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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: 164

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: 164

(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: 757

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: 801

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: 1026

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: 4548

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: 168

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: 692

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: 804

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: 535

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 535 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: 1943

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: 8412

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...
by timrowledge
Thu Oct 05, 2017 10:01 pm
Forum: Off topic discussion
Topic: is software harder than hardware? :)
Replies: 43
Views: 6027

Re: is software harder than hardware? :)

Ronaldlees wrote:
Thu Oct 05, 2017 7:25 pm
I think very few software guys have those skills.
I think very few *people* have those skills, full stop. You only have to look at low level code to see that the number is much smaller than the number of people that do it.
by timrowledge
Thu Oct 05, 2017 9:55 pm
Forum: General discussion
Topic: Why no enthusiast Raspberry Pi products?
Replies: 53
Views: 3536

Re: Why no enthusiast Raspberry Pi products?

Note that if money was no object, we could get to maybe 2Ghz, octocore. But actually, that is not a huge increase, UNLESS your code is 8x multithreaded. Which a lot of code isn't. ARM cores don't really hit the performance figures of high end x86 yet. Actually I suspect you're wrong here. The lates...
by timrowledge
Wed Oct 04, 2017 7:21 pm
Forum: General discussion
Topic: Expecting too much from a little PI?
Replies: 8
Views: 732

Re: Expecting too much from a little PI?

Pis are cheap. Use one per camera/monitor. Use another for your system monitor. By comparison to the likely value of 3 or 4 monitrs plus relays, batteries, motors etc the Pi cost is nothing. You can get relay driver HATs with up to 8 relays (I think I've even seen 16) quite easily (I found a review ...
by timrowledge
Mon Oct 02, 2017 7:58 pm
Forum: Astro Pi
Topic: Sense Hat and greek fonts
Replies: 4
Views: 1141

Re: Sense Hat and greek fonts

There are some quite complicated character glyphs in Greek - will they actually display well enough to be useful on an 8x8 coarse grid display?
by timrowledge
Mon Oct 02, 2017 5:17 pm
Forum: General discussion
Topic: Send DS18B20 data thru router 'directly'
Replies: 2
Views: 157

Re: Send DS18B20 data thru router 'directly'

Go to wemos.cc Buy a D1 mini pro and an SHT30 shield - total price around $10. Wait for delivery. Use Arduino IDE and install the ESP8266 support. Load SHT30 and Mqtt libraries. Find an example of reading the SHT, and hack together with mqtt. Power from an old iPhone charger (because it has USB sock...
by timrowledge
Sat Sep 30, 2017 7:17 pm
Forum: General programming discussion
Topic: Development Environment
Replies: 5
Views: 1419

Re: Development Environment

I have a Mac and would like to do the coding on it and download the software to a Raspberry PI. Then run the Raspberry PI with the touch screen There's no very good reason to work this way; the Pi is perfectly able to handle editing your code and so on. I also have a Mac and a bunch of Pis; I don't...
by timrowledge
Fri Sep 22, 2017 5:36 pm
Forum: General programming discussion
Topic: C or C++ ?
Replies: 21
Views: 2406

Re: C or C++ ?

When you iterate across the collection to do something with each item you send 'do something' to each one and it looks up what it does in response. Does it really in practice do that for all objects? Even for simple primitive types? Or is it conceptual and just gives the appearance of doing it? The...
by timrowledge
Fri Sep 22, 2017 1:02 am
Forum: General programming discussion
Topic: C or C++ ?
Replies: 21
Views: 2406

Re: C or C++ ?

It's obvious that two evidently long-experienced (I won't say old because I'm not old. Notnotnot. So there) software dweebs are not going to necessarily agree on matters of religion. It's nice to be able to debate whilst remains decently polite. Squeak Smalltalk has an FFT class built in; I'm no exp...
by timrowledge
Fri Sep 22, 2017 12:12 am
Forum: Scratch
Topic: NuScratch Source
Replies: 2
Views: 1306

Re: NuScratch Source

I'm not sure how I missed the original post, but it was nearly two years ago. Anyway, you are doing it wrong(™). You don't expect to be able to open up behind the scenes of a Excel and read the sources, make changes and carry on; you can't expect a reliable development experience by trying the same ...
by timrowledge
Mon Sep 18, 2017 3:10 am
Forum: General programming discussion
Topic: C or C++ ?
Replies: 21
Views: 2406

Re: C or C++ ?

@tim: How does Ruby match up to your criteria? I have a very limited knowledge of Ruby, mostly from writing some extension code for SketchUp a few years ago. I really didn't like it as a programming experience. I certainly wouldn't recommend it to anyone I like. My only other exposure to it was waa...
by timrowledge
Sun Sep 17, 2017 6:27 pm
Forum: General programming discussion
Topic: C or C++ ?
Replies: 21
Views: 2406

Re: C or C++ ?

Well, yeah, I'm a Smalltalker (note the lower case 't' in the middle, Heater. Wouldn't want to have to send the Boys round to take you for a quick visit with Dinsdale, now would we ;-) ) these last 35 years (out of ~45 of playing with computerise things). Obviously I'm opinionated but I think I can ...
by timrowledge
Sat Sep 16, 2017 6:20 pm
Forum: General programming discussion
Topic: C or C++ ?
Replies: 21
Views: 2406

Re: C or C++ ?

C++ is a layer of really badly thought out 'object' stuff dumped on top of C. If you wants objects, use a proper object oriented language instead; use C for the stuff it is good at which is basically being a fairly portable pseudo-assembler.
by timrowledge
Sat Sep 16, 2017 6:15 pm
Forum: Scratch
Topic: Itchy problem :)
Replies: 5
Views: 1206

Re: Itchy problem :)

Or run the Scratch 1.4 that is still installed. It's almost certainly faster, doesn't use the abomination-known-as-Flash and still works nicely whether online or offline.

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