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by timrowledge
Mon Jan 15, 2018 5:49 pm
Forum: General discussion
Topic: Powering multiple Raspberry Pis
Replies: 4
Views: 153

Re: Powering multiple Raspberry Pis

I have several Anker USB psus - a 2pprt, a 4port and a 6(or is it 5?) port and they al seem to work really well at powering several Pi at once. I fairly often have three or four running on my desk at once.

Definitely good buys.
by timrowledge
Tue Jan 09, 2018 7:47 pm
Forum: Add-ons
Topic: Screen to fit in place of Decora light switch
Replies: 5
Views: 200

Re: Screen to fit in place of Decora light switch

Not quite what the OP is asking for (no touch and somewhat small) but close enough that it might be interesting to some people - http://www.4dsystems.com.au/productpages/IoD-09/downloads/IOD-09_datasheet_R_1_1.pdf That has an ESP8266 included, which is a pretty good combination especially for US$20....
by timrowledge
Tue Jan 09, 2018 7:12 pm
Forum: Beginners
Topic: Sending Data from RPi to PC
Replies: 11
Views: 236

Re: Sending Data from RPi to PC

As WHH says, stick the Pi on the same network as the PC - much the simplest way to allow them to talk. Then put mosquitto on the PC and use an MQTT client on the Pi to make a really easy communication system.
by timrowledge
Sun Jan 07, 2018 5:28 am
Forum: B+ addons
Topic: PCA9685 servo/pwm hat daemon?
Replies: 1
Views: 255

Re: PCA9685 servo/pwm hat daemon?

OK, so absent any information whatsoever I made my own daemon. Starting from old and non-functioning servoblaster code I removed all the dma/pwm related stuff changed the name(s) to protect the guilty and point at the innocent completely rewrote the input parsing so it actually worked for '+X%' inst...
by timrowledge
Fri Jan 05, 2018 11:44 pm
Forum: Raspbian
Topic: RPi Zero W very slow?
Replies: 8
Views: 364

Re: RPi Zero W very slow?

Well, I get roughly half the number of bytecode/sec and ⅔ the sends/sec of my Pi3 when using the Squeak Smalltalk benchmarks, so I'm pretty impressed. The 'problem' with Pi performance is not that a Pi type SoC is slow but that so much contemporary software is very poorly optimised. Good grief, ther...
by timrowledge
Thu Jan 04, 2018 9:23 pm
Forum: General discussion
Topic: Mac OS X (or something very similar)
Replies: 3
Views: 189

Re: Mac OS X (or redirect me to something very similar)

And Apple most likely is never gonna do a macOS port (unless they do some kind of IoT port of macOS) because it's x86 instead of ARM and Apple only does first party. That's why macOS is only on Mac (unless you do Hackintosh, but is super slow). So basically your only option is to make it look like ...
by timrowledge
Tue Dec 19, 2017 6:50 pm
Forum: Raspbian
Topic: Raspi over XRDP, SD-Card copier does nothing
Replies: 3
Views: 215

Re: Raspi over XRDP, SD-Card copier does nothing

Xrdp and permissions have never seemed to work together very well. We had terrible problems trying to make Scratch run without sudo a couple of years ago. Even some simple built in commands (‘install’ comes to mind) couldn’t work. I eventually gave up and started using vnc. I hate how poorly it hand...
by timrowledge
Mon Dec 18, 2017 6:01 am
Forum: Beginners
Topic: Want a list of compatible webcams for Raspberry Pi 3B model which has Raspbian Stretch OS
Replies: 3
Views: 187

Re: Want a list of compatible webcams for Raspberry Pi 3B model which has Raspbian Stretch OS

There is a list of them on the elinux.org wiki with comments on the suitability of each.
by timrowledge
Mon Dec 18, 2017 5:59 am
Forum: Debian
Topic: Install .deb packages from x86-64 Debian Stretch Live DVD?
Replies: 16
Views: 785

Re: Install .deb packages from x86-64 Debian Stretch Live DVD?

