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by mahjongg
Tue Jun 18, 2019 9:07 pm
Forum: General discussion
Topic: QR code reader
Replies: 5
Views: 205

Re: QR code reader

Thats not a QR code, QR codes are easily recognizable by the three alignment squares in three corners of the square.
not every two dimensional barcodes are QR (Quick Recognition) codes.

see wikipedia https://en.wikipedia.org/wiki/QR_code
by mahjongg
Tue Jun 18, 2019 10:21 am
Forum: Off topic discussion
Topic: how heavy is raspbian ?
Replies: 30
Views: 1010

Re: how heavy is raspbian ?

no! not as far as I have anything to say about it....Another moderator might.... :mrgreen:
by mahjongg
Tue Jun 18, 2019 10:02 am
Forum: Off topic discussion
Topic: how heavy is raspbian ?
Replies: 30
Views: 1010

Re: how heavy is raspbian ?

Imperf3kt wrote:
Tue Jun 18, 2019 7:41 am
The thread does appear to have been truncated, however.
Not as far as I know, and r3d4 was the originator, and he linked to a post with a bit of a clickbaity title about the weight of electrons in an empty or "filled" kindle.
by mahjongg
Tue Jun 18, 2019 9:28 am
Forum: Automation, sensing and robotics
Topic: Using Accelerometer to create a Wing control
Replies: 4
Views: 142

Re: Using Accelerometer to create a Wing control

Sorry, I cannot undo the OP's edit. locking as this thread is no longer useful, and as such will be deleted soon.
by mahjongg
Tue Jun 18, 2019 9:25 am
Forum: Gaming
Topic: LCL Gameboy
Replies: 1
Views: 78

Re: LCL Gameboy

Should we really help you doing piracy???
by mahjongg
Tue Jun 18, 2019 9:16 am
Forum: Other projects
Topic: PI Based EMS
Replies: 2
Views: 102

Re: PI Based EMS

Designing your own "electrical muscle shocking apparatus" is dangerous, and can damage your health. All such equipment should be tested by a regulatory instance before it can be safely used, its not something you should build yourself. The RPF will not be held responsible for any experimenting with ...
by mahjongg
Mon Jun 17, 2019 5:27 pm
Forum: Off topic discussion
Topic: input activated by chainsaw))
Replies: 7
Views: 590

Re: input activated by chainsaw))

That would work, but if you program the GPIO as an output, and the switch is closed a large current would flow, which destroys your PI, so I would also add a 330 Ohm resistor in series with the GPIO, like this. button_schem.png also again, the voltage the switch is connected to MUST BE 3V3, as show ...
by mahjongg
Mon Jun 17, 2019 4:48 pm
Forum: Deutsch
Topic: Aktuelle Raspi-Modelle sind empfindlicher bei Kurzschlüssen
Replies: 3
Views: 138

Re: Aktuelle Raspi-Modelle sind empfindlicher bei Kurzschlüssen

Ich habe danach gefragt, und ich bin sicher, dass etwas gegen diese Probleme unternommen wurde, nur solange es alte Modelle in der Pipeline gibt, kann ich dieses Argument nicht weit und breit veröffentlichen. Sie können oder wollen mir auch nicht sagen, was das Problem war und was sie als Lösung gew...
by mahjongg
Mon Jun 17, 2019 3:11 pm
Forum: Off topic discussion
Topic: [FIXED] Ego Search / Own Posts failing
Replies: 54
Views: 4889

Re: [FIXED] Ego Search / Own Posts failing

Me too, its especially grievous for moderators, so I keep harassing Jamesh, who hopefully responds by harassing the web team. :mrgreen:

for now it seems to take 24 hours (until the next UK midnight) until the search results appear.
by mahjongg
Mon Jun 17, 2019 9:12 am
Forum: Off topic discussion
Topic: RetroPie in SEGA VMU and Kodi.
Replies: 2
Views: 145

Re: RetroPie in SEGA VMU and Kodi.

You can't "brick" a PI, nothing is stored in a PI, so if you change the SD-card the PI is "unbricked" again.

that is not to say that you cant damage the PI, I have written about the things that damage it in the "pitfalls sticky", but changing the memory split is not one of them.
by mahjongg
Sun Jun 16, 2019 8:58 pm
Forum: Other projects
Topic: Soil sensor (2 nails) ads1115
Replies: 2
Views: 104

Re: Soil sensor (2 nails) ads1115

NO! use the logic power supply of an RPI, which is 3V3, NOT 5V! otherwise you risk pulling the I2C lines to 5V (the board has pullups to the logic power of the board) which might damage the RPI. remember the first rule of the RPI, never allow any voltage more than 4V to reach a GPIO pin!!!! The RPI ...
by mahjongg
Sun Jun 16, 2019 3:35 pm
Forum: Off topic discussion
Topic: how heavy is raspbian ?
Replies: 30
Views: 1010

Re: how heavy is raspbian ?

