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by drgeoff
Tue Dec 18, 2018 3:44 pm
Forum: Advanced users
Topic: HDMI output and overscanning
Replies: 5
Views: 195

Re: HDMI output and overscanning

I've never had a problem with a Raspberry Pi and an LCD monitor , but the overscan issue is to do with TV screens and the historical fact that TV signals had to allow for the time it took for the old CRT screens to get back to the start of the next line. That is not factually correct. Overscan had ...
by drgeoff
Tue Dec 18, 2018 10:05 am
Forum: General discussion
Topic: camera ip on the PI3
Replies: 2
Views: 70

Re: camera ip on the PI3

Is there a good reason why you don't change the IP address of the camera to be on the 192.168.1 subnet?
by drgeoff
Sun Dec 16, 2018 4:53 pm
Forum: General discussion
Topic: Wifi 5GHz not working
Replies: 24
Views: 501

Re: Wifi 5G

n67 wrote:
Sun Dec 16, 2018 3:59 pm
hello everyone i have problem i can not connect 5G wifi to raspberry pi knows someone how this is coming
I don't see any references to 2.4Ghz or 5Ghz in the above text. Maybe I need glasses...
@n67
See the third post in this thread. Which was almost 5 hours before your suggestion of mobile.
by drgeoff
Sun Dec 16, 2018 3:50 pm
Forum: Beginners
Topic: making piezoelectric fogger
Replies: 2
Views: 64

Re: making piezoelectric fogger

Yes, but the RPI is not well used, you could replace it with two transistors, two capacitors, and four resistors (an astable multivibrator). Hardly worth using an RPI for. And even then you would need extra hardware to boost the 3V3 output level to something large enough to get the piezo disk to vi...
by drgeoff
Sun Dec 16, 2018 3:38 pm
Forum: General discussion
Topic: Wifi 5GHz not working
Replies: 24
Views: 501

Re: Wifi 5G

There are (at least) two possible interpretations of what OP means by "Wifi 5G". I assumed he meant the upcoming new standard (we have 3G, and 4G. 5G is just around the corner!) Everyone else seems to have assumed he meant 5Ghz. It seems pretty obvious to me. The clue is "WiFi". The other "5G" is m...
by drgeoff
Sat Dec 15, 2018 4:56 pm
Forum: Troubleshooting
Topic: PI 3 B+ not working with the official power supply
Replies: 3
Views: 111

Re: PI 3 B+ not working with the official power supply

Hello. I recently bought a PI 3 B+ and the official power supply to use only for emulation. Believe it or not but I was never able to get the PI to work, instead I always get a blank screen with the lightning bolt. I have another power supply at home with 5v and 3a but the results are the same... l...
by drgeoff
Sat Dec 15, 2018 4:48 pm
Forum: Beginners
Topic: D sub power saving mode
Replies: 5
Views: 116

Re: D sub power saving mode

To run a VGA display from a RPi you need some active electronics (which require power) between the two. There exist passive cables with a HDMI plug at one end, a 15 pin D connector at the other end and only wires between the two. Those will only work with devices which abuse the HDMi spec and put VG...
by drgeoff
Fri Dec 14, 2018 10:48 pm
Forum: Troubleshooting
Topic: Raspberry PI Model 2 B won't boot
Replies: 8
Views: 167

Re: Raspberry PI Model 2 B won't boot

Welcome to the forums. What size SD card are you using? What file system type did you apply when you reformatted the card? the SD card is 128GB and i used SDFormatter to format it Well, that's the problem. Cards of 64 Gbyte and larger get formatted as exFAT. RaspberryPis cannot boot from a card whe...
by drgeoff
Fri Dec 14, 2018 7:12 pm
Forum: HATs and other add-ons
Topic: TV Hat / Cable TV
Replies: 6
Views: 341

Re: TV Hat / Cable TV

I have neither a TV hat nor a cable TV feed so I cannot do a test to see if the former will work with the latter. However DVB-T and DVB-C are very similar. The vast majority of TVs sold in Europe (including the UK and Ireland) are based on hardware chassis that support both. Regionalisation is done ...
by drgeoff
Fri Dec 14, 2018 6:50 pm
Forum: Automation, sensing and robotics
Topic: Alarm System using existing DSC wiring
Replies: 8
Views: 229

Re: Alarm System using existing DSC wiring

Judging by the words "using existing DSC wiring" in the title he chose the OP has come to the conclusion, probably correctly, that the existing wiring is the most useful part of the current installation. Installing the wring tends to be the most time consuming part of a wired alarm system which is w...
by drgeoff
Fri Dec 14, 2018 4:57 pm
Forum: Troubleshooting
Topic: RP3 B+ is booted up and not working
Replies: 1
Views: 53

Re: RP3 B+ is booted up and not working

Did you do a software shutdown and wait for the 10 flashes of the green LED before removing power or did you just remove power? The latter can corrupt files on the card and cause non-booting.

