do remember from my first Archimed...
by rpdom
Fri Jul 12, 2019 12:13 pm
Forum: Automation, sensing and robotics
Topic: Thermocouple vs Temperature Sensors
Replies: 4
Views: 198

Re: Thermocouple vs Temperature Sensors

omegaman477 wrote:
Fri Jul 12, 2019 11:57 am
Digital sensors are easy to interface, i2C sensors just need power and 1 wire, and the RPI will read them natively.
Sensors that use the Dallas 1-wire bus just need power and 1 wire for data.

i2c sensors need power and 2 wires, one for data and one for clock.
by rpdom
Fri Jul 12, 2019 11:18 am
Forum: General discussion
Topic: PI4B and Raspbian challenge - Use as main computer a fortnight.
Replies: 31
Views: 1328

Re: PI4B and Raspbian challenge - Use as main computer a fortnight.

I use Kicad on a Pi 3B+ to design PCBs. Found a few issues with it, but mostly works well. I then send the Gerbers to jlcpcb. I'm fairly sure that the eeprom will have options to set the boot order, similar to that in a PC BIOS. It would seem daft not to, especially as it can be reset - maybe a simp...
by rpdom
Fri Jul 12, 2019 6:07 am
Forum: Official Foundation Display
Topic: No output coming from Raspberry Pi
Replies: 5
Views: 210

Re: No output coming from Raspberry Pi

agavepi wrote:
Fri Jul 12, 2019 2:42 am
what happens if you disconnect the jumper wires and power your Pi and your Screen via USB?
- nothing shows up.
What LEDs are showing on the Pi when you power it up and what do they do?

Specifically the red PWR LED and the green ACT LED.
by rpdom
Thu Jul 11, 2019 9:27 pm
Forum: General programming discussion
Topic: GUI Editor Code Challenge
Replies: 174
Views: 2953

Re: GUI Editor Code Challenge

ScriptBasic wrote:
Thu Jul 11, 2019 9:22 pm
Maybe they will create a BASIC board as well?
:lol: :lol: :lol: :lol: :lol: :lol:
by rpdom
Thu Jul 11, 2019 9:18 pm
Forum: Beginners
Topic: Project plan: cistern level monitor and control
Replies: 16
Views: 370

Re: Project plan: cistern level monitor and control

neilgl wrote:
Thu Jul 11, 2019 9:06 pm
Assuming belt and suspender is like belt and braces, a cheap solution I use is to solder the connections, then put hot melt glue inside some heat shrink and then shrink it with a heat gun.
You can get heat shrink already lined with hot melt glue.
by rpdom
Thu Jul 11, 2019 8:54 pm
Forum: Off topic discussion
Topic: Old fashioned fault finding....
Replies: 20
Views: 559

Re: Old fashioned fault finding....

I know old computers used a lot of power, but that's a LOT They certainly did. One I worked on had a couple of ammeters on the wall which used to read around 100A at 208VAC when the computer was running. That was before we added another room full of disk cabinets. There were a set of motor-generato...
by rpdom
Thu Jul 11, 2019 7:12 am
Forum: General discussion
Topic: Charger compatibility with the Pi 4 (Single Type C CC resistor on Pi4)
Replies: 28
Views: 3045

Re: Charger compatibility with the Pi 4 (Single Type C CC resistor on Pi4)

Almost as bad as putting an EEPROM on a Pi. Or a Mondeo engine in a Volvo. Have you done that then? I knew someone who put a 2 litre twin cam Fiat engine in a Reliant Kitten. Not many Reliants could wheel spin from standstill in third gear and hit 125 mph in fifth :-) That technique used to be call...
by rpdom
Thu Jul 11, 2019 6:40 am
Forum: General discussion
Topic: forgot the password.
Replies: 11
Views: 352

Re: forgot the password.

Firstly, adding init=/bin/sh to cmdline.txt makes the Pi boot with a very restricted environment. It is automatically logged in as the "root" super user. Also, the main file system is set to read-only mode, which means you can't change any files. The command mount -o remount,rw /dev/mmcblk0p2 / tell...
by rpdom
Thu Jul 11, 2019 6:30 am
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3495
Views: 81003

Re: STICKY: Introduce yourself!

Just 1 BIG question. When will we see a fully functional version of Raspian 'Buster'? This version is nice to get a look at the unit but fails in the apt-update/upgrade ends. Also, what might be the high end for the SOC's temperature. I have seen some highs and quickly found a fan to keep it cool. ...
by rpdom
Thu Jul 11, 2019 6:15 am
Forum: General discussion
Topic: Will number of RPi 4s sold exceed previous generations?
Replies: 7
Views: 286

Re: Will number of RPi 4s sold exceed previous generations?