Iexpress wrote:
Wed Dec 13, 2017 1:28 am
Thank you for explaining, I was thinking the Linux versions would be different per architecture while the .deb files were in a same standard format and work across distributions being interpreted or processed the same way.
That would be far too sensible an idea to ever get implemented.
by timrowledge
Mon Dec 18, 2017 5:57 am
Forum: Debian
Topic: Install .deb packages from x86-64 Debian Stretch Live DVD?
Replies: 16
Views: 785

Re: Install .deb packages from x86-64 Debian Stretch Live DVD?

I'm using a Pi 3 with Raspbian Stretch. Would this still be armhf or can we also use armARCH? I guess you’re thinking of AArch64 here, the 64bit v8 architecture and instruction set. So no, you can’t use that within Raspbian at the moment and possibly never. There are 64bit versions of assorted linu...
by timrowledge
Mon Dec 18, 2017 5:52 am
Forum: Raspbian
Topic: Set VNC resolution?
Replies: 14
Views: 653

Re: Set VNC resolution?

Not quite: disable vnc in the preferences so that it is not coupled to the ‘real’ screen. Then use ‘vncserver ‘ to make a virtual screen. You can specify the resolution of that screen with (IIRC) -randr 1280x1024 (for example). There are about forty-gazillion options to read about in the RealVNC doc...
by timrowledge
Sun Dec 17, 2017 5:40 pm
Forum: General discussion
Topic: How come the price hasn't gone down?
Replies: 44
Views: 2128

Re: How come the price hasn't gone down?

Hmm... My first ARM system cost £4000. (ARM Development system for BBC Micro. 4MB ARM1 3MHz) Hah! Mine was given to me by Acorn - one of those hand assembled “silver fox” prototypes with an ARM1. They upgraded it to ARM3 later an$ even the mighty ‘turbo’ version. Still got it, though it hasn’t powe...
by timrowledge
Sun Dec 17, 2017 12:30 am
Forum: B+ addons
Topic: PCA9685 servo/pwm hat daemon?
Replies: 1
Views: 255

PCA9685 servo/pwm hat daemon?

I've googled as much as I can think of on this but there appears to be no servoblaster-like daemon for controlling servos/pwm cia a PCA9685 HAT. If anyone knows of one I'd be delighted to be enlightened! Otherwise I'm going to have to try to write one and that isn't an especially big ambition of min...
by timrowledge
Thu Nov 30, 2017 11:05 pm
Forum: Raspbian
Topic: (Solved) unable to install 'libX11-dev' on new Stretch install
Replies: 3
Views: 277

Re: unable to install 'libX11-dev' on new Stretch install

Well to my astonishment , using a lowercase x made it work. Weird. It has worked with the upper case for four (five?) years but evidently something changed.

Thanks!
by timrowledge
Thu Nov 30, 2017 5:18 am
Forum: Raspbian
Topic: (Solved) unable to install 'libX11-dev' on new Stretch install
Replies: 3
Views: 277

(Solved) unable to install 'libX11-dev' on new Stretch install

I've been in the habit of installing a bunch of development libraries to support building Scratch etc but for the first time it's been a bit of a problem. On a fresh 2017-09-07 raspbian install I can't get libX11-dev to install. All the other packages were happy. Googlyising of various sorts has fai...
by timrowledge
Sat Nov 25, 2017 8:08 pm
Forum: General discussion
Topic: Getting more processing power from Raspberry Pi 3
Replies: 13
Views: 1034

Re: Getting more processing power from Raspberry Pi 3

My stock answer for lack of processing power is to examine your code for inefficiencies Exactly. As an example directly relevant to the Pi I took the original Scratch code base and re-engineered large parts of it to be cleaner and more efficient . That got us a factor of about eight improvement. Th...
by timrowledge
Sat Nov 11, 2017 5:47 pm
Forum: Beginners
Topic: Power 2 Pis with one power supply
Replies: 9
Views: 880

