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by Mortimer
Wed Dec 20, 2017 1:25 pm
Forum: General discussion
Topic: 12V relay schematics
Replies: 25
Views: 4323

Re: 12V relay schematics

Are you using a magnetic lock something like this: https://www.robotshop.com/media/catalog/product/cache/15/image/900x900/9df78eab33525d08d6e5fb8d27136e95/m/a/magnetic-door-lock_2.jpg Or a solenoid released lock: https://ae01.alicdn.com/kf/HTB1Ly0MIpXXXXXkXXXXq6xXFXXXl/Security-home-electric-door-lo...
by Mortimer
Wed Dec 20, 2017 1:04 pm
Forum: Off topic discussion
Topic: Cellular Connected Home Phone System
Replies: 5
Views: 3406

Re: Cellular Connected Home Phone System

Thanks for the pointer on the Ligo Bluewave DrGeoff, that also looks like a useful alternative. Not sure about the Panasonic option though. I suspect the handsets will have the same problem her current mobile phone does. Small buttons, that don't look very tactile, small screen. She simply wouldn't ...
by Mortimer
Wed Dec 20, 2017 12:52 pm
Forum: Off topic discussion
Topic: Cellular Connected Home Phone System
Replies: 5
Views: 3406

Re: Cellular Connected Home Phone System

After having a further rummage around the interwebs I have come across desktop GSM phones like this one: https://images-na.ssl-images-amazon.com/images/I/51nXcP1jOPL._SL1000_.jpg https://www.amazon.co.uk/F610-DESKTOP-TELEPHONE-CELLULAR-TERMINAL/dp/B071R6D2HP/ref=pd_sbs_107_3?_encoding=UTF8&psc=1&ref...
by Mortimer
Wed Dec 20, 2017 11:12 am
Forum: Off topic discussion
Topic: Cellular Connected Home Phone System
Replies: 5
Views: 3406

Cellular Connected Home Phone System

I am trying to find something cost effective to help my Grandmother. Sadly she has had to move into a care home after living in her own home until just before her 94th birthday. She tried to get a landline put into her room at the home, but it was going to be too expensive. She has a mobile phone, b...
by Mortimer
Wed Dec 20, 2017 9:38 am
Forum: General discussion
Topic: 12V relay schematics
Replies: 25
Views: 4323

Re: 12V relay schematics

I may be the existing PSU has sufficient surge capacity to initially throw the lock using energy stored in smoothing capacitors, but insufficient to hold the lock continuously. I don't know, without knowing the spec of the lock.
by Mortimer
Tue Dec 19, 2017 9:56 pm
Forum: General discussion
Topic: 12V relay schematics
Replies: 25
Views: 4323

Re: 12V relay schematics

What lock is it?
I be surprised if 12V 1A supply is sufficient to operate it.
by Mortimer
Mon Dec 18, 2017 1:23 pm
Forum: Troubleshooting
Topic: SSH Connection breaking after some time
Replies: 6
Views: 1826

Re: SSH Connection breaking after some time

Is the Pi hanging or overloaded?

If the USB becomes too busy, then network connectivity can be lost, as it too relies on USB.
by Mortimer
Mon Dec 18, 2017 1:18 pm
Forum: Troubleshooting
Topic: [Resolved] Do I need more power?
Replies: 10
Views: 1127

Re: Do I need more power?

As Burngate suggests, some cheaper PSUs can be marketed with slightly distorted specifications. Sure it may be 5V output, and capable of delivering 3.5A, but not necessarily at the same time. It is not uncommon for the output Voltage to drop quite significantly as the output current nears the rated ...
by Mortimer
Mon Dec 18, 2017 12:52 pm
Forum: Beginners
Topic: Controlling electric roller blinds
Replies: 9
Views: 6884

Re: Controlling electric roller blinds

If the roller blind has a piece of axle you can get to and attach a piece of threaded rod. Put a nut on the threaded rod which is attached to the slider of a linear potentiometer. As the blind is wound up and down the nut will be driven in or out on the thread and cause a change in the potentiometer...
by Mortimer
Mon Dec 18, 2017 12:12 pm
Forum: Troubleshooting
Topic: HDMI to DVI Not Working
Replies: 11
Views: 3078

Re: HDMI to DVI Not Working

The OP has: HDMI -> DVI-D (cable) DVI-D ->VGA (active adapter) VGA -> VGA (cable) It is basically working, but is stuck at 720p. It sounds to me all he needs is guidance on getting the Pi to output 1920x1200, not a new device. His HDMI -> DVI-D -> VGA setup is basically the same as the device you're...
by Mortimer
Mon Dec 18, 2017 11:32 am
Forum: Troubleshooting
Topic: SSH Connection breaking after some time
Replies: 6
Views: 1826

Re: SSH Connection breaking after some time

SSH session timeout?
Does your client send keep-alive packets?
by Mortimer
Mon Dec 18, 2017 11:25 am
Forum: Troubleshooting
Topic: HDMI to DVI Not Working
Replies: 11
Views: 3078