DavidS wrote:
Thu Jul 11, 2019 6:03 am
It would be nice if either RPiF or RPIT would break down the sales by model when they make there big sales anouncements.
Someone on here, I can't remember who, has created graphs of the sales timeline of the various models based on information that has been released.
by rpdom
Thu Jul 11, 2019 6:11 am
Forum: Beginners
Topic: "apt-get update testing to stable" [FIXED]
Replies: 18
Views: 7385

Re: "apt-get update testing to stable" [FIXED]

BUSTER whether NOOBS or .img the steps I distilled and then tried and I am presuming they worked. .img: unpack 2019-06-20-raspbian-buster-full.zip to get 2019-06-20-raspbian-buster-full.img use balenaETCHER (formerly ETCHER) to flash this img file to a suitable SSD (240gb? in my case) or HD (2Tb in...
by rpdom
Wed Jul 10, 2019 7:21 pm
Forum: Beginners
Topic: [SOLVED] Can I connect an arduino directly to GPIO using a 10k ohm resistor?
Replies: 9
Views: 204

Re: Can I connect an arduino directly to GPIO using a 10k ohm resistor?

drgeoff wrote:
Wed Jul 10, 2019 7:16 pm
rpdom wrote:
Wed Jul 10, 2019 6:38 pm
You need a voltage divider. Just a 3k3 to the 5V input and a 2k2 resistor to ground should do.
It is more usual to have the 2:3 ratio with the '2' to the Arduino output (not the 5 volt rail) and the '3' to ground.
Yes, you are correct. I have corrected my post. Thank you.
by rpdom
Wed Jul 10, 2019 6:53 pm
Forum: General discussion
Topic: PI4B and Raspbian challenge - Use as main computer a fortnight.
Replies: 31
Views: 1328

Re: PI4B and Raspbian challenge - Use as main computer a fortnight.

Musketeer wrote:
Wed Jul 10, 2019 6:50 pm
There is a way - connect 10k Zeros and make them to supa-PC + use virtual x86/64 CPU! :idea:

Basic, Watson!
So how would you do that? What software would you use? How would you interconnect them?

Silly idea.
by rpdom
Wed Jul 10, 2019 6:45 pm
Forum: General discussion
Topic: Charger compatibility with the Pi 4 (Single Type C CC resistor on Pi4)
Replies: 28
Views: 3045

Re: Charger compatibility with the Pi 4 (Single Type C CC resistor on Pi4)

Burngate wrote:
Wed Jul 10, 2019 5:45 pm
Almost as bad as putting an EEPROM on a Pi.

Or a Mondeo engine in a Volvo.
Have you done that then?

I knew someone who put a 2 litre twin cam Fiat engine in a Reliant Kitten. Not many Reliants could wheel spin from standstill in third gear and hit 125 mph in fifth :-)
by rpdom
Wed Jul 10, 2019 6:39 pm
Forum: Advanced users
Topic: RPI4 Continuously corrupting SD cards
Replies: 4
Views: 417

Re: RPI4 Continuously corrupting SD cards

The first question is the usual one: What power supply are you using?
by rpdom
Wed Jul 10, 2019 6:38 pm
Forum: Beginners
Topic: [SOLVED] Can I connect an arduino directly to GPIO using a 10k ohm resistor?
Replies: 9
Views: 204

Re: Can I connect an arduino directly to GPIO using a 10k ohm resistor?

You need a voltage divider. Just a 2k2 to the 5V input and a 3k3 resistor to ground should do.
[edit] Corrected order of resistors.
by rpdom
Wed Jul 10, 2019 2:03 pm
Forum: General discussion
Topic: PI4B and Raspbian challenge - Use as main computer a fortnight.
Replies: 31
Views: 1328

Re: PI4B and Raspbian challenge - Use as main computer a fortnight.

Musketeer wrote:
Wed Jul 10, 2019 1:31 pm
Sure! If someone REALLY loves Pis, he changes his occupation even! :idea:
Sounds good to me. :)
by rpdom
Wed Jul 10, 2019 1:59 pm
Forum: Raspbian
Topic: Where can I check a rasbian package changelog?
Replies: 2
Views: 102

Re: Where can I check a rasbian package changelog?

Or look at /usr/share/doc/$PACKAGENAME/changelog.gz

Hopefully RPT update that file on Raspbian as well or produce their own version.

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