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by mahjongg
Sun Sep 24, 2017 12:53 am
Forum: General discussion
Topic: My Raspberry Pi 3 doesn´t display anything on the screen
Replies: 3
Views: 115

Re: My Raspberry Pi 3 doesn´t display anything on the screen

for boot problems read the boot problem sticky in beginners.
by mahjongg
Sat Sep 23, 2017 1:36 pm
Forum: Beginners
Topic: USB test pins in Pi Zero and Powerboost 1000C
Replies: 6
Views: 110

Re: USB test pins in Pi Zero and Powerboost 1000C

Hi, I've seen numerous tutorials about soldering usb hub or device directly to test pins underneath the Pi Zero. 1. When I solder the usb hub in the test pins the original micro usb will be permanently unusable since the hub is a device already occupying the duplicated connection, right? yes, the P...
by mahjongg
Sat Sep 23, 2017 1:00 am
Forum: General discussion
Topic: connecting two pi zero via GPIO over a longer distance
Replies: 18
Views: 509

Re: connecting two pi zero via GPIO over a longer distance

most 3.3V CMOS level to RS232 level converters chips like the MAX3232 have built in voltage generators which generate the needed voltages for RS232, with just a few capacitors, and they are ubiquitous thus cheap. RS232 will easily bridge 20Meter or more, with no need to use RS485 5V differential sig...
by mahjongg
Fri Sep 22, 2017 5:37 pm
Forum: General discussion
Topic: connecting two pi zero via GPIO over a longer distance
Replies: 18
Views: 509

Re: connecting two pi zero via GPIO over a longer distance

No GPIO interface is capable of driving 20m of cable without signal loss, the best you can hope for is the serial interface, but as it also only uses 3.3V signaling (and not the low impedance -10V and +10V signaling of a real RS232 interface) so it will probably only work at low speed. The only solu...
by mahjongg
Thu Sep 21, 2017 5:39 pm
Forum: RISCOS
Topic: RISCOS I2C Access
Replies: 3
Views: 831

Re: RISCOS I2C Access

added code tags to original post.
by mahjongg
Tue Sep 19, 2017 5:44 pm
Forum: Troubleshooting
Topic: No way: No Video Input... is bricked my Pi 3 ??
Replies: 25
Views: 807

Re: No way: No Video Input... is bricked my Pi 3 ??

I have updated the common pitfall article with some information from the buyers guide, on where you can buy a guaranteed compatible cable either in the US or in Europe. The RCA to DSUB (actually a VGA-OUT) to RCA adapter is such a non standard item that sometimes come with video cards, so that you c...
by mahjongg
Mon Sep 18, 2017 5:52 pm
Forum: Troubleshooting
Topic: No way: No Video Input... is bricked my Pi 3 ??
Replies: 25
Views: 807

Re: No way: No Video Input... is bricked my Pi 3 ??

Or read this, which gives exactly the same information, but isn't buried in a long post. https://www.raspberrypi.org/forums/vie ... 04#p714304
by mahjongg
Sat Sep 16, 2017 11:43 pm
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3145
Views: 503589

Re: STICKY: Introduce yourself!

I believe you must mean the COSMAC ELF?! or am I mistaken?
by mahjongg
Sat Sep 16, 2017 4:59 pm
Forum: General discussion
Topic: The one and only change I would make to the Raspberry Pi
Replies: 38
Views: 1440

Re: The one and only change I would make to the Raspberry Pi

Do you really thing the folks at the Raspberry Pi Foundation are a bunch of morons that don't have two brain cells to rub together between them? none of your points are sound, this is just another hair brained idea... it's 100% pointless The original post was polite and explained his thoughts about...
by mahjongg
Sat Sep 16, 2017 1:48 pm
Forum: General discussion
Topic: The one and only change I would make to the Raspberry Pi
Replies: 38
Views: 1440

Re: The one and only change I would make to the Raspberry Pi

so this is getting out of hand, I don't like to make discussions impossible by locking the thread, but Hippy seemed hell bent on causing a riot here, So I have given him a day off from this forum, so that the rest of us are spared from him stoking up the fire. yeah, Doughy can be a bit impatient wit...
by mahjongg
Sat Sep 16, 2017 1:16 am
Forum: Debian
Topic: Wall display extended window on multi boards
Replies: 2
Views: 74

Re: Wall display extended window on multi boards

Split off from the thread as this is about x86 Debian, and has nothing to do with raspbian.
by mahjongg
Sat Sep 16, 2017 1:05 am
Forum: General discussion
Topic: The one and only change I would make to the Raspberry Pi
Replies: 38
Views: 1440

Re: The one and only change I would make to the Raspberry Pi

The only change I would make... Use female instead of male headers for the GPIO connector. No, seriously. I'm not being sexist here, it's a real practical matter. Male headers: * easy to accidentally short (short the 3v3 line to ground or 5v, and you will quickly have a dead Pi.) - e.g. scope probe...
by mahjongg
Fri Sep 15, 2017 2:20 pm
Forum: Debian
Topic: x86 Install How to get Pixel Back?
Replies: 2
Views: 137

Re: x86 Install How to get Pixel Back?

