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by mattmiller
Wed May 13, 2015 3:42 pm
Forum: Off topic discussion
Topic: Freedom pop arrives in the UK - free sim with free data
Replies: 11
Views: 1597

Re: Freedom pop arrives in the UK - free sim with free data

When something looks too good ......
by mattmiller
Fri May 01, 2015 9:25 pm
Forum: Scratch
Topic: WeDo + Scratch working!
Replies: 7
Views: 3860

Re: WeDo + Scratch working!

It might be worth trying to use the original version of Scratch just in case its an issue with the latest version

Try running opening up LX Terminal and typing
/usr/bin.scratch.old
by mattmiller
Tue Apr 21, 2015 8:35 am
Forum: Automation, sensing and robotics
Topic: "Pure" RaspPI Line-following Robot
Replies: 3
Views: 522

Re: "Pure" RaspPI Line-following Robot

You don't need a "board" as such but you need to add some electronics which is a lot tidier on a board than individual bits with wires all over the place
by mattmiller
Thu Apr 09, 2015 10:15 am
Forum: Automation, sensing and robotics
Topic: Pi, servos and LASER BEAMS
Replies: 6
Views: 1275

Re: Pi, servos and LASER BEAMS

i believe the trick is to fix laser and control a mirror to direct beam as you'll get a movement magnification effect so less servo movement/effective faster servo movement
by mattmiller
Wed Apr 08, 2015 8:17 am
Forum: Off topic discussion
Topic: Interesting little board:CodeBug
Replies: 58
Views: 8785

Re: Interesting little board:CodeBug

Its nearly there - if you haven't backed it - do it now and push it over the top :)


https://www.kickstarter.com/projects/922345933/codebug
by mattmiller
Tue Apr 07, 2015 6:55 pm
Forum: Beginners
Topic: Nested GPIO code?
Replies: 2
Views: 443

Re: Nested GPIO code?

From the wiki http://sourceforge.net/p/raspberry-gpio-python/wiki/BasicUsage/ You can output to many channels in the same call (release 0.5.8 onwards). For example: chan_list = [11,12] # also works with tuples GPIO.output(chan_list, GPIO.LOW) # sets all to GPIO.LOW GPIO.output(chan_list, (GPIO.HIGH,...
by mattmiller
Fri Apr 03, 2015 8:38 pm
Forum: Automation, sensing and robotics
Topic: 10 stepper motors
Replies: 5
Views: 1212

Re: 10 stepper motors

Supposedly you can control steppers with just 2 wires/stepper :)

Not done it myself but Section 3 Page 14 has the wiring info on it
http://www.philadelphia.edu.jo/academic ... erface.pdf

worth trying out on 1 - all you need extra is a couple of resistors
by mattmiller
Thu Apr 02, 2015 8:51 pm
Forum: Picademy
Topic: VNC remote desktop via web browser
Replies: 55
Views: 112472

Re: VNC remote desktop via web browser

Always worth trying raspberry as a pi password
by mattmiller
Mon Mar 30, 2015 9:11 pm
Forum: Off topic discussion
Topic: Interesting little board:CodeBug
Replies: 58
Views: 8785

Interesting little board:CodeBug

The PiFace team are running a Kickstarter for a nice little I/O board aimed at education

https://www.kickstarter.com/projects/922345933/codebug

looks worth a look at
by mattmiller
Thu Mar 26, 2015 5:23 pm
Forum: Advanced users
Topic: Slow down Rpi 2 to work at same speed as Rpi B+
Replies: 11
Views: 2301

Re: Slow down Rpi 2 to work at same speed as Rpi B+

That'll save a bit of hardware unplugging and pluggin during testing :0

Is there a similar setting to restrict RAM that can easily be altered as well?
by mattmiller
Mon Mar 23, 2015 11:54 am
Forum: General discussion
Topic: Servo controlling
Replies: 1
Views: 521

Re: Servo controlling

Yes.

Sometimes surges on motors/servos can cause issues so a separate PSU for the +ve connction to the servo is always the gold-plated solution but for just one servo then it'll work >99% of time with no problem
by mattmiller
Wed Mar 11, 2015 8:59 am
Forum: General discussion
Topic: 5ghz wifi adapter?
Replies: 43
Views: 76884

Re: 5ghz wifi adapter?

