Go to advanced search

by johndough
Thu Apr 16, 2015 7:21 am
Forum: General discussion
Topic: power, automated, blind control
Replies: 3
Views: 3467

Re: power, automated, blind control

I would like to put power, pi controlled, blinds in my windows in my house. I've prototyped the UI piece but I'm not really where to go from here. I need to control something like a garage door opener (10 of them actually), anyone point me in a direction? I'm prepared to build and mount motors for ...
by johndough
Tue Apr 07, 2015 10:36 am
Forum: Automation, sensing and robotics
Topic: home automation
Replies: 8
Views: 2875

Re: home automation

ame wrote:Disconnect the lights from the switches.

Connect the lights to the relays.

Connect the switches to the Pi.
Hi

I would leave some local control, bedside switch and bathroom. Also there is the question of a stairway should the Pi shutdown for any reason, and having a light to guide you.
by johndough
Sun Apr 05, 2015 9:47 am
Forum: Automation, sensing and robotics
Topic: home automation
Replies: 8
Views: 2875

Re: home automation

Hi

I think this is relevant...

Mains Electricity will kill, it is lethal.
LightingMulti.PNG
LightingMulti.PNG (58.94 KiB) Viewed 2123 times

You would need to create either the 2 way version or the 3way/Intermediate.

The 2way requires a changeover contact, the Intermediate needs 2 C/O contacts.
by johndough
Tue Mar 31, 2015 8:59 am
Forum: General discussion
Topic: Controlling some linear actuators?
Replies: 4
Views: 2472

Re: Controlling some linear actuators?

Thanks, I sketched it out & realized my error on the number of relays required. The linear actuators have integrated limit switches, so they take care of that issue themselves. I only need to apply positive & negative or negative & positive to the only 2 wires coming out of the actuators. My plan w...
by johndough
Mon Mar 30, 2015 7:52 am
Forum: General discussion
Topic: Controlling some linear actuators?
Replies: 4
Views: 2472

Re: Controlling some linear actuators?

Hi As said 2 relays per actuator, and 2 GPIO. Also the built in limit control may be a Reed Switch and wont be suitable for switching the relays, and therefore will require 2 GPIO. So that is 4 GPIO per actuator. In the software you could try a run timer as a backup, so the output only runs for X se...
by johndough
Fri Jan 09, 2015 11:45 am
Forum: Beginners
Topic: Poor man's UPS
Replies: 8
Views: 1445

Re: Poor man's UPS

Hi As 'scooter' batteries were mentioned as a possible source then I think ripple is worth mentioning. Damaging the batteries seems to defeat the object of keeping costs down, if they would be expected to be used annually then either a float or top-up would be wanted. ############## A ripple voltage...
by johndough
Fri Jan 09, 2015 11:31 am
Forum: Automation, sensing and robotics
Topic: Home automation
Replies: 20
Views: 3635

Re: Home automation

Hi I have used telerupteurs, from Relee Finder, with a radio for garage door opening. Therefore if you add the teleruptuers to your system then a single pole relay, N/O will suffice. The Pi connection needs to be only momentary. A Finder 26.02, 04, 06, 08 will work nicely when added to a mechanicall...
by johndough
Wed Jan 07, 2015 11:42 am
Forum: Beginners
Topic: Poor man's UPS
Replies: 8
Views: 1445

Re: Poor man's UPS

Hi I took a quick look at narrow boats and their batteries and solar panels and the wind generators. Some of the details may be relevant, especially battery life. http://livingonanarrowboat.co.uk/living-on-a-narrowboat-articles/narrowboat-electrics-part-1-batteries/ If the supply is intermittent, wo...
by johndough
Wed Jan 07, 2015 11:16 am
Forum: Automation, sensing and robotics
Topic: Home automation
Replies: 20
Views: 3635

Re: Home automation

Hi To control a bedroom light... Normally there is a switch on the wall, perhaps one by the bed as well. You cannot just add a Pi into that circuit. You either put the relay centrally and run the bedroom mains/switch wiring back to the centre, or put the relay locally and run the Pi command wires to...
by johndough
Tue Jan 06, 2015 10:05 am
Forum: Automation, sensing and robotics
Topic: Home automation
Replies: 20
Views: 3635

Re: Home automation

Hi Nothing wrong with that relais board at all. Please dont assume your project is going to work using that board because it wont. Earlier you were given advice on running cables, POE etc etc; it was good advice and should be heeded. If you connect that board to your Pi and Program it the 8 relays w...
by johndough
Tue Jan 06, 2015 9:29 am
Forum: Automation, sensing and robotics
Topic: How to know the state of a switch connected to mains
Replies: 12
Views: 2080

Re: How to know the state of a switch connected to mains

Hi

#######################################
Hiya

MAINS ELECTRICITY IS LETHAL.

Maybe something here that could help...

viewtopic.php?f=37&t=76230&p=544917#p544917

If in doubt please ask.

##################################

LightingMulti.PNG
If in doubt please ask.
LightingMulti.PNG (58.94 KiB) Viewed 1894 times
by johndough
Mon Jan 05, 2015 4:17 pm
Forum: Automation, sensing and robotics
Topic: Home automation
Replies: 20
Views: 3635

Re: Home automation

Hi Latching relays are available in differing concepts... Relais Finder do latching (stepping )relays, Telemecanique do a totally different latching relay and of course a relay can latch (self hold) itself. http://www.finder-relais.net/en/products-residential-commercial-installation.html http://www2...
by johndough
Tue Dec 30, 2014 8:08 pm
Forum: Beginners
Topic: Electrical Newbie. Cap+resist+relay.
Replies: 14
Views: 1613

Re: Electrical Newbie. Cap+resist+relay.