Can you measure the state of charge of a rechargeable cell by measuring its weight? no, its unmeasurably small. at a zero point then 32 zero's then 91 kilogram per electron, (that is 0.0000000000000000000000000000000000091 Kg) even with a billion electrons it would still weigh nothing at all, just ...
by mahjongg
Sun Jun 16, 2019 12:15 pm
Forum: Other projects
Topic: Mimo UM 740- with Touchscreen with RPI3B and Stretch, but mouse and keyboard dead
Replies: 3
Views: 88

Re: Mimo UM 740- with Touchscreen with RPI3B and Stretch, but mouse and keyboard dead

Geeviz wrote:
Fri Jun 14, 2019 4:50 pm
Thanks, I wasn't really aware of that. My apologies. I hope I may refer to the old topic with a link in my first post above :)
no problem...
by mahjongg
Sun Jun 16, 2019 11:56 am
Forum: Off topic discussion
Topic: how heavy is raspbian ?
Replies: 30
Views: 1010

Re: how heavy is raspbian ?

never knew that electrons have mass (have weight) but apparently they do. Mass of electron is 9.1×10^-31 kg while proton and neutron weighs almost similar ( 1.67×10^-27 kg). so if a flash cell with a "1" weighs more or less than one with a "0" depends on whether a "charged cell" (with more electrons...
by mahjongg
Fri Jun 14, 2019 11:31 pm
Forum: General discussion
Topic: Using Raspberry PI 3 for remote desktop sessions?
Replies: 12
Views: 471

Re: Using Raspberry PI 3 for remote desktop sessions?

No idea what to split off....

trying to run windows desktop on a RPI is a no go.... AFAIK only amateur hacks are available of windows for ARM, that work very badly.
use raspbian for remote desktop sessions, and anything else.
by mahjongg
Fri Jun 14, 2019 4:46 pm
Forum: Off topic discussion
Topic: input activated by chainsaw))
Replies: 7
Views: 590

Re: input activated by chainsaw))

capacitors always short the disturbance to GND, not to 3V3, in fact to 3V3 could damage the 3V3 signals. in 99% of cases, a hardware designer will choose to have the signal as "active low", with a pullup. Simply invert the input in software, if you insist in using active high logic. if a 100nF capac...
by mahjongg
Fri Jun 14, 2019 4:25 pm
Forum: Other projects
Topic: Mimo UM 740- with Touchscreen with RPI3B and Stretch, but mouse and keyboard dead
Replies: 3
Views: 88

Re: Mimo UM 740- with Touchscreen with RPI3B and Stretch, but mouse and keyboard dead

Re-opening "similar" old threads is frowned upon here (and called "necromancing") especially when the topic is marked [solved]. much better to start a new topic for exactly your issue. So split off, and renamed subject line. after six years its unlikely the same people are still here. also the OS ha...
by mahjongg
Thu Jun 13, 2019 11:20 pm
Forum: Troubleshooting
Topic: Emergency mode to lite
Replies: 1
Views: 93

Re: Emergency mode to lite

Could "rubique" please confirm that she is talking about a real RPI, I'm confused why she mentioned Debian x86 in her post (now edited out).

Note that stuff written for a real PI probably won't work if the OP is using Debian x86 instead.
by mahjongg
Tue Jun 11, 2019 10:46 pm
Forum: Off topic discussion
Topic: My own 8-bit RETRO Homecomputer: RhoCoCo
Replies: 136
Views: 26979

Re: My own 8-bit RETRO Homecomputer: RhoCoCo

I have gotten the I2C PCF8574A IO-expander chip, ( the IO expander that drives the SD-card interface ) working (I can now write to, and read from the expanded I/O ports) and I have also solved a nasty resetting problem. when you inserted an SD-card into the SD-card slot the system would reset due to...
by mahjongg
Tue Jun 11, 2019 10:36 pm
Forum: Off topic discussion
Topic: input activated by chainsaw))
Replies: 7
Views: 590

Re: input activated by chainsaw))

If the pullup resistors you are using are weak, i.e. only software enabled +-50K pullups, strengthen them by lowering their resistance to say 2K2. also, place RF noise filter capacitors (100nF) between the GPIO's affected and GND, as close to the GPIO pins and GNDas possible an electric chainsaw has...
by mahjongg
Tue Jun 11, 2019 8:29 pm
Forum: General discussion
Topic: Forgot my password.
Replies: 11
Views: 439

Re: Forgot my password.

If you have NOT formatted your old card, I would image Raspbian on a new card, using Etcher, then you can use an USB cardreader connected to your PI to try to salvage files from your old card.
by mahjongg
Tue Jun 11, 2019 7:14 pm
Forum: General discussion
Topic: Forgot my password.
Replies: 11
Views: 439

Re: Forgot my password.

The least frustrating way to re-gain access to your PI is to simply start again, and use Etcher to image your card with Raspbian. Although technically possible (for a knowledgeable enough person) to recover your old password, IMHO its not worth the effort. In principle if you have unfettered access ...
by mahjongg
Tue Jun 11, 2019 1:57 pm
Forum: General discussion
Topic: Can i use the Raspberry Pi logo
Replies: 8
Views: 331

Re: Can i use the Raspberry Pi logo

enough of this thanklessness, locking.

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