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by recantha2
Sat May 30, 2020 10:14 am
Forum: General discussion
Topic: Strange wi-fi problem when swapping SD cards
Replies: 0
Views: 132

Strange wi-fi problem when swapping SD cards

Hi everyone. Hopefully, someone can help diagnose and fix this issue because it's driving me potty. My normal behaviour is to install Raspbian/RPiOS to an SD card, set-up wi-fi, update the OS and then develop software/my project on the Pi 4 or Pi 3 and then swap the SD card to a Zero W (because they...
by recantha2
Mon May 18, 2020 5:17 am
Forum: Automation, sensing and robotics
Topic: Bulding a automatic ROBOT
Replies: 1
Views: 88

Re: Bulding a automatic ROBOT

Hi jm.
Can I ask which parts you're struggling to find? Then I'll see if I can find a European supplier.

Thanks.
by recantha2
Sat May 16, 2020 6:37 pm
Forum: General discussion
Topic: New project: Remotely control wheels
Replies: 3
Views: 83

Re: New project: Remotely control wheels

You'll probably need to look at camera streaming, too. A version 1 or 2 camera (as opposed to the HQ camera just released) will probably do, just so you can see where you're going. :-)
by recantha2
Sat May 16, 2020 6:36 pm
Forum: General discussion
Topic: New project: Remotely control wheels
Replies: 3
Views: 83

Re: New project: Remotely control wheels

Hello, As with all things... "It depends". On a great many factors. You'll likely need to look at either stepper motors (which give you the exact control you're looking for) or DC motors with encoders (which give visual feedback on how far they've travelled). You'll need a driver board (or boards) t...
by recantha2
Wed May 06, 2020 12:20 pm
Forum: Automation, sensing and robotics
Topic: DRV8833 - 4WD?
Replies: 5
Views: 147

Re: DRV8833 - 4WD?

Yes, just splice the motor wires together and put them into the screw terminals. Shouldn't be a problem with the yellow motors :-)
by recantha2
Tue May 05, 2020 5:28 pm
Forum: Automation, sensing and robotics
Topic: DRV8833 - 4WD?
Replies: 5
Views: 147

Re: DRV8833 - 4WD?

Hi there.
I have seen the CamJam motor controller run 4 of the yellow motors. Not very fast, to be sure, but it can do it. I suspect it's at the limit of what it can do, though :-)
by recantha2
Fri May 01, 2020 7:42 am
Forum: Camera board
Topic: Raspberry Pi High Quality Camera
Replies: 149
Views: 8844

Re: Raspberry Pi High Quality Camera

I've taken some sample shots for my blog - https://www.recantha.co.uk/blog/?p=20060 Click the images to get the 6MB+ versions. They're... okay as shots... a bit dull (alright, I quite like the keyboard shot, but that's me). But they do show the quality. They were shot with the 16mm camera on a small...
by recantha2
Mon Apr 27, 2020 7:35 am
Forum: General discussion
Topic: i2c issue when combining grovepi with camjam edukit
Replies: 3
Views: 120

Re: i2c issue when combining grovepi with camjam edukit

Hi. Just checking... Have you got the EduKit board the right way up? It should have the double-row of female pins downwards. (You'd be surprised how many we've had plug the single row in, so just checking).
by recantha2
Fri Apr 17, 2020 5:53 am
Forum: General discussion
Topic: What are the best Robot kits on the market for beginners
Replies: 7
Views: 1865

Re: What are the best Robot kits on the market for beginners

Try the CamJam EduKit 3 - details here: https://camjam.me/EduKit

Kit is cheap, available from The Pi Hut and you can download the worksheets from the CamJam website.

