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by rpdom
Fri Apr 19, 2019 4:35 pm
Forum: General discussion
Topic: Creating new user (problem)
Replies: 3
Views: 42

Re: Creating new user (problem)

I have a lot to learn. Yes, but don't worry, you will get the basics fairly quickly :) On thing is that you did "sudo su" which switches you to the "root" user. Then you did "sudo adduser john". The sudo there is unnecessary as sudo means "run this command as if it was entered by the "root" user - ...
by rpdom
Fri Apr 19, 2019 4:30 pm
Forum: Advanced users
Topic: PI 3b power to USB and peripherals. Dependent on PI or power supply?
Replies: 5
Views: 93

Re: PI 3b power to USB and peripherals. Dependent on PI or power supply?

Which pins on the GPIO are + and - 5 Volts? Also, I have a ham radio hot spot board plugged into this GPIO. Is there something that I can put between the PI and the ham radio board to allow me to connect the power supply to the PI? +5 Volts is on Pins 2 and 4 of the GPIO connector. There is no "-5 ...
by rpdom
Fri Apr 19, 2019 4:06 pm
Forum: General discussion
Topic: No Wifi RasbPi 3 A+
Replies: 6
Views: 66

Re: No Wifi RasbPi A+

I realize this will look like nitpicking, but one really needs to describe any given Pi correctly. As already noted, the Pi Model A+ (aka A+ or Pi1A+) does not have on-board WiFi. The Pi 3 Model A+ (aka Pi3A+) does. There is also the point that, in your wpa_supplicant file, you give the country as ...
by rpdom
Fri Apr 19, 2019 7:15 am
Forum: Media centres
Topic: Using P1 to input DVB-T parallel transport stream
Replies: 6
Views: 2669

Re: Using P1 to input DVB-T parallel transport stream

That's a good idea. Here in 2019 I am researching about ts stream and GPIO... Have you heard of the official Pi DVB-T tuner uHAT? It won't work with a Pi 1, but should work with any other the other models. It uses SPI to transfer the data. The drivers provide a standard interface so you can use it ...
by rpdom
Fri Apr 19, 2019 5:42 am
Forum: Off topic discussion
Topic: Why Avoid BASIC on RPi?
Replies: 1771
Views: 69562

Re: Why Avoid BASIC on RPi?

The Ryzen 7 is an 8-core x86-compatible AMD desktop processor listed around US $200 running in a new but inexpensive office computer. Single-core performance seems not much better than your older i7, though I suspect even a newer i5 would run faster than either. i5 8265U (laptop): $ time ./bcfibo |...
by rpdom
Thu Apr 18, 2019 6:46 am
Forum: General discussion
Topic: Max Power Supply For Raspberry Pi 3 b +
Replies: 25
Views: 427

Re: Max Power Supply For Raspberry Pi 3 b +

Hi, Ok so, I can Provide 5V and 2.5 A max to Raspberry Pi, right?And I wanted to Know about How Much current I can Draw from 5V and 3.3V? And Can we Ask for a Custom designed Raspberry Pi? From the 5V I would say you can draw up to 1.2A. From the 3.3V I would say a maximum of 50 to 100mA. Yes, you ...
by rpdom
Thu Apr 18, 2019 6:39 am
Forum: Beginners
Topic: SCREEN
Replies: 13
Views: 252

Re: SCREEN

How does your software know the size of the monitor? Now it is usually pretty easy (these days) to detect the monitor geometry (vertical and horizontal pixel counts), but size? xrandr will report back the monitor geometry, relative position and horizontal and vertical size in mm. From that it would...
by rpdom
Thu Apr 18, 2019 6:31 am
Forum: General discussion
Topic: Max Power Supply For Raspberry Pi 3 b +
Replies: 25
Views: 427

Re: Max Power Supply For Raspberry Pi 3 b +

Unfortunately I don't know. I think the micro USB socket delivering power to the Pi is rated for 2.5A. I suspect 0.5A could be drawn from the 5V pins, but am not sure. Anyone else have a better answer? The fuse on the Pi 3B+ is rated at about 2.5A, so that is the maximum current that the Pi can tak...
by rpdom
Thu Apr 18, 2019 6:03 am
Forum: Beginners
Topic: How to calculate resistors...
Replies: 42
Views: 597

Re: How to calculate resistors...

Based on the links provided by Andyroo - 3.3v-3.0 =0.3V with 20mA LED - would be 15Ohm and 3.3v-3.2v = 0.1v with 20mA LED - would be 5.6Ohm resistor. But like I said even 1kOhm is looking good to me with these and based on these calculations - I have no idea how to actually calculate what my real a...
by rpdom
Thu Apr 18, 2019 5:54 am
Forum: General discussion
Topic: Please I need help i am a noob, how would i connect raspberry pi 3 b+ to my chromebook.
Replies: 25
Views: 493

Re: Please I need help i am a noob, how would i connect raspberry pi 3 b+ to my chromebook.

I checked to make sure the ssh file is in the boot part of SD card and it wasn't so I added it but still does not work. When I check again to see if ssh is in boot it's not so I added again and still saying same thing. That is normal behaviour. You only need to put the file there once to enable the...
by rpdom
Wed Apr 17, 2019 2:54 pm
Forum: Beginners
Topic: Can't Remove SETTINGS File from Desktop
Replies: 26
Views: 429

Re: Can't Remove SETTINGS File from Desktop

I think you can disable showing it on the desktop from the main menu: Preferences->Appearance Settings->Desktop and untick External Disks. This will prevent any USB storage devices showing up as well.
by rpdom
Tue Apr 16, 2019 2:09 pm
Forum: Beginners
Topic: Can't Remove SETTINGS File from Desktop
Replies: 26
Views: 429

Re: Can't Remove SETTINGS File from Desktop

I think that this is a partition on your SD card (NOOBS perhaps?) that is being mounted at /media/pi/SETTINGS and you have the option to show mounted devices on the desktop set.

