IR mains switch

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I didn't see anything that was an exact match for your requirements on a quick search but it might give you some ideas on what's available. Also, toys! ;-)

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Rich Webb     Norfolk, VA

On a sunny day (Tue, 06 Sep 2011 16:07:22 +0100) it happened Dirk Bruere at NeoPax wrote in :

The cheapest way I know and used, was to get some of those 'klik aan / uit' devices (translated: click on /off, 3 at the supermarket for about 20 Euro), and a 430 MHz transmitter and receiver module (I already had, from conrad.nl). I sampled a few seconds of demodulated output of their transmitter into a PC par port pin, and recorded it in a file as zero and ones (file y.dat for code X command Y). Then playing back by connecting the serial port RTS pin to the power of the 430 MHz module, that then switches the lights.. lsm info file:

source code:

RS23w RTS has enough power to power those transmitter modules.

If you cannot find 'klik aan /uit' I am sure those exists under an other name in the UK and elsewhere. The trick should work for any AM 430 MHz based control system including car keys^H^H^H^H^H^H^H^H^H^H^H^H^H. I dunno about andoid tables, I do not like java, you need an output pin that is for sure.

Mostly, people use X-10 (power line signal) for this kind of thing; there are X-10 radio 'bridge' units, and the right kind of IR remote control (X-10 model UR-24A is on the table here) will trigger them, because it has dual IR/RF output.

devices

par port pin,

430 MHz module,

in the UK and elsewhere.

keys^H^H^H^H^H^H^H^H^H^H^H^H^H.

is for sure.

One of the most obvious things that manufacturers should have done is put an IR xmitter on each tablet/smartphone as a IR remote control output. Does anyone know whether its possible?

--
Dirk

http://www.neopax.com/technomage/ - Magick and Technology

X10 is pretty flaky. We need something to switch power to multiple powered speakers located in different parts of a room on different sockets. Ideally what I would like is a single power socket that accepts instructions from IP over mains. Cheaply.

--
Dirk

http://www.neopax.com/technomage/ - Magick and Technology

Definitely possible; my Treo 600 (early smartphone) has the same IR port (actually, IRDA bidirectional) as other Palm PDAs, and supports the usual PalmOS applications that implement IR remote control.

Problem is that we are committed to Android

--
Dirk

http://www.neopax.com/technomage/ - Magick and Technology

If you have an always-on server, there are serial or USB bridges that will send the X10 signals, of course. It may be flaky, but it has always worked for me. I'm curious, you don't think of IP as flaky? Or infrared remote signalling?

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View using a fixed pitch font.

               TRANSMITTER 
.+----------------------------------+
.| [FI]--O                          |   [RX]--[DETECT F1]--[SW1]
.| [F2]--O [RX]--[DETECT F2]--[SW2]    
.| [F3]--O                          |   [RX]--[DETECT F3]--[SW3]
.+----------------------------------+

I have played with a bluetooth module for something similar. eg the RN41 modules from Roving Networks.

They are intended to be a serial line replacement, but also have an output line which simply signals whether the bluetooth connection is made. Since each device has a unique MAC address, its easy to attempt a connect with the address of each module. Then that one sets its connect status line high. Use this to switch a power circuit.

There are simple bluetooth apps for android which would allow to do this without much further coding.

--
Regards,

Adrian Jansen           adrianjansen at internode dot on dot net
Note reply address is invalid, convert address above to machine form.

Aren't all car key remotes using rolling codes these days? That trick shouldn't work on cars, garage doors or any other remote controlling access to valuables.

Jeroen Belleman

On a sunny day (Wed, 07 Sep 2011 08:15:07 +0200) it happened Jeroen Belleman wrote in :

It is called relay attack, and sometime ago a paper was published (sci.crypt), used the following system: Man leaves car, goes to restaurant.

Attacker, oh well

It is a step beyond the simple replay attack, but uses exactly the same hardware.

On a sunny day (Tue, 06 Sep 2011 22:31:44 +0100) it happened Dirk Bruere at NeoPax wrote in :

Can you flash the display backlight? Then you can use a photocell to drive the electronics.

I suspect the backlight is LED, so not much IR

--
Dirk

http://www.neopax.com/technomage/ - Magick and Technology

If IR is not truly required:

hamilton

On a sunny day (Wed, 07 Sep 2011 14:58:29 +0100) it happened Dirk Bruere at NeoPax wrote in :

I was thinking of putting the thing in a box with a normal photocell, or putting some sucking thing on it with a photocell, then process the normal light and re-transmit with an IR LED, or radio. Acoustic (modem) sort of sound would work too. Maybe it has a shitty small speaker that goes to above 20 kHz ? ;-)

at

:

re at

is

He need to run an apps (touch and view), so you can't just put it in a box. Most droids have USB (at least device, some with host). Can easily put in a IR dongle on the USB port.

On a sunny day (Wed, 7 Sep 2011 10:03:28 -0700 (PDT)) it happened linnix wrote in :

Ah USB! now yes, much easier, I actually have such a dongle for my old Alcatel cellphone. Was a bit of work to get it to work in Linux:

My script /usr/local/sbin/start-irda killall -KILL irattach modprobe irda-usb modprobe ircomm modprobe ircomm_tty modprobe irlan modprobe irnet ifconfig irda0 up irattach irda0 -s

# I use obexftp to grab pictures from teh phone: # list on camera: obexftp -l "User Data/Photo/Camera" # copy to PC obexftp -g "User Data/Photo/Camera/Cam000041.JPG

I did need to recompile a kernel for that.

Now for Androids I do not know, other then they should have used Linux.

re =3D

rue=3D

ne =3D

ol

IR

rts

catel cellphone.

Yes, they are. Kernel is Linux 2.6. Actually, the USB device stack is non-standard, since Linux come with host stack. However, most droids come with device stack for charging, software upgrades and maintenance. Droid host stack is non-standard. I guess standard is whoever got the most market share.