Moved post to Debian where it belongs as this is NOT Raspbian!!!
by mahjongg
Wed Sep 13, 2017 9:01 am
Forum: Troubleshooting
Topic: picture did not send to telegram
Replies: 7
Views: 332

Re: coding problem

Added code tags for original poster, also deleted his second copy of this subject.
by mahjongg
Wed Sep 13, 2017 12:39 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: UART keeps going AWOL
Replies: 1
Views: 110

Re: UART keeps going AWOL

did you disable console input/output from/to the serial port?
at boot you can log in using the serial port, you need to disable that if you want to use the serial port for yourself (for your own software).
by mahjongg
Wed Sep 13, 2017 12:32 am
Forum: Troubleshooting
Topic: No way: No Video Input... is bricked my Pi 3 ??
Replies: 25
Views: 807

Re: No way: No Video Input... is bricked my Pi 3 ??

do the LED's on the ethernet connector light up (with a valid connection to another ethernet device)? Have you tried whether composite video output works? P.S. never-mind, I see in your video that the PI has booted, otherwise the Ethernet LED's wouldn't have become active. What I don't understand is...
by mahjongg
Tue Sep 12, 2017 9:11 am
Forum: Troubleshooting
Topic: Virus Backdoor
Replies: 4
Views: 244

Re: Virus Backdoor

Attachment deleted... Who wants to post some malicious bash file????
by mahjongg
Tue Sep 12, 2017 12:52 am
Forum: Beginners
Topic: Shorting GPIO pins - harmful?
Replies: 13
Views: 410

Re: Shorting GPIO pins - harmful?

after boot all GPIO's will act as inputs, except GPIO's used for I2C, and the TXD pin of the UART. but yes, deliberately shorting two GPIO's together isn't a good idea, simply use an 1K resistor in between them if you for some reason MUST connect them together
by mahjongg
Tue Sep 12, 2017 12:43 am
Forum: General discussion
Topic: Is it possible to check if there is malware in the firmware?
Replies: 3
Views: 270

Re: Is it possible to check if there is malware in the firmware?

Doesn't matter where your PI comes from, they are all using the same SoC, (system on a chip) and there is no classical "firmware" in those. In fact all software is on the sd-card, which you can simply overwrite with an image you can download here, and check with a checksum for integrity, if you do n...
by mahjongg
Sun Sep 10, 2017 12:11 pm
Forum: Media centres
Topic: Kodi does not start on PI 3
Replies: 6
Views: 459

Re: Kodi does not start on PI 3

Old OS versions created before a newer PI was launched do not boot on said newer PI, but the latest OS will also boot on all older PI's.
by mahjongg
Sun Sep 10, 2017 11:42 am
Forum: Beginners
Topic: MQ135 Air Quality Sensor (Connection to Raspberry Pi 3)
Replies: 3
Views: 131

Re: MQ135 Air Quality Sensor (Connection to Raspberry Pi 3)

the previous post is NOT a solution! It might work with an Arduino, but it will NOT work with a raspberry PI, its also replaceable with a few duping wires, as its just an interface board from one pinheader standard to another, and as such doesn't do anything useful for you (such as adding an ADC). T...
by mahjongg
Sat Sep 09, 2017 12:46 pm
Forum: Off topic discussion
Topic: Solid-state-relay losses
Replies: 9
Views: 588

Re: Solid-state-relay losses

please don't post in the assistive technology forum!
moved to off-topic.
by mahjongg
Fri Sep 08, 2017 11:52 am
Forum: Advanced users
Topic: ARM CoreSight
Replies: 9
Views: 350

Re: ARM CoreSight

I stand corrected about JTAG, it seems that has changed, the rest of my post stands.
by mahjongg
Thu Sep 07, 2017 9:06 pm
Forum: Advanced users
Topic: ARM CoreSight
Replies: 9
Views: 350

Re: ARM CoreSight

I think that coresight is dependant on coresight hardware being implemented into the chip (SoC), and would be surprised if its implemented in the Broadcom chip the RFP is using. even if it were, it's probably impossible to get information on how to enable and use it , even for something as standard ...

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