Try reloading the OS on to the card.
by drgeoff
Fri Dec 14, 2018 4:52 pm
Forum: Troubleshooting
Topic: Kali linux delayed block allocation
Replies: 1
Views: 39

Re: Kali linux delayed block allocation

Suggest you use Kali's own support channels. https://www.kali.org/community/.
by drgeoff
Fri Dec 14, 2018 4:50 pm
Forum: Troubleshooting
Topic: Raspberry PI Model 2 B won't boot
Replies: 8
Views: 167

Re: Raspberry PI Model 2 B won't boot

Try using Etcher to put Raspbian image, not NOOBS, on the card.
by drgeoff
Fri Dec 14, 2018 4:43 pm
Forum: Beginners
Topic: Wearable real time feedback motion correction project
Replies: 2
Views: 49

Re: Wearable real time feedback motion correction project

Either use or copy a vibrator of the mobile phone type. They are merely an electric motor turning a weight around an axis which is displaced from the centre of gravity of the weight.
by drgeoff
Thu Dec 13, 2018 10:44 pm
Forum: Troubleshooting
Topic: HDMI Audio Output to Monitor w/ Speakers
Replies: 3
Views: 79

Re: HDMI Audio Output to Monitor w/ Speakers

I know it sounds daft but does your HDMI cable carry sound ...? That is a daft question that shows a lack of understanding of HDMI. HDMI multiplexes audio, video and auxiliary data together and sends them over the same wires in the cable. Thus it is impossible to have a HDMI cable which carries vid...
by drgeoff
Wed Dec 12, 2018 9:20 am
Forum: Troubleshooting
Topic: false push buttons press when connecting to long wires
Replies: 12
Views: 264

Re: false push buttons press when connecting to long wires

Try putting a 100nF capacitor from GPIO to ground and using twisted pair of wires to each switch. Maybe just an error in your diagram but your yellow wire is on the wrong end of the 1k resistor. Also your configuration is a bit unusual. Most people would have the switched 3.3v going to 10k resistor ...
by drgeoff
Tue Dec 11, 2018 11:59 am
Forum: Beginners
Topic: Raspberry for the Industry
Replies: 17
Views: 501

Re: Raspberry for the Industry

wow, so you are saying that when it comes to critical applications the Arduino is more reliable than the Pi No. The message you should take onboard is that the software running on an Arduino (a microcontroller) is much simpler and more deterministic. Raspbian on a RPi is a full blooded, multi-user,...
by drgeoff
Tue Dec 11, 2018 11:41 am
Forum: General discussion
Topic: Whither _Raspberry Pro_?
Replies: 6
Views: 270

Re: Whither _Raspberry Pro_?

How do you expect anyone to make a recommendation when your requirements above a RaspberryPi are unknown?
by drgeoff
Mon Dec 10, 2018 10:32 pm
Forum: General discussion
Topic: Can i just swap sd cards to have multiple os??
Replies: 5
Views: 142

Re: Can i just swap sd cards to have multiple os??

Issue a software shutdown command and wait for it to complete. Remove power. Then and only then remove a card. Insert another card. Apply power.
by drgeoff
Mon Dec 10, 2018 6:19 pm
Forum: Beginners
Topic: how to increase the raspberry pi 3 wifi range
Replies: 9
Views: 5417

Re: how to increase the raspberry pi 3 wifi range

Increasing the RPi transmitter power, even if possible and legal, only improves the communication from the RPi. It does nothing in the other direction.
by drgeoff
Mon Dec 10, 2018 12:39 pm
Forum: General discussion
Topic: battery
Replies: 10
Views: 323

Re: battery

Will5455 wrote:
Mon Dec 10, 2018 12:31 pm
I am going to use it for a dfrobot devastater and run it for quite a while probably
If you will "run it for quite a while probably" you will probably need quite a large battery.
by drgeoff
Sun Dec 09, 2018 9:56 pm
Forum: General discussion
Topic: battery
Replies: 10
Views: 323

Re: battery

And the run-time you need.
by drgeoff
Sun Dec 09, 2018 3:40 pm
Forum: General discussion
Topic: My RPi model B+ won't turn on, is there any way to revive it?
Replies: 19
Views: 512

Re: My RPi model B+ won't turn on, is there any way to revive it?

One guy on reddit suggested me to try to maybe locate the store where the device was bought by unique ID on it, if there is any? I know other devices have unique ID with them, but I couldn't find such info for rpi on google. Yes they all have a serial number but AFAIK it is not printed on any label...

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