What does df -h show in the terminal?
by rpdom
Tue Apr 16, 2019 9:11 am
Forum: Beginners
Topic: Stop Raspberry Pi from running program at boot
Replies: 1
Views: 66

Re: Stop Raspberry Pi from running program at boot

The file you edited was /etc/rc.local. The files you can see in your Windows are the contents of /boot on the Raspbian system. They are the files needed to start the Pi and launch the initial Linux Kernel. There is a second partition on the card which Windows does not recognise, where all the Linux ...
by rpdom
Tue Apr 16, 2019 4:50 am
Forum: Troubleshooting
Topic: Controlling LED on GPIO3
Replies: 7
Views: 136

Re: Controlling LED on GPIO3

I specifically chose the blue LED because I know it can take 3.3v Yes, and the table shows that is at 20mA current. GPIO pins can supply a maximum of 16mA, but that is not guaranteed to be at 3.3V, it is only certain that it will be at a voltage that will be considered a "logic high" which is about...
by rpdom
Mon Apr 15, 2019 5:08 pm
Forum: Beginners
Topic: Using Sensor and Pi outside
Replies: 14
Views: 257

Re: Using Sensor and Pi outside

But going around shouting out that the pins are 5V tolerant when they are not is irresponsible. People will see that and think it ok to add devices that have pull-ups to 5V and destroy their Pis.

That's my last word on this matter.
by rpdom
Mon Apr 15, 2019 4:47 pm
Forum: Beginners
Topic: Using Sensor and Pi outside
Replies: 14
Views: 257

Re: Using Sensor and Pi outside

Yes. Open Collector which means those lines will never see 5V. They will see 0V when pulled low by the open collector circuit, or 3.3V when pulled high via the resistors on the Pi. That is good because they are not 5V safe. Saying they are 5V safe is entirely untrue.
by rpdom
Mon Apr 15, 2019 4:04 pm
Forum: Beginners
Topic: Using Sensor and Pi outside
Replies: 14
Views: 257

Re: Using Sensor and Pi outside

I still don't get where Dougie gets this idea that the I2C pins on the Pi can handle 5V. They can't. Like all the other pins they work on 0V or 3.3V. They have pull-ups to 3.3V. Bung 5V on one and even the pull to 3.3V won't stop the pin voltage going over 4V and eventually frying the GPIO.
by rpdom
Mon Apr 15, 2019 4:01 pm
Forum: Advanced users
Topic: SSH daily file creation...How do I do it?
Replies: 12
Views: 314

Re: SSH daily file creation...How do I do it?

Answer: I installed the full set of software because there is plenty of room on the SD card. The extra software does not seem to slow down the DNS requests at all. The unused extra software will not cause you any performance issues other then sometimes when running a software update. If, for exampl...
by rpdom
Mon Apr 15, 2019 1:13 pm
Forum: Advanced users
Topic: is it possible to turn gpio pins in to i2c pins???
Replies: 9
Views: 1532

Re: is it possible to turn gpio pins in to i2c pins???

Was this really worth reviving a four-year-old dead topic for?
by rpdom
Mon Apr 15, 2019 11:58 am
Forum: Troubleshooting
Topic: Static IP Address for USB Screencast in Raspbian Stretch
Replies: 4
Views: 116

Re: Static IP Address for USB Screencast in Raspbian Stretch

ifconfig reflects what's in /etc/network/interfaces, which amounts, as you noted, to about nothing in Raspbian Stretch ifconfig on its own shows all active network interfaces. ifconfig -a shows all available network interfaces. It has nothing to do with the /etc/network/interfaces file which was us...
by rpdom
Mon Apr 15, 2019 10:46 am
Forum: Advanced users
Topic: How to get QGIS3.x?
Replies: 10
Views: 400

Re: How to get QGIS3.x?

- Add the following line: " deb http://ftp.debian.org/debian sid main " (alternative mirrors can be found [herel][https://packages.debian.org/sid/armhf/qgis/download]). That's not a good idea. Debian Sid is the "Unstable" branch. That's the one where the latest fixes and versions are put. It freque...
by rpdom
Mon Apr 15, 2019 5:12 am
Forum: General discussion
Topic: Connecting a tactile switch
Replies: 28
Views: 854

Re: Connecting a tactile switch

That isn't like the pull up. It's more like a pull-down, but still not right.

Try this:
IMG_3567a.JPG
IMG_3567a.JPG (38.61 KiB) Viewed 78 times
by rpdom
Sun Apr 14, 2019 7:56 pm
Forum: Beginners
Topic: How to connect a old keyboard to a PI?
Replies: 13
Views: 280

Re: How to connect a old keyboard to a PI?

There is no such thing as a DIN 3.5 DIN plugs/sockets are named for the number of pins (and sometimes a letter to indicate the arrangement of the pins, or "mini" to indicate a smaller version of the DIN system. By "3.5" I think you mean a 3.5mm jack plug. They also come in other sizes such as 2.5mm ...
by rpdom
Sun Apr 14, 2019 5:17 pm
Forum: Other programming languages
Topic: Introduction to BBC BASIC
Replies: 76
Views: 1044

Re: Introduction to BBC BASIC

This would be my BASIC of choice, if I still programmed in BASIC. I note that you live in the UK, and are of an age to have used BBC BASIC at its peak of popularity, so that's not surprising. In parts of the world where the BBC Micro had little impact (particularly the US, where it bombed - too exp...

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