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by timrowledge
Wed Sep 19, 2018 8:08 pm
Forum: Scratch
Topic: New Scratch things for Raspbian September 2016
Replies: 31
Views: 11470

Re: New Scratch things for Raspbian September 2016

OK, first, I can't see any evidence of the bug and indeed nor can several other people that have tested for me. So that's a bit odd. The main shell script to start Scratch 1.4 /NuScratch is '/usr/bin/scratch'. 7 or 8 lines down you should see IMAGE=`ls -t /usr/share/scratch/NuScratch*.image| head -1...
by timrowledge
Tue Sep 18, 2018 6:48 pm
Forum: Scratch
Topic: New Scratch things for Raspbian September 2016
Replies: 31
Views: 11470

Re: New Scratch things for Raspbian September 2016

Well nothing has been changed in the nuscratch world of course since the insanity of allowing Flash on the Pi. That only really leaves some sort of OS release build problems or an OS change that messes up key events. Neither is a very nice idea. If you are brave enough, rename the image file (probab...
by timrowledge
Tue Sep 18, 2018 6:41 pm
Forum: Scratch
Topic: STICKY: Bugs and regressions
Replies: 37
Views: 18801

Re: STICKY: Bugs and regressions

That suggests that the VM tried to connect to the sound driver and couldn’t find it. First thing is to check that you ran ‘/usr/bin/nuscratch’ in order to run the latest version. If that still fails, try ‘sudo nano /usr/bin/nuscratch’ and it ought to be including something like ‘-vmsound alsa’ (I’ll...
by timrowledge
Mon Aug 13, 2018 3:51 pm
Forum: General discussion
Topic: Desktop less (Linux based) OS for RPI
Replies: 19
Views: 639

Re: Desktop less (Linux based) OS for RPI

Raspbian lite and Squeak in framebuffer mode.
by timrowledge
Tue Jul 03, 2018 4:14 pm
Forum: Beginners
Topic: Getting started with development on Mac?
Replies: 1
Views: 86

Re: Getting started with development on Mac?

Download Raspbian Download Etcher Put sd card in slot in USB card reader (or direct, if your Mac has one) Run Etcher Remove sd card. Reinsert ssd card Write an empty file named ‘ssh’ to the visible partition. To use wifi, write wpa_supplicant file to visible partition- see docu for details of what g...
by timrowledge
Sat Jun 30, 2018 5:09 pm
Forum: Beginners
Topic: Are there any Scratch tutorials?
Replies: 2
Views: 127

Re: Are there any Scratch tutorials?

Try scratch.mit.edu for a start.

There are so many Scratch tutorials out there it would be hard to count them. Try http://scratched.gse.harvard.edu
http://courses.ucodemy.com/v2/
Google for ladies learn code and/or kids learn code
That should get you started.
by timrowledge
Fri Jun 22, 2018 6:27 am
Forum: Other projects
Topic: Terminal for Pi
Replies: 2
Views: 299

Re: Terminal for Pi

You know there’s the Pi-Top laptop available, right? And indeed their CEED desktop unit.
by timrowledge
Sun Jun 10, 2018 8:43 pm
Forum: General discussion
Topic: Does the Pi's CE certification include UL94/ISO9772/3 etc?
Replies: 5
Views: 468

Re: Does the Pi's CE certification include UL94/ISO9772/3 etc?

I'm no expert on this either. I was hoping that someone that is might be able to point to a part of the relevant CE standard that gives a clear indication of whether or not the UL94 related stuff is included. Since the Pi has a CE, that would make a nice simple explanation for those customers that k...
by timrowledge
Fri Jun 08, 2018 9:56 pm
Forum: General discussion
Topic: Does the Pi's CE certification include UL94/ISO9772/3 etc?
Replies: 5
Views: 468

Re: Does the Pi's CE certification include UL94/ISO9772/3 etc?

The base PCB itself is UL94, but we have not tested the entire product, and are unlikely to do so in the near future. I can't imagine how much cost and hassle all this testing involves. So many things to be tested for! I was hoping that getting CE certified would actually cover all of it in one nea...
by timrowledge
Thu Jun 07, 2018 8:46 pm
Forum: General discussion
Topic: Does the Pi's CE certification include UL94/ISO9772/3 etc?
Replies: 5
Views: 468

Does the Pi's CE certification include UL94/ISO9772/3 etc?

I *think* from what I've been able to find that CE certification includes UL94 (catching fire related stuff) under ISO 9772/3. Does anyone know for sure either way?
by timrowledge
Thu May 24, 2018 8:54 pm
Forum: General discussion
Topic: Why does the RPF care about how many desktops I have ?
Replies: 16
Views: 1236

Re: Why does the RPF care about how many desktops I have ?

ShiftPlusOne wrote:
Thu May 24, 2018 4:00 pm
Making complicated things easy is complicated.
Hell, in the software world making easy things easy seems to be too complicated for most developers.
by timrowledge
Sat May 19, 2018 10:44 pm
Forum: Beginners
Topic: Best Pi for servo usage.
Replies: 7
Views: 611

Re: Best Pi for servo usage.

