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by mahjongg
Sat Oct 21, 2017 1:10 pm
Forum: Beginners
Topic: STICKY: Common Pitfalls for Beginners
Replies: 24
Views: 292767

Re: STICKY: Common Pitfalls for Beginners

24: BACKUPS DON'T RESTORE (INSUFFICIENT SPACE) often a backup made of an SD card won't restore to a new card because cards of the "same size" (say 8GB) seldom are exactly the same size, so may not have enough capacity to accept the backup, this thread discusses some solutions: https://www.raspberry...
by mahjongg
Sat Oct 21, 2017 12:57 pm
Forum: Beginners
Topic: Absolute new to GPIO concept
Replies: 6
Views: 184

Re: Absolute new to GPIO concept

replaced broken pics in OP's post.
by mahjongg
Sat Oct 21, 2017 12:41 pm
Forum: Troubleshooting
Topic: Official RPi Camera board destroyed by the official RPi0 case
Replies: 3
Views: 103

Re: Official RPi Camera board destroyed by the official RPi0 case

I will forward this post to the moderators section of the board, where it is more likely one of the RPF people will see it. P.S. I looked at the pictures but I didn't grasp why a foam pad would damage the camera board. What damage is actually done? Is a component removed from the board, or what? the...
by mahjongg
Fri Oct 20, 2017 11:44 pm
Forum: Beginners
Topic: Boot Raspberry pi via USB
Replies: 9
Views: 10893

Re: Boot Raspberry pi via USB

locking as this info is outdated, and no longer valid
by mahjongg
Fri Oct 20, 2017 12:26 pm
Forum: Troubleshooting
Topic: Pi 3 blinking power led (even no voltage drops)
Replies: 2
Views: 87

Re: Pi 3 blinking power led (even no voltage drops)

It means the 5V power ON THE PI ITSELF drops below 4.65V, probably because you are using a cheap microUSB cable with very small diameter copper wires in it so it has a high resistance, depending on the current consumption more or less voltage drop occurs. Its a common thing, charger cables are often...
by mahjongg
Fri Oct 20, 2017 9:11 am
Forum: Beginners
Topic: GPIO PUSH button = left mouse click
Replies: 1
Views: 110

Re: GPIO PUSH button = left mouse click

Adafruit has written drivers that convert buttons connected to the GPIO to keyboard inputs, maybe that is a start, and perhaps they also have something similar for mouse button clicks.
Another solution would be to connect a real USB mouse, and solder a button over the one in the mouse.
by mahjongg
Fri Oct 20, 2017 9:04 am
Forum: Troubleshooting
Topic: Will not boot after shutdown !!
Replies: 1
Views: 87

Re: Will not boot after shutdown !!

You are probably using a defective, or fake, SD-Card. Try another one. if its a fake card, it might report a much larger storage capacity than it actually has, and it might simply overwrite earlier written stuff like boot code. Also it could be your powersupply, undervoltages can also corrupt your s...
by mahjongg
Thu Oct 19, 2017 12:15 pm
Forum: Graphics programming
Topic: Post deleted...........?
Replies: 2
Views: 238

Re: Post deleted...........?

Your post "Tkinter How to populate names in listbox?" was deleted because it was off-topic, asking a question about the windows platform, at least you claimed you were running this software on Windows. This is a raspberry PI forum, not a windows forum. Perhaps it was a mistake, if so please re-post ...
by mahjongg
Wed Oct 18, 2017 11:41 pm
Forum: Advanced users
Topic: Rotate display 90º? (not official touch screen)
Replies: 2
Views: 137

Re: Rotate display 90º?

thats why I have split of this post, and moved it from the official display section to advanced users.
leaving it there would have confused the official display users.
by mahjongg
Wed Oct 18, 2017 3:36 pm
Forum: Troubleshooting
Topic: Raspbian Pixel - login screen menu bar missing
Replies: 5
Views: 1095

Re: Raspbian Pixel - login screen menu bar missing

Because this is a very old post, and information in it is no longer valid it has been locked, a similar new topic has been split off.
by mahjongg
Wed Oct 18, 2017 3:32 pm
Forum: Troubleshooting
Topic: Raspbian Pixel - login screen menu bar missing
Replies: 2
Views: 95

Re: Raspbian Pixel - login screen menu bar missing

Split off from no longer valid old necro-ed post.
by mahjongg
Wed Oct 18, 2017 3:23 pm
Forum: Android
Topic: android boot problem!!!
Replies: 1
Views: 194

Re: android boot problem!!!

