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by Mortimer
Fri Feb 09, 2018 4:57 pm
Forum: Beginners
Topic: mini usb leds
Replies: 17
Views: 3134

Re: mini usb leds

I would still buzz them out, it is not unknown for wires to be swapped in low cost Chinese sourced components.
by Mortimer
Thu Feb 08, 2018 11:45 pm
Forum: Beginners
Topic: raspbian jesse vs raspbian stretch
Replies: 8
Views: 31568

Re: raspbian jesse vs raspbian stretch

No, Stretch is the most recent, and therefore youngest... https://www.debian.org/releases/ The next release of Debian is codenamed buster — no release date has been set Debian 9 (stretch) — current stable release Debian 8 (jessie) — obsolete stable release Debian 7 (wheezy) — obsolete stable release...
by Mortimer
Sat Feb 03, 2018 7:49 am
Forum: Beginners
Topic: What is pi E9U6?
Replies: 6
Views: 1303

Re: What is pi E9U6?

My Google-foo led me to these: https://www.cooking-hacks.com/documentation/tutorials/gprs-gsm-quadband-module-arduino-raspberry-pi-tutorial-sim-900/ https://www.itead.cc/raspberry-pi-sim900-gsm-gprs-add-on-v1-0.html So firstly there seems to be guidance on how to use modules like or similar to the o...
by Mortimer
Sat Jan 27, 2018 8:47 am
Forum: Automation, sensing and robotics
Topic: electronics to controll four LED stripes individually
Replies: 3
Views: 751

Re: electronics to controll four LED stripes individually

There might be a problem using that board with 24V lamps. The board appears to require 12Vdc to drive the output stage and this is coupled with the + output connections. The optoisolator output stage may be tolerant to 24Vdc on the Vpp rail, but I would worry about the mosfet gate voltage being a li...
by Mortimer
Fri Jan 26, 2018 6:48 am
Forum: General discussion
Topic: Wireless firmware testers wanted
Replies: 81
Views: 25514

Re: Wireless firmware testers wanted

I use a RPi3 as a VNC client for an ESXi box. It didn't work reliable over wifi, so I through I would try this out. I am now getting "Turn Off Wifi - No APs found - scanning..." constantly in the menu bar. Reverted to the original firmware and that is doing the same. So I might have a diff...
by Mortimer
Tue Jan 16, 2018 11:32 am
Forum: General discussion
Topic: Eben Upton on BBC Radio 4 "The Life Scientific"
Replies: 26
Views: 5239

Re: Eben Upton on BBC Radio 4 "The Life Scientific"

Now he is a celeb', how long before we see him on 'Strictly'?
by Mortimer
Sun Jan 14, 2018 5:58 pm
Forum: General discussion
Topic: New EP music-album entirely on the Raspberry Pi
Replies: 7
Views: 1785

Re: New EP music-album entirely on the Raspberry Pi

Amazing and awesome.

I agree the RPi sound is surprisingly warm.

I would love to see a video about how you did this. What tools and techniques? What software? How long it took? etc...
by Mortimer
Wed Jan 10, 2018 5:43 pm
Forum: Python
Topic: HELP! , Relay module always on
Replies: 4
Views: 1842

Re: HELP! , Relay module always on

The product code you gave us relates to just the relay. What board is the relay on? Where does the board come from? Did any instruction or diagrams come with the board?
by Mortimer
Tue Jan 09, 2018 10:49 am
Forum: Beginners
Topic: mini usb leds
Replies: 17
Views: 3134

Re: mini usb leds

It looks like a solution to use a USB socket is being followed. In case there was any doubt however, the other thing to be careful of with USB powered devices, is that often the USB plug body is where electronics is hidden. It is unlikely in this case, although there might be a resistor or constant ...
by Mortimer
Wed Dec 20, 2017 2:28 pm
Forum: General discussion
Topic: 12V relay schematics
Replies: 25
Views: 6846

Re: 12V relay schematics

The schematic looks to me like the lock is wired to a normally closed (NC) contact. I.e. when the GPIO output is low, the circuit is closed and the lock is fed 12V and activates. If the RPi outputs a high on the GPIO then the relay should switch over and disconnect the 12V supply from the lock. Thin...
by Mortimer
Wed Dec 20, 2017 1:25 pm
Forum: General discussion
Topic: 12V relay schematics
Replies: 25
Views: 6846

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: 4099

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: 4099

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...
by Mortimer
Wed Dec 20, 2017 11:12 am
Forum: Off topic discussion
Topic: Cellular Connected Home Phone System
Replies: 5
Views: 4099

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: 6846

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: 6846

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: 3932

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: 2036

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: 13843

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: 4827

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: 3932

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: 4827

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: 4827

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: 19044

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: 1358

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.

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