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by MattHawkinsUK
Thu Mar 20, 2014 10:13 am
Forum: Beginners
Topic: Motion Detecting Camera to Trigger LCD Text?
Replies: 7
Views: 1487

Re: Motion Detecting Camera to Trigger LCD Text?

Use a PIR sensor as it saves messing around with image processing. The sensors are cheap and easy to implement.

http://www.raspberrypi-spy.co.uk/2013/0 ... pi-part-1/

Once you detect movement you can use the camera Python library to do your camera stuff.
by MattHawkinsUK
Tue Mar 18, 2014 11:34 am
Forum: Automation, sensing and robotics
Topic: HC-SR04 ultrasonic sensor to my raspberry pi
Replies: 6
Views: 5863

Re: HC-SR04 ultrasonic sensor to my raspberry pi

Here is my blog post on how to connect an ultrasonic sensor to the Raspberry Pi : http://www.raspberrypi-spy.co.uk/2012/12/ultrasonic-distance-measurement-using-python-part-1/ The device is powered from 5V but the echo output needs to be voltage divided to ensure the Pi GPIO doesn't see more than 3....
by MattHawkinsUK
Thu Mar 13, 2014 2:28 pm
Forum: Other projects
Topic: How to make a custom case ?
Replies: 11
Views: 12079

Re: How to make a custom case ?

You can get LED clips. They are usually black and allow you fix standard size LEDs into a surface.
by MattHawkinsUK
Wed Mar 12, 2014 3:56 pm
Forum: Raspbian
Topic: Shut down and reboot
Replies: 5
Views: 1488

Re: Shut down and reboot

You can use the P6 header to reset the Pi after it has shutdown. It saves you needing to unplug the power cable. Requires a push-to-make switch to be soldered to the PCB.
by MattHawkinsUK
Mon Mar 10, 2014 8:21 am
Forum: General discussion
Topic: Smooth start for a 10 year old
Replies: 4
Views: 957

Re: Smooth start for a 10 year old

Take a look at "Adventures in Raspberry Pi" By Carrie Anne Philbin. It is ideal for your requirements. Available at all good book shops. And Amazon.

http://www.amazon.co.uk/Adventures-Rasp ... 1118751256
by MattHawkinsUK
Sun Mar 09, 2014 11:19 pm
Forum: Off topic discussion
Topic: My Blog
Replies: 5
Views: 1145

Re: My Blog

Good work :D
by MattHawkinsUK
Thu Mar 06, 2014 7:16 pm
Forum: General discussion
Topic: The $200 RasPi
Replies: 8
Views: 1408

Re: The $200 RasPi

Looks like a Cyntech case complete with SD card cover. They are about £5-£6.

I would have expected an 8GB card for my $200!
by MattHawkinsUK
Wed Mar 05, 2014 2:00 pm
Forum: Staffroom, classroom and projects
Topic: New Resource Organisation
Replies: 1
Views: 1343

New Resource Organisation

Good to see the links on the Hour of Code page organised by Key Stage. I don't know how the new site will organise them so my comments below may be redundant but ... ... I was speaking to someone about the new resources and one thing we decided was that they need to be categorised in some way. In th...
by MattHawkinsUK
Tue Mar 04, 2014 9:49 pm
Forum: General programming discussion
Topic: [Python] Saving to a folder
Replies: 5
Views: 8913

Re: [Python] Saving to a folder

Your save path needs a / before the 'home'. You also need to move those last two lines before you start recording. Otherwise they aren't affecting the filename you are telling the camera to use. You also need to tell the start_recording function to use completed_video as its file so it gets the full...
by MattHawkinsUK
Tue Mar 04, 2014 9:25 pm
Forum: Beginners
Topic: I am at my wits end
Replies: 13
Views: 2885

Re: I am at my wits end

Not sure a Bluetooth keyboard would be activate until the OS had almost finished booting?

How did you write the Raspbian IMG to the SD card?
by MattHawkinsUK
Mon Feb 17, 2014 11:34 pm
Forum: Graphics, sound and multimedia
Topic: Can't play converted mp4 from Pi on VLC (Win7)
Replies: 1
Views: 511

Re: Can't play converted mp4 from Pi on VLC (Win7)

How are you converting to mp4?
by MattHawkinsUK
Sun Feb 09, 2014 10:52 pm
Forum: Beginners
Topic: SD-card is it really risky business?
Replies: 10
Views: 3098

Re: SD-card is it really risky business?

Never had an SD card or USB stick failure. I've had a Pi running for 24/7 for 2 years with a few reboots in between.