Re: HDMI to DVI Not Working

Disagree, the HDMI-DVI lead is not an active adapter, its just wires inside. His Startech adapter is going to be pretty much the same as the device you're suggesting, it just has a different plug on the end.
by Mortimer
Mon Dec 18, 2017 10:28 am
Forum: Troubleshooting
Topic: HDMI to DVI Not Working
Replies: 11
Views: 3078

Re: HDMI to DVI Not Working

No sure that would help the OP fruitoftheloom. His setup is working just not at the resolution he wants, so I suspect a config issue.
by Mortimer
Sat Dec 16, 2017 2:00 pm
Forum: General discussion
Topic: X11 forwarding to a mac window
Replies: 13
Views: 16753

Re: X11 forwarding to a mac window

Holy thread resurrection Batman!! :lol:
by Mortimer
Tue Dec 12, 2017 11:22 pm
Forum: Troubleshooting
Topic: How big is Rasbian supposed to be?
Replies: 7
Views: 818

Re: How big is Rasbian supposed to be?

I've seen silly expanded sizes when the download hasn't completed successfully. I maybe the OP just needs to download again.
by Mortimer
Tue Nov 28, 2017 3:43 pm
Forum: General discussion
Topic: What to do with 4 old sata drives?
Replies: 29
Views: 4605

Re: What to do with 4 old sata drives?

For a while I was doing in-service support and regularly visited a Naval training establishment in the UK. In a corridor between classrooms there was glass cabinet inside of which was the guts of a PC spread out inside. This included the hard drive with cover removed. This was always operating when ...
by Mortimer
Tue Nov 28, 2017 6:43 am
Forum: General discussion
Topic: What to do with 4 old sata drives?
Replies: 29
Views: 4605

Re: What to do with 4 old sata drives?

Imperf3kt wrote:
Tue Nov 28, 2017 12:45 am
Its not just dust though. A lot of HDDs now include some kind of inert gas such as helium. Open it up and bye bye helium.
Not back then I don't think.
by Mortimer
Tue Nov 28, 2017 6:38 am
Forum: General discussion
Topic: What to do with 4 old sata drives?
Replies: 29
Views: 4605

Re: What to do with 4 old sata drives?

The message was, keep this drive in a clean place. I'm amazed you had things working at a time these spacings were 10, or more, times less. So were we frankly, especially when you consider that the reason the drive wasn't working was because the metal cover was touching the platter and stopping it ...
by Mortimer
Mon Nov 27, 2017 10:58 pm
Forum: General discussion
Topic: What to do with 4 old sata drives?
Replies: 29
Views: 4605

Re: What to do with 4 old sata drives?

Be aware that once you open them, you can never put them back together. HDDs are manufactured in a dust free environment, such as a vacuum. Only do this if you are sure you don't want the drive. 80GB is still useful! Many moons ago, a work laptop had a hard drive problem. It was a 2.5" IDE drive, c...
by Mortimer
Fri Oct 20, 2017 12:12 pm
Forum: Troubleshooting
Topic: Weird relay behaviour: always on if GPIO is set to OUTPUT, kinda turns off if GPIO is set to INPUT
Replies: 15
Views: 4003

Re: Weird relay behaviour: always on if GPIO is set to OUTPUT, kinda turns off if GPIO is set to INPUT

The input to the relay board is not active-low by any chance?

Did you try setting GPIO output pin to "1" to see if it turns off?
by Mortimer
Wed Sep 27, 2017 11:08 am
Forum: General discussion
Topic: What category does the RPi fall into?
Replies: 9
Views: 5234

Re: What category does the RPi fall into?

Their own FAQ says it is a computer : https://www.raspberrypi.org/help/faqs/#introWhatIs

So your "microcomputer" would be correct.
by Mortimer
Fri Aug 18, 2017 9:19 am
Forum: General discussion
Topic: Raspbian Stretch (9.1) has arrived !!
Replies: 129
Views: 35577

Re: Raspbian Stretch (9.1) has arrived !!

Thanks RaTTuS. I thought that might have been the case, but wanted to check because the original text had the ignore errors after the dist-upgrade, so I wasn't sure whether or not to expect errors and ignore them after the update step.
by Mortimer
Thu Aug 17, 2017 6:31 pm
Forum: General discussion
Topic: Raspbian Stretch (9.1) has arrived !!
Replies: 129
Views: 35577

Re: Raspbian Stretch has arrived !!

can you upgrade from jessie to stretch ... yes though it would probably be quicker to download and start again however sudo apt-get update && sudo apt-get dist-upgrade -y reboot then edit /etc/apt/sources.list /etc/apt/sources.list.d/raspi.list and change jessie to stretch then sudo apt-get update ...
by Mortimer
Tue Aug 08, 2017 9:20 am
Forum: General discussion
Topic: Account deletion?
Replies: 89
Views: 11496

Re: Account deletion?

It would only need to be 'honoured' if the requested is for removal data that comes into the legal definition of "personal data". Even then I would have thought that obfuscation of the account identity to become some sort of inactive, generic account, whilst retaining the posts would be sufficient i...

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