Sorry but Android isn't an officially supported OS! Its not suitable for education. All versions of Android that exists are written by the community, and run poorly, and the google group is the only place where you will get support. Please go to the google group for support https://groups.google.com...
by mahjongg
Wed Oct 18, 2017 12:12 pm
Forum: General discussion
Topic: How i can display thumbnail for video files
Replies: 2
Views: 117

Re: How i can display thumbnail for video files

Maybe you can use RASPI2PNG (https://github.com/AndrewFromMelbourne/raspi2png) to take screenshots of the movies.
by mahjongg
Wed Oct 18, 2017 9:57 am
Forum: Troubleshooting
Topic: STICKY: libmysqlclient18 has no installation candidate
Replies: 25
Views: 5405

Re: STICKY: libmysqlclient18 has no installation candidate

I asked around, and this is what ShiftPlusOne replied: It's nothing to do with Raspbian directly. Debian don't have the package for stretch, so unless something is pulling it in as a dependency, this isn't a problem. The functionality is provided by mariadb instead of mysql. I think people who are t...
by mahjongg
Tue Oct 17, 2017 10:48 pm
Forum: RISCOS
Topic: RPCEmu on RPi
Replies: 2
Views: 237

Re: RPCEmu on RPi

Why are you emulating RiscOS (I assume running on Raspbian?) when the true RiscOS also runs on the RPI?
by mahjongg
Tue Oct 17, 2017 10:41 pm
Forum: Português
Topic: Múltiplas saídas de som 3.5mm
Replies: 1
Views: 138

Re: Múltiplas saídas de som 3.5mm

Não! Você pode atribuir a saída PWM a GPIO, mas há apenas os dois motores PWM, portanto, você não pode criar quatro canais de áudio com esses. Além disso, você sempre deve deixar o nível de áudio em 100% porque a redução do nível de áudio limitará o alcance da amostra, assim o som será pior. A melho...
by mahjongg
Mon Oct 16, 2017 5:45 pm
Forum: Raspbian
Topic: Strange problem (bug?) setting password
Replies: 13
Views: 497

Re: Strange problem (bug?) setting password

Try this, when the system ask for the user name, type in your password, does the password appear as expected?
by mahjongg
Mon Oct 16, 2017 12:18 pm
Forum: Beginners
Topic: Is it possible to connect more than 5V to ground? <-- Warning Nonsense!
Replies: 19
Views: 722

Re: Is it possible to connect more than 5V to ground?

You can't connect any voltage to ground! I assume you mean you want to connect two grounds from different devices together. I thought that you had to connect the voltage to ground otherwise it would be an incomplete circuit (although my circuitry knowledge is bad so I could be wrong)? Connecting an...
by mahjongg
Mon Oct 16, 2017 12:10 pm
Forum: Beginners
Topic: [SOLVED] Pi Zero W - No overvoltage protection?
Replies: 13
Views: 416

Re: [SOLVED] Pi Zero W - No overvoltage protection?

Apart from no USB and no HDMI, their Pis are working just fine, so undervoltage "protection" isn't even necessary until you hit ~3.4v No HDMI is probably only caused by not being able to read data from the monitors EEPROM, so if you override the automatic monitor capabilities detection, and use con...
by mahjongg
Sun Oct 15, 2017 9:59 pm
Forum: Automation, sensing and robotics
Topic: Logic Chips for Pi Power Supply Project
Replies: 13
Views: 554

Re: Logic Chips for Pi Power Supply Project

NO! If you meant 74HC logic you should have said so. IMHO if you are talking about the 7400 family you are talking about just the first TTL family, (so not even about the LS, ALS and especially not the 74HC and HCT families) HC logic is a much later invention as it is just CMOS (CD4000/HEF4000 etc) ...
by mahjongg
Sun Oct 15, 2017 4:22 pm
Forum: Automation, sensing and robotics
Topic: Logic Chips for Pi Power Supply Project
Replies: 13
Views: 554

Re: Logic Chips for Pi Power Supply Project

Hi. For your logic chips I would suggest you look at the 74 series of chips there are many variations and you might find what you need there. https://en.wikipedia.org/wiki/7400_series COMPARATOR chip is a bit to general it depends on what you want to compare. I would suggest you try googling what e...
by mahjongg
Sun Oct 15, 2017 3:33 pm
Forum: Off topic discussion
Topic: Banana Pi - Model: BPI-M2-Berry compared to Raspi : fully compatible ?
Replies: 14
Views: 654

Re: Banana Pi - Model: BPI-M2-Berry compared to Raspi : fully compatible ?

i'm Dutch, where I live its about 4 meter below sea level! :mrgreen:
by mahjongg
Sun Oct 15, 2017 12:26 pm
Forum: Gaming
Topic: Setting up Raspbian compatablitity with N64 cpu
Replies: 4
Views: 234

Re: Setting up Raspbian compatablitity with N64 cpu

True, the only relatively fast connection with the outside world a RPI has is USB, but even USB is a factor 100 or 1000 slower than a CPU bus, Also, as the USB port also must be used for one or two I/O devices (keyboard/mouse), the total bandwidth available for the CPU conection is just one third or...
by mahjongg
Sat Oct 14, 2017 8:47 pm
Forum: Gaming
Topic: Setting up Raspbian compatablitity with N64 cpu
Replies: 4
Views: 234

Re: Setting up Raspbian compatablitity with N64 cpu

First, the RPI does not even have a BIOS, secondly what you propose is simply impossible. A Pi doesn't have dedicated CPU busses to connect another CPU to.
by mahjongg
Sat Oct 14, 2017 8:30 pm
Forum: Beginners
Topic: STICKY: Common Pitfalls for Beginners
Replies: 24
Views: 292767

Re: Common Pitfalls for Beginners

24:SSH DOESN'T WORK

Recent versions of Raspbian no longer have an open SSH port per default, read this blog:
https://www.raspberrypi.org/blog/a-secu ... ian-pixel/

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