I wouldn't worry about wearing out an SD card. For most people it will out live most of their projects.
by MattHawkinsUK
Wed Jan 29, 2014 3:10 pm
Forum: Advanced users
Topic: LCD backlight control
Replies: 5
Views: 3581

Re: LCD backlight control

That's correct. The trimming resistor doesn't really have 0V,5V or input/output pins. But is this circuit you just use one end and the middle pin. It doesn't matter which two pins you use on the trimming pot as long as one of them is the middle. If you used the outer pins you would just have a fixed...
by MattHawkinsUK
Fri Jan 24, 2014 12:03 am
Forum: General discussion
Topic: Ebay PI issue newbie
Replies: 2
Views: 617

Re: Ebay PI issue newbie

You've got a lot of variables there! I would download Raspbian and create a fresh SD card. You can't really trust pre-loaded SD cards as there are plenty of old. badly imaged cards out there. You never really know what you are using. Use a standard USB mouse and keyboard. Forget WiFi and fancy bluet...
by MattHawkinsUK
Thu Jan 23, 2014 11:51 pm
Forum: General discussion
Topic: Original 256Mb Pi - Collectors Item?
Replies: 16
Views: 2447

Re: Original 256Mb Pi - Collectors Item?

Yes they will have a future value but like most antiques they will have to become rare first ... which means the Pi will need to be out of production by quite a few decades. I would just use it. Otherwise you will have to store it for 40 years. Technology is going to present certain challenges to co...
by MattHawkinsUK
Thu Dec 26, 2013 9:11 pm
Forum: Beginners
Topic: Error in Quick Start Guide?
Replies: 10
Views: 1417

Re: Error in Quick Start Guide?

The instructions tell you to extract first and then copy to the card. nolly53 is saying that this didn't work and the Zip file needed to be unzipped directly to the SD card. This implies the SD card ends up with a different set of files depending on the unzip method you use. If there are any files i...
by MattHawkinsUK
Thu Dec 26, 2013 12:09 am
Forum: Raspbian
Topic: easiest way for download a file from raspbian
Replies: 3
Views: 769

Re: easiest way for download a file from raspbian

For file transfers from my Pi to Windows I use WinSCP. Recently I've tried MobaXterm. Fairly quick and easy to setup.
by MattHawkinsUK
Wed Dec 18, 2013 12:21 pm
Forum: Off topic discussion
Topic: What watch brand is better?
Replies: 18
Views: 3966

Re: What watch brand is better?

Can't beat a 1985 Casio DBC-600.
by MattHawkinsUK
Sun Dec 15, 2013 10:17 pm
Forum: Troubleshooting
Topic: Cannot Reflash SD card
Replies: 10
Views: 1832

Re: Cannot Reflash SD card

I always use the SD Formatter from :
https://www.sdcard.org/downloads/formatter_4/

Just remember to set the Resize option. It will then restore the full capacity of the card so you can reimage.
by MattHawkinsUK
Sun Dec 15, 2013 9:06 pm
Forum: Beginners
Topic: First experience - horrible
Replies: 48
Views: 6965

Re: First experience - horrible

Just use the standard Raspbian image. Never had a problem with composite or HDMI. It just works. NOOBS seems more confusing in some respects.

A laptop has plenty of advantages over a Pi ... But equally as many disadvantages.
by MattHawkinsUK
Fri Dec 13, 2013 11:01 pm
Forum: Beginners
Topic: EDIMAX EW-7811Un don't work
Replies: 2
Views: 610

Re: EDIMAX EW-7811Un don't work

1) Download Raspbian image from Official download page.

2) Write to SD card

2) Run startx and use the WiFi config utility.
by MattHawkinsUK
Sat Dec 07, 2013 9:40 pm
Forum: General discussion
Topic: RaspBerry Pi(e) Model C (imaginations & wants)
Replies: 431
Views: 150922

Re: RaspBerry Pi(e) Model C (imaginations & wants)

The idea of putting the Pi inside a keyboard is a good one (C64, ZX81 etc) but one of the concepts behind the Pi was that kids could actually see it. They didn't want it hidden in a box otherwise it would just become another box of electronics. Kids can put their Pi in a case, but they get to choose...
by MattHawkinsUK
Sat Dec 07, 2013 9:30 pm
Forum: Beginners
Topic: Running minecraft
Replies: 8
Views: 1758

Re: Running minecraft

Are you trying this from within LXDE? ie running startx ?

Minecraft can't be run directly from the command prompt unless you are doing it from a terminal window within LXDE.

Take a look at my instructions here:
http://www.raspberrypi-spy.co.uk/2013/1 ... pberry-pi/
by MattHawkinsUK
Fri Dec 06, 2013 10:54 pm
Forum: HATs and other add-ons
Topic: RTC
Replies: 34
Views: 27619

Re: RTC

I'll have to take another look. I tried the setup program but it threw an error about not recognising the m48 device.

I think the confusion is that if you follow the user manual you end up with a different avrdude setup compared to the web page.
by MattHawkinsUK
Thu Dec 05, 2013 7:39 pm
Forum: HATs and other add-ons
Topic: RTC
Replies: 34
Views: 27619

Re: RTC

I'm also getting :

Code: Select all

hwclock: Cannot access the Hardware Clock via any known method.
hwclock: Use the --debug option to see the details of our search for an access method.
If I run "sudo i2cdetect -y 1" I get "68 69" in the grid so I assume I must be close?

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