Re: Power 2 Pis with one power supply

It should be fine. I have an Anker 60w/6 port version that typically powers an Ethernet switch and 3or 4 Pi without problems.
by timrowledge
Wed Nov 01, 2017 5:38 pm
Forum: General discussion
Topic: Using C to Control GPIO
Replies: 19
Views: 1545

Re: Using C to Control GPIO

Last time I checked pigpio was included by default in Raspbian. I haven’t yet had reason to check the latest Stretch release.
by timrowledge
Tue Oct 31, 2017 5:54 pm
Forum: Off topic discussion
Topic: Industrial rated PI equivalent boards
Replies: 26
Views: 5577

Re: Industrial rated PI equivalent boards

Nice device, but ouch on the price (350euro).
by timrowledge
Fri Oct 27, 2017 4:27 pm
Forum: General discussion
Topic: Building Rasberry pi transmitter for drones
Replies: 2
Views: 238

Re: Building Rasberry pi transmitter for drones

Go to rczone.com

Find the multi-copter and diy electronics forums and read. Plenty of people have done similar projects ; basically you’ll need a fly sky RF module and programming to feed it the right signals.
by timrowledge
Tue Oct 24, 2017 6:04 pm
Forum: Astro Pi
Topic: Using an R-Pi 3 in the AstroPi (Confirmed Observation)
Replies: 4
Views: 957

Re: Using an R-Pi 3 in the AstroPi (Confirmed Observation)

Given that you have a plastic case that doesn’t need to meet ESA specs, it might be plausible to stick a small fan in there. Mmm, and some extra holes of course. Or you could get a machined aluminium case from us (www.astropicase.com); my demo unit has always had a Pi3 in it and seems to be happy. E...
by timrowledge
Wed Oct 18, 2017 6:04 pm
Forum: General discussion
Topic: Extremely New member - Models, release cadence, storage and power options.
Replies: 12
Views: 924

Re: Extremely New member - Models, release cadence, storage and power options.

If you're interested in using a Pi in a vehicle I have a couple of suggestions for useful add-ons to help handle the power and storage requirements. a) storage; the uSD cards are ok most of the time but they do seem to die after a lot of 'impolite' powering off. So, consider using an external usb SS...
by timrowledge
Mon Oct 16, 2017 7:02 pm
Forum: Cases
Topic: Astro Pi case
Replies: 0
Views: 875

Astro Pi case

Just in case (hah! see what I did there?) you haven't read the front page blog post, (https://www.raspberrypi.org/blog/astro- ... uest-post/) I'd just like to mention that you can now buy a CNC machined solid aluminium replica Astro Pi case from www.astropicase.com
DSC_0017.jpg
DSC_0017.jpg (36.81 KiB) Viewed 875 times
by timrowledge
Mon Oct 16, 2017 6:51 pm
Forum: Beginners
Topic: Is it possible to connect more than 5V to ground? <-- Warning Nonsense!
Replies: 34
Views: 2168

Re: Is it possible to connect more than 5V to ground? <-- Warning Nonsense!

Servo *power* and servo *signal* are two different things. Typically in a large model plane for example you might find the servo power leads connected to a 7.4v li-po but the control signals from the receiver might be anything from 4-7v depending on the exact type. So you'd (very simplistically) hav...
by timrowledge
Wed Oct 11, 2017 11:11 pm
Forum: Scratch
Topic: New Scratch things for Raspbian September 2016
Replies: 26
Views: 8997

Re: New Scratch things for Raspbian September 2016

Well first things first - re-awakening a year old zombie thread is not the smartest thing to do. Sometimes they get all feisty and try to chew your face off. Depending on exactly what you are trying to do you have several options. If you are running Scratch2 - the Flash based abomination in the eyes...

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