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by kolban
Tue Aug 30, 2016 4:33 am
Forum: C/C++
Topic: send() blocks up to 30s
Replies: 2
Views: 700

Re: send() blocks up to 30s

Its my understanding that the receiver can also ask the sender to stop sending new data ... for example, if you are sending data faster that the receiver can consume it, then trouble will ensue. For TCP connections, the receiver can cause the sender to block transmission. As such, it may not be an i...
by kolban
Wed Aug 03, 2016 5:43 pm
Forum: Troubleshooting
Topic: Starting a program automatically after boot
Replies: 4
Views: 759

Re: Starting a program automatically after boot

Here is a video for an alternate technique using systemd:

https://www.youtube.com/watch?v=eEuViHanjKI
by kolban
Tue Aug 02, 2016 4:48 am
Forum: Networking and servers
Topic: RPI 3 - as wifi access point to multiple devices
Replies: 3
Views: 1076

Re: RPI 3 - as wifi access point to multiple devices

I believe if you remove the line which reads:

wpa=2

from your hostapd.conf file then you are instructing the application (hostapd) to not require a password for connection.
by kolban
Tue Aug 02, 2016 12:52 am
Forum: The MagPi
Topic: How to get a book reviewed in MagPi?
Replies: 3
Views: 2085

Re: How to get a book reviewed in MagPi?

Thanks Dougie, that was the encouragement I needed. I've written the editor a short email in the hopes that the topic might be something of value to the readership. I recently corresponded with some readers who had some detailed questions and in our chats, their comments were uniformly "Good resourc...
by kolban
Mon Aug 01, 2016 9:50 pm
Forum: The MagPi
Topic: How to get a book reviewed in MagPi?
Replies: 3
Views: 2085

How to get a book reviewed in MagPi?

I publish a free book on the Raspberry Pi family. It is available for download here:

https://leanpub.com/pi

I'm wondering if it could be submitted for review within the MagPi magazine? Is there a process for submission?

Neil
by kolban
Mon Aug 01, 2016 5:04 pm
Forum: Other projects
Topic: Kolban's book on the Raspberry Pi - FREE
Replies: 13
Views: 16591

Re: Kolban's book on the Raspberry Pi - FREE

Another month ... another release. The August edition is now up. I'll be taking a break from dedicated Pi activity to start work on a similar book for NextThingCo CHIP computer. I received a couple last week and am starting to break ground on it.
by kolban
Wed Jul 20, 2016 7:22 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: External SD card module
Replies: 16
Views: 9517

Re: External SD card module

Has there been any news/updates on this story since the last posts and now we have new kernels and Raspbian releases?
by kolban
Wed Jul 20, 2016 8:05 am
Forum: General discussion
Topic: remote access to Pi
Replies: 6
Views: 1735

Re: remote access to Pi

What is the topology of your environment? Is the Pi located on the Internet or behind a firewall? From what kind of device do you want to access the video .... eg. Windows, Linux, Mac, Android etc.

To access the Pi file system we have choices such as FTP, Samba, NFS, SFTP and others.
by kolban
Tue Jul 19, 2016 12:47 am
Forum: Troubleshooting
Topic: Wlan0
Replies: 5
Views: 944

Re: Wlan0

For the dongle that did not work, can you plug it in and post back what: lsusb showed as the device information. The output from lsusb will show us what the USB subsystem thought the device would be and is used to load appropriate device drivers. If we know the device identifiers, we will be able to...
by kolban
Mon Jul 18, 2016 7:27 pm
Forum: General discussion
Topic: RPI3 Access Point
Replies: 2
Views: 566

Re: RPI3 Access Point

I wrote up my notes on using hostapd on the Pi 3 in a book form ... see:

https://leanpub.com/pi
by kolban
Sun Jul 17, 2016 3:36 pm
Forum: General discussion
Topic: Raspberry Pi Wiki
Replies: 5
Views: 1242

Re: Raspberry Pi Wiki

I used to be a huge fan of Wikis in the early 2000's but found that there were far too few participants to make them as useful as we had all hoped. We also got into "meta wars" where folks started bickering over content and content became out of date. My view is that today, we have blogs, forums, st...
by kolban
Mon Jul 11, 2016 10:16 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C Write
Replies: 7
Views: 1730

Re: I2C Write

I have found the (relatively cheap) investment in a Logic Analyzer to pay huge amounts of dividends. See for example: http://www.ebay.com/itm/24MHz-8-Channel-USB-Logic-Analyzer-8-CH-Logic-Analyzer-for-Arduino-MCU-/191685084604 Plugging one of these into your environment to sense the signals over clo...
by kolban
Sun Jul 10, 2016 3:16 am
Forum: Beginners
Topic: Connecting Pi Zero to LCD
Replies: 3
Views: 988