As already stated before by others that one is working out of the box
Looking at your blog instructions "out of the box working" wouldn't be the description I'd use :)

But hopefully your configuration would work on Raspbian setups as well
Very tempting to buy a pair on Amazon to find out - Ta :)
by mattmiller
Tue Mar 10, 2015 11:58 am
Forum: Advanced users
Topic: Pi-Based Lander
Replies: 8
Views: 1137

Re: Pi-Based Lander

Well, getting it there is just about hitching a ride on a rocket headed that way. We'll need someone like Elon to pay for the extra fuel. Then, its the landing. I suggest a Beagle type approach but since Pi is a lot lighter we could use just some lightweight headshield and a big parachute. Pi should...
by mattmiller
Mon Mar 09, 2015 9:24 pm
Forum: Advanced users
Topic: Pi-Based Lander
Replies: 8
Views: 1137

Re: Pi-Based Lander

A pretty big catapult for starters!
by mattmiller
Mon Mar 09, 2015 7:46 am
Forum: General discussion
Topic: Shouldnt a Raspberry pi auto connect to wifi?
Replies: 6
Views: 1141

Re: Shouldnt a Raspberry pi auto connect to wifi?

Whats the best way to get your raspberry pi 2 to auto connect to a wifi connection on bootup ? For some reason, you must have a peculiar fault as once a Pi has been connected to a WiFi network using the WiFi Config tool, it should just automatically reconnect the next time you reboot. I've a a few ...
by mattmiller
Sun Mar 08, 2015 2:33 pm
Forum: Wanted
Topic: Bulk buy with more than Pi 2 B
Replies: 9
Views: 6143

Re: Bulk buy with more than Pi 2 B

No, it appears to be a $0.39 discount on orders of 5+.
Lol :)
by mattmiller
Sun Mar 08, 2015 12:01 pm
Forum: Wanted
Topic: Bulk buy with more than Pi 2 B
Replies: 9
Views: 6143

Re: Bulk buy with more than Pi 2 B

I order from RS they have a 39 cent discount for orders over quantity of 5
That seems to be an a very large amount of discount for such a small number!

How did you manage to get it?
by mattmiller
Fri Mar 06, 2015 10:23 am
Forum: Staffroom, classroom and projects
Topic: Chickens!
Replies: 5
Views: 2233

Re: Chickens!

I've not used a Pi for this but I did set something up for my girl's primary school a few years ago using a windows prog called Yawcam. We uploaded an image every 5 secs to a website but saved a picture locally every 1 sec. I'm sure the Pi could do this - just save locally 1/sec and uploaded every 5...
by mattmiller
Thu Mar 05, 2015 8:41 am
Forum: Beginners
Topic: Powering a 5VDC fan with GPIO, risk ?
Replies: 4
Views: 1751

Re: Powering a 5VDC fan with GPIO, risk ?

All motors need to be buffered from GPIO pins.

This is because a motor can also easily become a generator of electricity and permanently damage your Pi
by mattmiller
Sun Mar 01, 2015 8:38 am
Forum: Advanced users
Topic: Monitoring 2B core usage
Replies: 3
Views: 872

Re: Monitoring 2B core usage

Thanks both of you :)
by mattmiller
Sat Feb 28, 2015 7:36 pm
Forum: Advanced users
Topic: Monitoring 2B core usage
Replies: 3
Views: 872

Monitoring 2B core usage

Is it possible to see what each core is doing in terms of cpu load?
by mattmiller
Sat Feb 28, 2015 4:22 pm
Forum: Raspbian
Topic: Determining active IP address
Replies: 2
Views: 513

Re: Determining active IP address

For your small webserver bind it to inaddr-any (0.0.0.0) and you'll never need to care what interface is active.
That sounds a lot simpler :) Never heard of that one before - ta :)
by mattmiller
Sat Feb 28, 2015 11:30 am
Forum: Raspbian
Topic: Determining active IP address
Replies: 2
Views: 513

Determining active IP address

On my Pi, I allocate a static ip on my lan port and its also got a wireless dongle thats set for DHCP

How can I determine which connection is in use progmatically (Python or bash) as i'd liek to run a small python webserver and bind it to the right Ip address depedning which is in use?
by mattmiller
Thu Feb 26, 2015 8:17 am
Forum: Advanced users
Topic: gpio input on one pi to output pin on another pi
Replies: 5
Views: 1590

Re: gpio input on one pi to output pin on another pi

There many ways to do what you want. If you used WebOpi on the receiving Pi, you could write a prog to replace using the browser on the master Pi using the underlying HTTP protocols. Another popular way is to to use sockets directly and have a listening prog on the receiving pi and a transmit prog o...

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