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by drgeoff
Sun Nov 12, 2017 4:52 pm
Forum: Troubleshooting
Topic: Pi won't connect to assigned IP Address
Replies: 7
Views: 234

Re: Pi won't connect to assigned IP Address

kopp123 wrote:
Sun Nov 12, 2017 4:30 pm
Hmm could I could have done that when I set up a new wireless printer?
Very unlikely. If your printer is Wi-Fi connected to your router, the printer will not be running a DHCP server.
by drgeoff
Thu Nov 09, 2017 1:06 pm
Forum: Beginners
Topic: 1080p video playback, no audio through hdmi
Replies: 3
Views: 190

Re: 1080p video playback, no audio through hdmi

fruitoftheloom wrote:
Thu Nov 09, 2017 6:58 am
HDMi does carry sound if you have a quality HDMi Cable
HDMI multiplexes the audio with the video and they go over the same wires in the cable. If the OP is getting video OK, then a different cable will not rectify his lack of audio.
by drgeoff
Wed Nov 08, 2017 9:30 am
Forum: Troubleshooting
Topic: Audio over VNC
Replies: 3
Views: 168

Re: Audio over VNC

VNC uses a relatively simple compression method which works quite well on static windows containing text or simple graphics. The compression algorithm performs very poorly on moving natural images. Bandwidth and processing restraints in the end to end system curtail the received quality.
by drgeoff
Tue Nov 07, 2017 9:27 pm
Forum: Beginners
Topic: Detect hot shoe trigger from analogue camera
Replies: 10
Views: 328

Re: Detect hot shoe trigger from analogue camera

https://en.wikipedia.org/wiki/Hot_shoe

It seems to be nothing more than a normally open switch which is momentarily closed when the shutter is opened. The internet has many tutorials on attaching switches to RPi GPIOs.
by drgeoff
Mon Nov 06, 2017 11:30 pm
Forum: Troubleshooting
Topic: Never-ending SD Card Partitioning at Start-up with NOOBS
Replies: 10
Views: 279

Re: Never-ending SD Card Partitioning at Start-up with NOOBS

The Volume Name still being Canakit after formatting also points the finger at the card.
by drgeoff
Sun Nov 05, 2017 9:10 am
Forum: Troubleshooting
Topic: Pi Zero W will not connect to wifi router
Replies: 4
Views: 174

Re: Pi Zero W will not connect to wifi router

Can you access your router's configuration page? It should be at 192.168.1.1, with a defualt password you can google based on the manufacturer. Although many routers default to be on 192.168.1.1 not all do. Other very common addresses are 192.168.0.1 and 192.168.1.254. Also it is becoming much more...
by drgeoff
Sat Nov 04, 2017 3:54 pm
Forum: Beginners
Topic: connecting my RPi to an access point
Replies: 4
Views: 132

Re: connecting my RPi to an access point

Yes it looks like you have a faulty port. Have a close look at the socket for missing or bent contacts.
by drgeoff
Sat Nov 04, 2017 12:50 pm
Forum: Troubleshooting
Topic: How to use pull up resistor (on board) using wiringPI
Replies: 4
Views: 175

Re: How to use pull up resistor (on board) using wiringPI

I looked on the WiringPi site for all the different commands but found nothing. Took me less than 1 minute to Google and find http://wiringpi.com/the-gpio-utility/ That page has the section "Standard input and output commands" which says: "gpio mode <pin> in/out/pwm/clock/up/down/tri This sets the ...
by drgeoff
Sat Nov 04, 2017 12:37 pm
Forum: Beginners
Topic: GPIO Interrupts when I move my hands near the cable
Replies: 13
Views: 428

Re: GPIO Interrupts when I move my hands near the cable

Software debouncing will not bring any improvement. The cable is picking up stray AC mains fields via the human body. Similar to the hum produced when touching a sensitive microphone input. The cure is to lower the impedance of the GPIO input (by a pull up or pull down resistor or a capacitor) or to...
by drgeoff
Fri Nov 03, 2017 9:02 pm
Forum: Media centres
Topic: LibreElec on Berryboot pulling video from a Wi-Fi NAS
Replies: 6
Views: 550

Re: LibreElec on Berryboot pulling video from a Wi-Fi NAS

If the disk is USB connected to the router and the RPi is within inches of the router I'm left wondering why you are concerned about Wi-Fi performance. Are there very good reasons why you won't either plug the disk into a USB port on the RPi or keep the disk plugged into the router and use an ethern...
by drgeoff
Fri Nov 03, 2017 11:53 am
Forum: Advanced users
Topic: Who to contact about ordering boards with codecs unlocked?
Replies: 15
Views: 611

Re: Who to contact about ordering boards with codecs unlocked?

Since it is entirely a software thing, there is no such thing as unlocking the HW itself, so buying boards with them already enabled would require buying the boards with an SD card already programmed. That does not seem to agree with what jamesh's colleague dom said in https://www.raspberrypi.org/f...
by drgeoff
Fri Nov 03, 2017 9:30 am
Forum: Advanced users
Topic: How do i disable micro-usb ports
Replies: 7
Views: 387

Re: How do i disable micro-usb ports

All the 5 volt points* on a Zero or ZeroW are directly connected together by the PCB tracks. There is no way that software alone can break the path between any of them.

(* The two micro-USB sockets, the relevant holes in the GPIO header area, the dc-dc converters etc)
by drgeoff
Thu Nov 02, 2017 10:05 pm
Forum: Advanced users
Topic: Who to contact about ordering boards with codecs unlocked?
Replies: 15
Views: 611

Re: Who to contact about ordering boards with codecs unlocked?

