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by ejolson
Tue Nov 08, 2016 12:55 am
Forum: General discussion
Topic: First Dead RPi.
Replies: 6
Views: 1170

Re: First Dead RPi.

DavidS wrote:Nothing on the GPIO of the 3B at the time, Heatsink always on SoC for the 3B, with good high conductivity thermal paste.
That is odd. I guess we'll know in a year or so whether there was a run of Pi 3's that stop working. I like the idea of getting a new Pi 2 v1.2 with the 64-bit SOC as well.
by ejolson
Tue Nov 08, 2016 12:41 am
Forum: General discussion
Topic: First Dead RPi.
Replies: 6
Views: 1170

Re: First Dead RPi.

DavidS wrote:Today I had a Raspberry Pi die for the first time ever.
Sorry to hear of the mishap. Was there anything connected to GPIO when it died? Did you have a heatsink on the SOC?
by ejolson
Sun Nov 06, 2016 11:01 pm
Forum: C/C++
Topic: The MagPi does C :-)
Replies: 124
Views: 26838

Re: The MagPi does C :-)

gordon@drogon.net wrote:lifes still somewhat interesting here and my bakery which was intended as therapy has somewhat taken off... It just goes to show that if you make something that people want, they'll want more!
Congratulations on the success of the bakery. Do you use a Pi in any of the day to day operations?
by ejolson
Sun Nov 06, 2016 9:24 pm
Forum: Beginners
Topic: The worst beginner experience... Help
Replies: 14
Views: 2651

Re: The worst beginner experience... Help

*update* I bougth a new SD card, copied the same archives on it and it boot NOOBS, but in the moment I want to click on Rasbian button installation, the screen jus turn off and the now I hav loope three memories with the same behavior. Maybe it's your monitor or cable. I've had computers that refus...
by ejolson
Sun Nov 06, 2016 6:45 am
Forum: Staffroom, classroom and projects
Topic: Laptops and Pi's?
Replies: 15
Views: 5797

Re: Laptops and Pi's?

rpdom wrote:Also, what is wrong with using wired internet on laptops?
Your points are well taken. Note that many newer laptops, especially the smaller ones, don't include a wired interface.
by ejolson
Sun Nov 06, 2016 6:27 am
Forum: Advanced users
Topic: Operating system on raid 0 usb flash drives
Replies: 9
Views: 3574

Re: Operating system on raid 0 usb flash drives

I am unsure how to switch over to a raid 0 in cmdline.txt as on boot, as mdadm would not be on the kernel to recognize the usb sticks as raid. As mentioned, root on RAID is usually done by loading an initramdisk first that sets up the array and then pivots root. The initramdisk should be placed in ...
by ejolson
Sat Nov 05, 2016 8:55 pm
Forum: Advanced users
Topic: Fun with underclocking
Replies: 10
Views: 11052

Re: Fun with underclocking

They said underclocking was a non starter for power saving. Or you could look at Rattus' link There is a confusion here between power (measured in watts) versus energy (measured in watt-hours). Your argument, if true, would imply that the total energy needed to perform a particular task is independ...
by ejolson
Sat Nov 05, 2016 8:06 pm
Forum: Staffroom, classroom and projects
Topic: Laptops and Pi's?
Replies: 15
Views: 5797

Re: Laptops and Pi's?

If your monitors already support multiple inputs, you could pick up a set of the bargain basement KVM switches and use them solely for USB switching capabilities if don't want kids pulling out cables. Laptops are great if the students purchase them and are responsible for lugging them about; less g...
by ejolson
Sat Nov 05, 2016 4:07 am
Forum: Staffroom, classroom and projects
Topic: My Raspberry Pi class
Replies: 48
Views: 19977

Re: My Raspberry Pi class

I know for a fact that I could not gut an RC car, stick a Pi in it, and have it work! A Pi car made out of an RC toy is easier than you think. In my case I didn't need to take out any of the existing electronics. The logic levels used by the RC chip were exactly the same as the GPIO, so all that wa...
by ejolson
Sat Nov 05, 2016 12:06 am
Forum: C/C++
Topic: The MagPi does C :-)
Replies: 124
Views: 26838

Re: The MagPi does C :-)

My advice to any C programmer would be always to compile with "gcc -Wall". Many of the people posting C questions on the forum would have had at least some hint to what their problem was if they had been using the diagnostics. Unfortunately, telling people to enable warnings is incompatible with te...
by ejolson
Fri Nov 04, 2016 11:42 pm
Forum: The MagPi
Topic: MagPi 47 - An Introduction to C - Page 62
Replies: 39
Views: 20838

Re: MagPi 47 - An Introduction to C - Page 62

Give it a go https://cmake.org/cmake-tutorial/ it's so much simpler because there's no arcane syntax requirements (like tabs). Thanks for the link. Replacing a makefile that looks like tutorial: tutorial.cxx g++ -o tutorial tutorial.cxx with the tab-free cmake version cmake_minimum_required (VERSIO...
by ejolson
Fri Nov 04, 2016 5:18 am
Forum: General discussion
Topic: "Full" Linux on Pi?
Replies: 69
Views: 15999

Re: "Full" Linux on Pi?