The pca9685 pwm based hats are pretty good for driving servos, especially if you are using quite a few. As joan says you can do all the control signal stuff directly with pigpio but I feel there is a bit of simplification possible by using a pca. In fact I wrote a simple daemon to use pipiod for tha...
by timrowledge
Fri May 11, 2018 10:08 pm
Forum: Astro Pi
Topic: Replica Astro Pi Case still available?
Replies: 11
Views: 2031

Re: Replica Astro Pi Case still available?

And we're back. Wonder what the next exciting Wordpress hack will do?
by timrowledge
Wed May 09, 2018 6:11 pm
Forum: General discussion
Topic: Using your Pi with an SSD (Solid State Drive)
Replies: 45
Views: 8823

Re: Using your Pi with an SSD (Solid State Drive)

MY SSD is a dirt-cheap KingDian 32Gb unit
by timrowledge
Fri May 04, 2018 6:31 pm
Forum: Beginners
Topic: DIGITAL servo control with raspberry pi zero w
Replies: 7
Views: 627

Re: DIGITAL servo control with raspberry pi zero w

Pretty much any servo you buy will be one intended for model usage and will work from a pulse width signal. Older ones (and I suppose some cheaper ones) use analogue circuitry to convert that pulse width to a voltage that provides the circuit with a value to aim at and the motor moves the servo arm ...
by timrowledge
Wed May 02, 2018 6:33 pm
Forum: Astro Pi
Topic: Replica Astro Pi Case still available?
Replies: 11
Views: 2031

Re: Replica Astro Pi Case still available?

Looks like your site is down again. Did someone hack you again? Sigh, yes. It seems Wordpress is a favourite target for dimwit script-kiddies etc. In the meantime if you are wanting to buy a replica Astro Pi case please try emailing [email protected].com Ah, actually I’ll have to double check that a...
by timrowledge
Thu Apr 26, 2018 9:48 pm
Forum: Add-ons
Topic: PCA9685 servo/pwm hat daemon?
Replies: 3
Views: 1824

Re: PCA9685 servo/pwm hat daemon?

by timrowledge
Thu Apr 26, 2018 9:45 pm
Forum: General discussion
Topic: PiCam Servo Control
Replies: 4
Views: 240

Re: PiCam Servo Control

I finally got around to github'ing my pca9685 daemon.

https://github.com/timrowledge/pca9685servodaemon
by timrowledge
Wed Apr 25, 2018 6:23 pm
Forum: General discussion
Topic: compute or RPi 3 B/B+ motherboard sized for ITX case
Replies: 5
Views: 391

Re: compute or RPi 3 B/B+ motherboard sized for ITX case

Why would you want to put a Raspberry Pi into such a huge case (relatively speaking)? One of the great things about the Pi is how small it is. What's the thought process behind wanting to make it unnecessarily large? There are plenty of times when you want a bunch of stuff attached to the Pi; PSU &...
by timrowledge
Sun Apr 22, 2018 4:15 pm
Forum: General discussion
Topic: Power
Replies: 14
Views: 612

Re: Power

I use Anker 4 & 6 port USB chargers with short leads. Now, I can’t say if either would handle a full load of 3B+ with external hard drives since I don’t have 4 3B+ to test, but I haven’t yet had any problems with 2s and 3s.
by timrowledge
Sat Apr 14, 2018 5:15 pm
Forum: General discussion
Topic: Using your Pi with an SSD (Solid State Drive)
Replies: 45
Views: 8823

Re: Using your Pi with an SSD (Solid State Drive)

Hmph; I'm sure I 'successfully' posted this yesterday, but never mind. My new Pi 3B+ was slotted into the X820 board, connected up, and booted straight away. Similarly the other 3B+ booted immediately from the usb->sata external drive. Both, obviously, having been updated & upgraded. The X820 is par...
by timrowledge
Sat Apr 14, 2018 2:02 am
Forum: General discussion
Topic: Loaded Question? Best Arduino Model To Use With Pi?
Replies: 2
Views: 183

Re: Loaded Question? Best Arduino Model To Use With Pi?

Take a look at Pete Scargill's blog - he's been adding Arduino nano's to ESP8266's for the same purpose and the principle will be the same since he uses an i2c link.

https://tech.scargill.net/the-nano-peripheral-update/
by timrowledge
Tue Apr 10, 2018 3:51 pm
Forum: Beginners
Topic: Raspberry with ADC chip
Replies: 6
Views: 267

Re: Raspberry with ADC chip

Get an 8 channel adc. There are plenty of them out there.

Googling for “i2c adc 8 channel” produces plenty of options.
by timrowledge
Mon Apr 09, 2018 5:10 pm
Forum: Other projects
Topic: Motion detection using Raspberry Pi
Replies: 4
Views: 526

Re: Motion detection using Raspberry Pi

The Motion image library is provided in Raspbian. The MotionEye package ties that to a web server and some hooks to make using a Pi as a motion tracking camera.
Googling MotionEye will get you a lot of useful info.
by timrowledge
Sun Apr 08, 2018 7:32 pm
Forum: General discussion
Topic: PiCam Servo Control
Replies: 4
Views: 240

Re: PiCam Servo Control

Whilst you can drive servos very well directly from pigpio - remembering to provide a separate power supply- you might benefit from a little daemon I wrote to drive a PCA9685 based board like the adafruit or SparkFun pwm boards. The advantage is the hardware isolation and simple software control. On...

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