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by jackokring
Tue Jul 22, 2014 4:04 pm
Forum: HATs and other add-ons
Topic: Preliminary B+ HAT (Hardware Attached on Top) docs/specs
Replies: 106
Views: 37071

Re: Preliminary B+ HAT (Hardware Attached on Top) docs/specs

So apart from not driving pin 36 from a hat (in case of old firmware booting), and a P1-13 collision??? there appear to be few limits. It's just most hardware is socket interface defined first, not in terms of 3 or 4 mappings of GPIO. EDIT: I suggest a bold PIN 31 AND 36 ARE NOT ADVISED TO BE INPUTS...
by jackokring
Tue Jul 22, 2014 12:22 pm
Forum: HATs and other add-ons
Topic: Preliminary B+ HAT (Hardware Attached on Top) docs/specs
Replies: 106
Views: 37071

Re: Preliminary B+ HATs docs/specs are here

do the older boards now have a need to not use I2C address 0, on the bus before the switch around? And there is the obvious omission of a 3V3 within the new pins. Not quite sure I understand the question. Got it. Just me being muddled for a while. It all sounds a bit like the apple mac color bus wi...
by jackokring
Mon Jul 21, 2014 8:28 pm
Forum: HATs and other add-ons
Topic: Preliminary B+ HAT (Hardware Attached on Top) docs/specs
Replies: 106
Views: 37071

Re: Preliminary docs are up

The title is vague, at least from the new posts click link, and the content is/was not apparent. But having read, I see. For most simple people stacking is out, which is good. Being able to override the EEPROM with a stacked user choice is essential although rare, otherwise why buy some boards? Or m...
by jackokring
Sun Jul 20, 2014 9:53 pm
Forum: General discussion
Topic: Maths and computers
Replies: 16
Views: 2705

Re: Maths and computers

Mathematics never becomes vague. It can be used to make estimates, but this is not vague, as the exact nature of the error in the estimate is part of the maths. Pade approximation is an interesting area of maths. :D :D The use of binary to represent maths without number using formal symbolic maths i...
by jackokring
Sun Jul 20, 2014 7:20 pm
Forum: Beginners
Topic: Raspberry Pi emulator?
Replies: 5
Views: 1227

Re: Raspberry Pi emulator?

tried the easy qemu thing, but with -hda /dev/sda (my first disk, as I boot from the second via bios option), and root=/dev/sda1 (as the fat32 is second in the partition table), and it gives a scsi abort error. Not really in need of hours of messing about when it should just work.
by jackokring
Sat Jul 12, 2014 12:12 pm
Forum: General discussion
Topic: Consider adding a FPGA to a new model?
Replies: 15
Views: 4671

Re: Consider adding a FPGA to a new model?

The pif from bugblat is also available. The design tools for FPGA development will not run on a Pi.
by jackokring
Sat Jun 28, 2014 4:05 pm
Forum: Beginners
Topic: Symbols Mixup
Replies: 7
Views: 1012

Re: Symbols Mixup

# is unshifted ~ on my kbd. Sounds like you have the UK keyboard map, so what language is the keyboard?
by jackokring
Sun May 11, 2014 12:39 am
Forum: General discussion
Topic: wolfram-engine why u so big!???
Replies: 2
Views: 717

Re: wolfram-engine why u so big!???

Code: Select all

Solve[x^3 + 29 x + 44 == 0, x]
entered and shift+return keys does the calculation for an example of the built in, and this is simple compared to the more complex things it can solve and compute.
by jackokring
Wed May 07, 2014 12:11 am
Forum: Automation, sensing and robotics
Topic: Can i use this transistor instead of a relay
Replies: 78
Views: 11442

Re: Can i use this transistor instead of a relay

The inductive (big) capacitive (small) for the scale efficiency effects may make a desire to make a capacitive fan, but the electrostatic potential to move an object by a capacitive electric field, rather than an inductive *magnetic* field means most motors present themselves as inductive. The power...
by jackokring
Tue Apr 29, 2014 10:11 pm
Forum: Automation, sensing and robotics
Topic: Can i use this transistor instead of a relay
Replies: 78
Views: 11442

Re: Can i use this transistor instead of a relay

In a transistor circuit such as this you should use a current limit resistor in the GPIO to base. And also you should use a "backing" diode on the fan to stop the switched off fan from creating a large voltage leading to secondary Vbc over voltage junction avalanche breakdown. This effect will event...
by jackokring
Mon Apr 28, 2014 8:34 pm
Forum: General programming discussion
Topic: Obstacle Avoidance Algorithm using Ultrasonic Sensor
Replies: 3
Views: 2532

Re: Obstacle Avoidance Algorithm using Ultrasonic Sensor

Makes me wonder if the origin of using the other side of the brain to process is related to this. The "nose" stimulation has to be wired to the other side's "paddle" or leg stimulation.
by jackokring
Wed Apr 23, 2014 10:34 pm
Forum: Other programming languages
Topic: Easy wav file playing in fpc
Replies: 0
Views: 851

Easy wav file playing in fpc

uses unix; shell('aplay sound.wav 2> /dev/null &'); The above plays sound.wav in the program directory, and does not ruin a text display, and also plays the sound in the background. The is a very small delay before the sound is played. If all you want is simple sound, then this is much easier to us...
by jackokring
Tue Apr 22, 2014 8:11 pm
Forum: General programming discussion
Topic: Maynard/Weston/Wayland/X?
Replies: 7
Views: 4529

Maynard/Weston/Wayland/X?