Disclaimer: I helped develop and test the kit

Any problems or questions, contact me through that website :-)
by recantha2
Fri Apr 17, 2020 5:40 am
Forum: General discussion
Topic: Starting with electronics
Replies: 15
Views: 492

Re: Starting with electronics

Try the CamJam EduKits. They are cheap electronics kits that come with what you need plus well-written worksheets that you can download and print out if you like. https://CamJam.me/edukit Disclaimer: I helped develop and test the kit and worksheets. There are three kits: basics (up to traffic lights...
by recantha2
Thu Mar 05, 2020 9:22 am
Forum: Staffroom, classroom and projects
Topic: Search for speaker about building robots
Replies: 6
Views: 755

Re: Search for speaker about building robots

Hi Emma,
I'm one of the organisers of Pi Wars which was mentioned above. I've tweeted out about your enrichment day on the @PiWarsRobotics account and then retweeted it to my 6k followers. Hopefully you should get some responses :-)

When is the enrichment day?
by recantha2
Fri Feb 07, 2020 10:52 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi running on its own for ROBOT
Replies: 2
Views: 231

Re: Raspberry Pi running on its own for ROBOT

Hi. You want to lookup how to run a Raspberry Pi "headless". You'll need to enable SSH and configure wifi on the Pi so you can connect to it remotely. Previous poster is correct: you _will_ need power, but this can be achieved through, for example, a USB battery pack (there are other methods). How y...
by recantha2
Wed Sep 25, 2019 5:46 am
Forum: Automation, sensing and robotics
Topic: Smart pillow to detect Sleep Apnea utilizing RaspberryPi
Replies: 20
Views: 2347

Re: Smart pillow to detect Sleep Apnoea utilizing RaspberryPi

DougieLawson wrote:
Tue Sep 24, 2019 7:16 pm
Can you spell it the British way with the extra O or œ dipthong?

Apnoea or Apnœa (if you want to be very traditional).
If you like. On all my UK records, it says apnea, so I suspect the medical profession has given up trying to find the way to do it correctly :-)
by recantha2
Tue Sep 24, 2019 6:07 pm
Forum: Automation, sensing and robotics
Topic: Smart pillow to detect Sleep Apnea utilizing RaspberryPi
Replies: 20
Views: 2347

Re: Smart pillow to detect Sleep Apnea utilizing RaspberryPi

Another sleep apnea sufferer here. Disturbing someone with sleep problems to stop them snoring is just heaping misery on the person. If you must carry on, I suggest just recording instances of the snoring without any kind of buzzer. That way you've got something that can be taken to sleep specialist...
by recantha2
Sun Jul 14, 2019 11:16 am
Forum: General discussion
Topic: What's the simple and safe way to do a "shutdown" button?
Replies: 5
Views: 1083

Re: What's the simple and safe way to do a "shutdown" button?

Try this:
It's a tutorial I wrote a while back that lets you shutdown a Raspberry Pi with a paperclip shorting across the last two GPIO pins on the right (with the pins at the top left):
https://www.recantha.co.uk/blog/?p=13999

Just wire up a button if you don't want to use the paper clip :-)
by recantha2
Tue Jul 09, 2019 10:35 am
Forum: General discussion
Topic: Pi 4 + netbook or just get a pi-top?
Replies: 18
Views: 3894

Re: Pi 4 + netbook or just get a pi-top?

pi-top laptop v2 (which they've clumsily renamed pi-top[3] is not compatible with the Pi 4 - it just doesn't connect properly because of the change of HDMI port. However, pi-top[4] is on Kickstarter today at 4pm (BST) which looks like it has a screen/keyboard solution for the Pi.
by recantha2
Wed Apr 24, 2019 4:27 pm
Forum: General discussion
Topic: 3D printer and Raspberry Pi power control
Replies: 2
Views: 543

3D printer and Raspberry Pi power control

Hi all, Over on a Facebook group, we've been having a discussion about controlling power to a 3D printer and a Raspberry Pi from a common source. Rather than figure out some way of using a buck converter to power the Pi *from* the printer, my preferred solution is to do it from the mains in some way...
by recantha2
Mon Jan 14, 2019 4:16 pm
Forum: User groups and events
Topic: Pi Wars 2019 - 30th & 31st March - Cambridge, UK
Replies: 0
Views: 2033