We must be very close to the expiry time of the last patent in the MPEG-2 pool that is still in force. More than 90% of them were gone by 2015.
by drgeoff
Thu Nov 02, 2017 9:54 pm
Forum: Troubleshooting
Topic: RPi 3 B boot from USB HD failed
Replies: 24
Views: 723

Re: RPi 3 B boot from USB HD failed

In days of old, you couldn't boot a system if were above 8gb, then it became, I think, 20gb, nowadays Linux boot loaders can, but I wonder if the Raspberry code can. Perhaps try re arranging the partitions to have Rasbian first might work. That was a LILO "feature". GRUB has superseded LILO. But ne...
by drgeoff
Thu Nov 02, 2017 5:13 pm
Forum: Off topic discussion
Topic: Reality Check
Replies: 23
Views: 1421

Re: Reality Check

A more appropriate comparison in terms of performance and what hardware you get for the money might be those US$40-ish media player boxes/sticks running Android. But they don't have the flexibility of RPis.
by drgeoff
Wed Nov 01, 2017 11:19 pm
Forum: Media centres
Topic: LibreElec on Berryboot pulling video from a Wi-Fi NAS
Replies: 6
Views: 550

Re: LibreElec on Berryboot pulling video from a Wi-Fi NAS

I was just looking for a bit of help and was wondering if it is possible to use the Raspberry PI 3 with kodi OSMC or LibreElec (preferred) setup on the Berryboot Bootloader and play videos from a NAS, which would be a 5TB Seagate attached directly to a gigabit wifi router via USB. 1. Yes it is poss...
by drgeoff
Wed Nov 01, 2017 9:22 pm
Forum: Troubleshooting
Topic: Need help with power issue.
Replies: 10
Views: 425

Re: Need help with power issue.

musei wrote:
Wed Nov 01, 2017 9:19 pm
Can the Raspberry Pi 3 be Powered over Ethernet with the onboard port?
The onboard ethernet port does not support PoE.
by drgeoff
Wed Nov 01, 2017 1:03 pm
Forum: Networking and servers
Topic: Whatever happened to Ethernet over USB?
Replies: 3
Views: 294

Re: Whatever happened to Ethernet over USB?

Nothing happened to it. 1. Raspbian is and has always been based on Debian. The versions of Raspbian have the same names as the Debian versions namely Wheezy, Jessie and Stretch for the most recent three in chronological order. The details you have found for Zero and ZeroW models of RPis should stil...
by drgeoff
Wed Nov 01, 2017 11:22 am
Forum: Beginners
Topic: Can I wire OR multiple GPIO?
Replies: 17
Views: 536

Re: Can I wire OR multiple GPIO?

May be I am reading this wrong but I read the original post as 4 outputs from pi to a single input on breadboard circuit. aim is that any output going high activates circuit. so why not just add a diode between each output and the bread board input that way current can flow out of the gpio to the i...
by drgeoff
Wed Nov 01, 2017 11:20 am
Forum: Beginners
Topic: Can I wire OR multiple GPIO?
Replies: 17
Views: 536

Re: Can I wire OR multiple GPIO?

If you really want to use a chip, 4-input NAND gates are common.

A OR B OR C OR D is the same as NOT(NOT A AND NOT B AND NOT C AND NOT D)

The NAND gate already does the final inversion. Just need to invert the logic of the outputs providing the A, B, C and D into the NAND gate chip.
by drgeoff
Wed Nov 01, 2017 8:26 am
Forum: Beginners
Topic: Can I wire OR multiple GPIO?
Replies: 17
Views: 536

Re: Can I wire OR multiple GPIO?

The OP asked about ORing 4 GPIO input pins. Yes you can connect 4 input pins together* with no danger to the RPi provided those pins are never allowed to be push-pull outputs in opposite states. Of course whatever is outputting to those pins is a different kettle of fish, typically not advisable for...
by drgeoff
Tue Oct 31, 2017 11:13 am
Forum: Troubleshooting
Topic: Problems with latest Bluetooth code
Replies: 11
Views: 354

Re: Problems with latest Bluetooth code

Maybe not totally unconnected with what jamesh posted at viewtopic.php?f=28&t=196529&p=1228787#p1228787
by drgeoff
Tue Oct 31, 2017 11:06 am
Forum: Beginners
Topic: Raspberry pi & Breadboard setup
Replies: 4
Views: 245

Re: Raspberry pi & Breadboard setup

When two elements are in series the current through them is the same. Add the voltages across each one to get the total voltage across both. When two elements are in parallel the voltage across them is the same. Add the currents through each one to get the total current through both. No matter how m...
by drgeoff
Tue Oct 31, 2017 8:25 am
Forum: Beginners
Topic: Voltage and Amperage Specs for GPIO Pins
Replies: 15
Views: 431

Re: Voltage and Amperage Specs for GPIO Pins

HawaiianPi wrote:
Mon Oct 30, 2017 10:45 pm
with a limit of 16mA per GPIO pin (which is the limit of the board traces).
The 16 mA limit is due to the GPIO output stage in the Broadcom chip. Nothing to do with board traces.
by drgeoff
Mon Oct 30, 2017 10:42 pm
Forum: Networking and servers
Topic: RPi as backup wifi router
Replies: 10
Views: 2306

Re: RPi as backup wifi router

The proper way to do this is a special router* that has both the wired internet and wireless internet access methods on its WAN side. The client devices on the LAN are completely unaware of the switch from wired to wireless and back. (* eg http://www.draytek.co.uk/information/our-technology/failover)

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