Well the video of Maynard looks good. The graphical layers are a little confusing even to the advanced user. So if I understand it correctly, the desktop Maynard runs on the Weston server, and Wayland is a bit of a red herring, being the protocol API. As for X, it seems that an X server could run on...
by jackokring
Tue Apr 22, 2014 11:44 am
Forum: Troubleshooting
Topic: Run two things simultaneously at startup...
Replies: 9
Views: 1502

Re: Run two things simultaneously at startup...

& backgrounds a process && runs the one after the first completes on success | takes output of before to input of after and runs both || runs the after if the before fails with an error Also useful is CTRL+Z followed by the command bg 1 to background the halted process. The number is the one given i...
by jackokring
Sun Apr 20, 2014 7:50 pm
Forum: Other projects
Topic: Automobile cigarette lighter ground noise
Replies: 7
Views: 2563

Re: Automobile cigarette lighter ground noise

This is a matter of decoupling the apparent DC (with AC ignition/spark noise) back to something closer to DC. but as your kit costs more than my experience, this is for sale, not free. EDIT: not a Pi problem. A electronic problem with any such device without large amounts of DC regulation. EDIT2; DC...
by jackokring
Sun Apr 20, 2014 1:35 pm
Forum: Other programming languages
Topic: Free Pascal Install after Lazarus
Replies: 2
Views: 1443

Re: Free Pascal Install after Lazarus

I will upgrade when it comes on Jessie. At present I'm still building the unit set I need to make my program. https://github.com/jackokring/rub. At the moment absolute performance is less of a problem than getting used to the dialect, and standard functions.
by jackokring
Sun Apr 20, 2014 1:30 pm
Forum: Other programming languages
Topic: Freepascal 2.7.1 Daily builds
Replies: 9
Views: 5896

Re: Freepascal 2.7.1 Daily builds

I use

Code: Select all

fp
at the terminal. I just don't need Lazarus at the moment, though I may later when I need a GUI for my code. Just wondering if ansichar 0 can be accessed from an ansistring as an array index yet? Cos the apparent warning is actually flagged as an error.
by jackokring
Fri Apr 18, 2014 5:51 pm
Forum: Beginners
Topic: Best OS for a simple non-GUI project
Replies: 14
Views: 7584

Re: Best OS for a simple non-GUI project

This is quite an involved question, and does depend on the availability of space on the SD for bloat, or if you need a minimal development system. the non GUI aspect does not necessarily mean no GUI programs on the SD, as a 8 GB card weighs about the same as a 4 GB card. Raspbian! Although some woul...
by jackokring
Fri Apr 18, 2014 11:25 am
Forum: Troubleshooting
Topic: Cambridge Bluetooth causing PI to crash
Replies: 19
Views: 2686

Re: Cambridge Bluetooth causing PI to crash

The one I had was a very power hungry dongle of this type. No problems with a powered hub.
by jackokring
Thu Apr 17, 2014 11:53 pm
Forum: General discussion
Topic: new website too slow and heavy!!
Replies: 22
Views: 3654

Re: new website too slow and heavy!!

The "too much money buys a large HDMI screen and a super fast computer, and it don't look slow or bad to them syndrome."
by jackokring
Wed Apr 16, 2014 3:58 pm
Forum: Java
Topic: Headless?
Replies: 12
Views: 3965

Re: Headless?

I think this is an apt-get dependency chain question. Will removing X remove the java 8?
by jackokring
Wed Apr 16, 2014 12:26 pm
Forum: General discussion
Topic: secure my code
Replies: 21
Views: 3560

Re: secure my code

Without some private key being built in to the execution hardware, securing code is impossible. Even with a private key decoder built in, eventually with enough code the security could be broken. Also decoding encryption, even in the hardware, before running the code would make it very slow. There i...
by jackokring
Tue Apr 15, 2014 4:39 pm
Forum: Networking and servers
Topic: Heartbleed - regenerate server certificates
Replies: 5
Views: 1425

Re: Heartbleed - regenerate server certificates

It's this sort of stuff that's inspired me to write my own encryption. https://github.com/jackokring/rub/blob/ ... crypto.pas which is not complete yet, but I'm getting there.

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