Define "Full Linux" please. I don't think the original poster meant full Linux; they apparently meant LinuxCNC. That requires a low-latency real-time kernel to run the steppers that control milling machines and 3D printers. Maybe the title of the post should be changed to RTAI Linux on Pi , but cha...
by ejolson
Fri Nov 04, 2016 5:04 am
Forum: General discussion
Topic: Failover
Replies: 12
Views: 3927

Re: Failover

Some routers have this functionality built-in. My Asus router has a Dual-WAN mode that can operate in load-balancing or failover mode, and it can use a USB 3G/4G modem as the second WAN. My Cisco RV-320 has the same feature for DMZ and also includes Dual Stack. Those of us that do invest in better ...
by ejolson
Fri Nov 04, 2016 1:08 am
Forum: General discussion
Topic: "Full" Linux on Pi?
Replies: 69
Views: 15999

Re: "Full" Linux on Pi?

LinuxCNC appears to be compiled for Intel x86 processors. You would have to find a version compiled for ARMv7 or ARMv8. "Full" Linux is not an x86 version. Linux follows Unix. Unix was developed on a processor with less functionality than x86 processors and was compiled onto machines of many archit...
by ejolson
Fri Nov 04, 2016 12:42 am
Forum: General discussion
Topic: "Full" Linux on Pi?
Replies: 69
Views: 15999

Re: "Full" Linux on Pi?

I did use the search function first but I couldn't find anything related, forgive me if a thread already exists. I get very little time to do anything with my Pi so I'm still very much a novice in the RasPi world, somebody mentioned to me the other day that you can now run a "full" version of Linux...
by ejolson
Fri Nov 04, 2016 12:03 am
Forum: General discussion
Topic: Failover
Replies: 12
Views: 3927

Re: Failover

Some routers have this functionality built-in. My Asus router has a Dual-WAN mode that can operate in load-balancing or failover mode, and it can use a USB 3G/4G modem as the second WAN. I didn't know such things existed. Can it seamlessly migrate an open ssh connection between the primary and seco...
by ejolson
Thu Nov 03, 2016 6:28 pm
Forum: The MagPi
Topic: MagPi 47 - An Introduction to C - Page 62
Replies: 39
Views: 20838

Re: MagPi 47 - An Introduction to C - Page 62

for beginners, make or makefile should be explained so that they can understand the basics. But after having explained that make and makefile in a tutorial, one should proceed using an IDE like Geany (which already has been introduced in the MagPi tutorial) for compile, debug, build, and run, which...
by ejolson
Thu Nov 03, 2016 5:34 pm
Forum: General discussion
Topic: Failover
Replies: 12
Views: 3927

Re: Failover

I'm hoping the vast majority of the traffic is directed over the local wifi and for a seamless transition to the USB 3G modem when the connection drops, then resume traffic back to the wifi when it's back online. The difficulty here is a seamless transition. The WiFi and 3G devices will be assigned...
by ejolson
Thu Nov 03, 2016 12:45 am
Forum: General programming discussion
Topic: Mac to RPi program to program
Replies: 8
Views: 2099

Re: Mac to RPi program to program

when I put a Pi on the net soon enough I see login attempts for user "pi" showing up in the logs. That is why I suggested discussing security of MQTT from the beginning. Setting up a Pi to turn on and off light bulbs is less fun if the entire Pi is subsequently controlled by an unauthorized third p...
by ejolson
Wed Nov 02, 2016 10:05 pm
Forum: General discussion
Topic: Who nicked my memory!
Replies: 41
Views: 5983

Re: Who nicked my memory!

Still you fail to answer the question you have been asked.... What instances of malware have you had on your Pi? Does the splash screen in Pixel count as malware? Most malware unfortunate enough to compromise a Raspberry Pi would either immediately erase itself to avoid detection or persistently wa...
by ejolson
Wed Nov 02, 2016 3:32 pm
Forum: Staffroom, classroom and projects
Topic: Sending email from school account using Python
Replies: 15
Views: 7621

Re: Sending email from school account using Python

If both the RPi and the recipient are on the same network, why are you bothering to email the data? Can't the class access the data directly from the RPi? I agree that would be the simple solution. But I would prefer the email route. The reason being, the children are only 6/7 years old. My wife is...
by ejolson
Wed Nov 02, 2016 6:38 am
Forum: General discussion
Topic: init_resize.sh suggestion
Replies: 7
Views: 3472

Re: init_resize.sh suggestion

ShiftPlusOne wrote:Everybody needs to expand the partition at some point, but only a few need to shrink it.
It seems a mistake to automate simple things that instead could serve as small steps in a gentle learning curve for understanding how computers work.
by ejolson
Tue Nov 01, 2016 6:26 pm
Forum: The MagPi
Topic: MagPi 47 - An Introduction to C - Page 62
Replies: 39
Views: 20838

Re: MagPi 47 - An Introduction to C - Page 62

Surely there must be a better way than introducing people to the syntactically challenged, formatting challenged, and semantically challenged makefile format? Students seem to understand easily the idea of a recipe that requires certain ingredients and a procedure to combine those ingredients to cr...
by ejolson
Tue Nov 01, 2016 5:26 pm
Forum: The MagPi
Topic: MagPi 47 - An Introduction to C - Page 62
Replies: 39
Views: 20838

Re: MagPi 47 - An Introduction to C - Page 62

I see that your book is licenced under Creative Commons and claimed to be open source on the website. I would like to make some simple changes for my students. Are there easily-modified source files available for the book or should I use a pdf editor? It appears that Xournal will work well enough f...
by ejolson
Tue Nov 01, 2016 4:54 pm
Forum: Staffroom, classroom and projects
Topic: Sending email from school account using Python
Replies: 15
Views: 7621

Re: Sending email from school account using Python

My wife has a school email address of the form xxx.yyy@school.authority.sch.uk Presumably your wife wants to send appointment reminders to herself through email using a Raspberry Pi. Depending on how her work email is set up, this may be easier or harder. Why not send the reminders from a different...

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