Hi I do get it. Perhaps you do not... >> The problem is that I need to keep the power to the micro USB port on long enough to run the shutdown script << so says the OP. Therefore it is the Pi that needs 15 seconds of power after removal of the supply. Hence the Capacitor, yes it could be rechargeabl...
by johndough
Mon Dec 29, 2014 10:22 am
Forum: Beginners
Topic: Electrical Newbie. Cap+resist+relay.
Replies: 14
Views: 1613

Re: Electrical Newbie. Cap+resist+relay.

Hi The circuit I suggested is to hold up the Pi for long enough to shut down after removal of the mains supply, like a BBU would. If the capacitor is put after the relay and a diode used to prevent the capacitor holding in the relay, only the Pi gets powered from the capacitor. So a power loss, eith...
by johndough
Sun Dec 28, 2014 10:58 am
Forum: Beginners
Topic: Electrical Newbie. Cap+resist+relay.
Replies: 14
Views: 1613

Re: Electrical Newbie. Cap+resist+relay.

johndough- Your saying to use the wall power to open and close the relay, but have the cap on one end of the relay to keep feeding power to the Pi? Hi Well here is something to start you off with another set of questions... Scripted ShutDown.PNG A suitable relay is available from CPC Farnell and IM...
by johndough
Sat Dec 27, 2014 11:12 am
Forum: Beginners
Topic: Electrical Newbie. Cap+resist+relay.
Replies: 14
Views: 1613

Re: Electrical Newbie. Cap+resist+relay.

Hi First of all I would get a relay that is / has a 5 VDC coil, or a solid state version. See CPC Farnell SW02549 http://imopc01.imostatic.net/technical/srrhn.pdf SRRHN-2CN-SL-5VDC preferably 2 pole Normally open or Changeover. ############################################# Then I would get it to ene...
by johndough
Mon Dec 22, 2014 12:23 pm
Forum: Android
Topic: just a couple of last questions.
Replies: 30
Views: 4079

Re: just a couple of last questions.

rpdom wrote:If/when a revamp gets underway, I'd like to second the option of having an "ignore these fora" in the view new or unread posts pages.
Hi

I have a dinner plate, that when salad is applied "I ignore those flora" and I aint even Scottish, arf arf.
by johndough
Mon Dec 22, 2014 12:20 pm
Forum: Off topic discussion
Topic: YOU SUCK: the venting thread
Replies: 948
Views: 150532

Re: YOU SUCK: the venting thread

noob wrote:[vent]whats the goddamn benefit of ipads opposed to books anyway? [/vent]
A broken iPad makes a better chopping board than a broken book.
by johndough
Mon Dec 22, 2014 12:12 pm
Forum: Java
Topic: 9-bit Serial by way of parity bit
Replies: 8
Views: 6732

Re: 9-bit Serial by way of parity bit

Hi I know nothing about anything, however I had a look around and found... http://digital.ni.com/public.nsf/allkb/3BDC7FF03541F772862564990057F919 a snippet... 1. Use the parity bit as a 9th data bit: Transmission: You will need to set the port up for 8 data bits. To add a ninth bit to your transmis...
by johndough
Tue Dec 09, 2014 9:24 am
Forum: Other projects
Topic: RasPi Car
Replies: 21
Views: 49550

Re: iCarus - Raspberry Pi Car PC kit

It is available on http://i-carus.com Hi Interesting. iCarus Super Kit $400 iCarus Basic Kit $350 iCarus Mini Kit $250 iCarus Super Kit 1 $399 $399 iCarus Basic Kit 1 $380 $380 iCarus Mini Kit 1 $290 $290 The checkout costs don't match the previous screen costs. So with shipping and taxes the costs...
by johndough
Thu Dec 04, 2014 9:59 am
Forum: Automation, sensing and robotics
Topic: For the Wine Cellar: Concept Critique Please!
Replies: 10
Views: 4708

Re: For the Wine Cellar: Concept Critique Please!

Hi

perhaps a reed switch on the door(s)?
by johndough
Mon Dec 01, 2014 9:40 am
Forum: Off topic discussion
Topic: UK Wall Socket with built in 2 x USB
Replies: 24
Views: 3782

Re: UK Wall Socket with built in 2 x USB

Hi

Try Screwfix for some details of a similar product...

http://www.screwfix.com/p/lap-13a-2-gan ... late/14309

Possibly Greek in origin, but ASTA certified.
by johndough
Tue Nov 18, 2014 9:59 am
Forum: Raspbian
Topic: Creation of SD card using Apple OS X
Replies: 7
Views: 3705

Re: Creation of SD card using Apple OS X

Hi

Using linux I found...

Did find that

xzcat [image].raw.xz | dd bs=4M of=/dev/sdX; sync

seemed to prefer the line below

xzcat [image].raw.xz | dd bs=4MB of=/dev/sde; sync


the 4M needed to be 4MB.
by johndough
Sat Nov 15, 2014 11:17 am
Forum: Beginners
Topic: Getting started with home automation
Replies: 8
Views: 1588

Re: Getting started with home automation

Hi Somewhere I have posted how to build a 3 motor relay that would control 3 electric shutters, or window blinds awnings or 1 of each or similar. So if you have a commercially available motor, lets pretend its 230 volts and 230 watts, and has 4 wires coming out of it. The running current would be 1 ...
by johndough
Tue Nov 04, 2014 10:51 am
Forum: Beginners
Topic: Incorrect Disc Usage
Replies: 14
Views: 1632

Re: Incorrect Disc Usage

Its now so weird I can't even delete anything... Even if I open folder as root it won't let me now.... Hi I would put the SD card into my XP machine and use DiskInternals Linux Reader to examine and perhaps try a tidy up. linuxreader.PNG This is of a 4 gig SD card from an android phone apparently.

Go to advanced search