Pi Wars 2019 - 30th & 31st March - Cambridge, UK

https://d2z6c3c3r6k4bx.cloudfront.net/uploads/event/logo/1073903/7844daec4d17b909f2986536aae917ed.jpg Spectator tickets for the 2019 Pi Wars competition are now available from the link on the Pi Wars website: https://piwars.org Pi Wars is an international, challenge-based robotics competition in wh...
by recantha2
Sat Jul 28, 2018 9:20 am
Forum: Automation, sensing and robotics
Topic: CamJam Edukit #3 Robotics
Replies: 6
Views: 1288

Re: CamJam Edukit #3 Robotics

Alternatively, you could go back to the place where you got the programming examples from (https://camjam.me/?page_id=1035#worksheets) - there are several examples of using both SSH and a PS3-alike controller on there.

--
Mike from CamJam
by recantha2
Fri Jul 20, 2018 11:02 am
Forum: General discussion
Topic: A new level of seasickness - Or how I learnt to stop worrying and love the new website
Replies: 66
Views: 7538

Re: A new level of seasickness

I was trying not to comment negatively when I saw the page initially, so I've had a think about it. Take this criticism for what it is: a design and implementation expert with a big interest in the Pi looking at it from his point of view. Firstly, Epoc's comment: The banner on top of page uses 2 pic...
by recantha2
Fri Jul 20, 2018 10:32 am
Forum: General discussion
Topic: We're looking at introducing more swag - what would you like to see?
Replies: 64
Views: 9524

Re: We're looking at introducing more swag - what would you like to see?

Hi Liz :-) +1 for baseball caps, lovely idea. Still love the current t-shirts with the big logo on the front - they're simple, they just work and one does get recognised as a fan on an alarming basis! Still quite like the idea of cufflinks, but that's a little niche for the tooling required. Water b...
by recantha2
Fri Jul 06, 2018 12:24 pm
Forum: General discussion
Topic: Raspi with Case and display - what can you recommend ?
Replies: 2
Views: 415

Re: Raspi with Case and display - what can you recommend ?

Hi there. If you just want a display and a case, I can suggest: https://thepihut.com/collections/raspberry-pi-cases/products/raspberry-pi-official-7-touchscreen-case for the case and then get an official touchscreen display: https://www.modmypi.com/pis-and-peripherals-1139/raspberry-pi-7-touchscreen...
by recantha2
Wed Apr 11, 2018 4:42 pm
Forum: Automation, sensing and robotics
Topic: Robot Navigation - Mapping or Map Reading
Replies: 5
Views: 1659

Re: Robot Navigation - Mapping or Map Reading

Hi. I'm one of the Pi Wars organisers. We do indeed reveal the design of the maze in advance. There's several ways of completing it: 1/ Ultrasonics on multiple sides of the robot to detect the walls. 2/ Pre-encoding the robot with a route with distances and angles. 3/ Add up to 6 'targets' such as Q...
by recantha2
Tue Mar 27, 2018 10:22 am
Forum: User groups and events
Topic: Pi Wars - 21st & 22nd April - Cambridge
Replies: 0
Views: 7004

Pi Wars - 21st & 22nd April - Cambridge

https://d2z6c3c3r6k4bx.cloudfront.net/uploads/event/banner/1055169/ea0006d98f1c42c772eb6ea81734f05a.jpg The fourth Raspberry Pi-powered robotics challenge competition is taking place on 21st and 22nd April at the Cambridge Computer Laboratory. Spectator tickets are still available! Come and see rob...
by recantha2
Wed Mar 14, 2018 10:01 am
Forum: General discussion
Topic: New Raspberry Pi model 3B+ 1.4 GHz, 330Mbit Ethernet, 802.11ac, PoE
Replies: 376
Views: 83210

Re: New Raspberry Pi model 3B+ 1.4 GHz, 330Mbit Ethernet, 802.11ac, PoE

Depends which case. Official Raspberry Pi case fits perfectly. PiBow doesn't, however, and they've launched a new version.

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