Re: Connecting Pi Zero to LCD

Have a google using the phrase "ssd1963 raspberry pi". When I tried that, I found quite a number of good hits that seem to show existing recipes that folks claim to work ... including some recipes on this forum and You Tube videos.
by kolban
Sun Jul 10, 2016 3:13 am
Forum: Beginners
Topic: Power Multiple Pi-s
Replies: 3
Views: 1244

Re: Power Multiple Pi-s

If we look here ... https://www.raspberrypi.org/help/faqs/ We find the current requirements for various PI's. Without peripherals, the Pi3 is about 400mA. So, if you have a power supply unit that can support a load of 800ma, you could power 2 PI3s ... and scale appropriately. Maybe look at various m...
by kolban
Thu Jul 07, 2016 4:08 pm
Forum: The MagPi
Topic: NPN Darlington pair transistor
Replies: 2
Views: 3220

Re: NPN Darlington pair transistor

Howdy, The link to the magazine is ... https://www.raspberrypi.org/magpi-issues/MagPi47.pdf and the article can be found on p44. The transistor used has to be a power transistor and not a signal processing transistor. An excellent example of one of these would be the "TIP120". These can be found on ...
by kolban
Thu Jul 07, 2016 4:39 am
Forum: Beginners
Topic: Using PIR sensors
Replies: 2
Views: 730

Re: Using PIR sensors

Some PIR sensors have sensitivity adjustments on the module board. Which specific module are you using?
by kolban
Tue Jul 05, 2016 10:30 pm
Forum: Beginners
Topic: Which Language for Raspberry Pi
Replies: 5
Views: 1004

Re: Which Language for Raspberry Pi

My personal go to language is JavaScript running under Node.js. However as others have said, your language choices are wide and varied and there is unlikely to be a "one-answer-fits-all". For example, if your project needs real-time behavior, C or C++ is likely a goto. If your project needs pre-exis...
by kolban
Tue Jul 05, 2016 10:24 pm
Forum: Beginners
Topic: Problems with arguments for execl
Replies: 4
Views: 860

Re: Problems with arguments for execl

To spawn a new process, one uses the fork() system call (see: http://linux.die.net/man/2/fork). A high level psuedo code for what you might want to do is: int pid = fork(); if (pid == 0) { exec my new process code; // Load and execute the new program // This will never be reached } // The process id...
by kolban
Tue Jul 05, 2016 10:18 pm
Forum: Official Foundation Display
Topic: C Library for the LCD Display
Replies: 7
Views: 2797

Re: C Library for the LCD Display

Howdy,
I think the story will be LCD screen specific. What kind of LCD are you using? What are the drivers/software that are currently believed or known to drive the display?
by kolban
Tue Jul 05, 2016 10:16 pm
Forum: General discussion
Topic: RPI3B 5v GPIO specs
Replies: 7
Views: 2836

Re: RPI3B 5v GPIO specs

Have a review of this Raspberry Pi StackExchange Q&A:

http://raspberrypi.stackexchange.com/qu ... can-output

See if that answers the questions.
by kolban
Fri Jul 01, 2016 7:50 pm
Forum: Other projects
Topic: Kolban's book on the Raspberry Pi - FREE
Replies: 13
Views: 16591

Re: Kolban's book on the Raspberry Pi - FREE

Howdy folks, The July 2016 release has now been uploaded and is available for access. Lots of new content and amendments to existing content. Work continues and there will be lots more to come. An especially big thank you to all who have supported the work through a donation through purchase. Your p...
by kolban
Fri Jul 01, 2016 3:03 am
Forum: Troubleshooting
Topic: Logging in with SSH
Replies: 12
Views: 1787

Re: Logging in with SSH

Can you login at the PI with the exact same userid and password? If your pi boots up in a GUI, run "sudo login" at an xterminal shell prompt and try there.
by kolban
Wed Jun 22, 2016 6:12 pm
Forum: General discussion
Topic: Win32DiskImager
Replies: 9
Views: 8287

Re: Win32DiskImager

Ive become a big fan of Etcher ... see:

http://www.etcher.io/
by kolban
Sun Jun 19, 2016 11:06 pm
Forum: Français
Topic: raspberry pi 3 mifare rfid
Replies: 4
Views: 1097

Re: raspberry pi 3 mifare rfid

Might have a look at this free book:

https://leanpub.com/pi

And search on "RFID MFRC522".

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