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1  Using Arduino / LEDs and Multiplexing / Re: RGB Led strips? on: August 13, 2013, 07:03:18 am

Try to have a look at the WS2811 LED strips being sold on eBay. like this example.
They can be controlled individually, and only require 5V. (be sure to check out the required voltage. I read about someone getting a 12V version instead).

For controlling the WS2811, check out this blog:
2  Topics / Home Automation and Networked Objects / Re: Arduino + Raspberry Pi Thermostat and Zone Control -- Need Guidance on: April 25, 2013, 07:15:38 am
Sounds interesting.

I am also thinking about creating something like your setup in my house.

3) What is the best way to do R-Pi <-> Arduino Communication (uART,Serial, RS-485, IP, etc)
For my project I was thinking UART, as it is easy to expand by simply dropping in some xbee modules.
They will directly accept UART communication, making the arduino sub-stations wireless.

! ! ! Please be aware that the RasPi is a 3,3v device, and (depending on the version) the arduino is a 5v device. before you connect the 2, you MUST use a level converter, or you risk frying the PI's IO ! ! !

I found some inspiration here:
that I'm trying to recreate.
So far i managed to get commands sent from the PI's web interface to the arduino using UART, and also using UART+Xbee.

I am nowhere near a working solution yet, so its great seeing others wanting to create something similar
3  Using Arduino / Networking, Protocols, and Devices / Re: How to send negative numbers over SPI on: December 14, 2012, 08:23:35 am
I agree with PaulS - difficult to help when there's no code!

A workaround the problem could be to add 100 before sending, so the values would be shifted to 39 - 161, and then on the receiving end, subtract 100 to get back to the actual values.

But I suspect there might be a more elegant solution than my kludgy approach above!  smiley-fat
4  Topics / Home Automation and Networked Objects / Re: KSduino on: December 10, 2012, 06:48:22 am
Looks really interesting.

Is there any rate limit for this service?
Looking at the data in some of the public views, shows updated data at least every second, which is very fast for an online service.

Will try it out as soon as I have a chance!  smiley
5  Topics / Home Automation and Networked Objects / Re: A little lost... on: September 17, 2012, 02:23:32 am
Thanks zoomkat. Didn't know about the F() command - will help me in future projects. Thanks!   smiley-lol
6  Topics / Home Automation and Networked Objects / Re: Wifi Web Thermostat on: September 13, 2012, 08:00:51 am
Looks like a nice and tidy user interface. smiley

I also used a modified OneWire library because the original one doesn't work with long wires (about 10 meters from arduino to temperature sensors).

One question>> What modifications did you do to the OneWire library?

I am asking, because I also plan to build some temperature monitoring on my heating system in the house, which is also heated by a pellet stove smiley

7  Topics / Home Automation and Networked Objects / Re: Functiodomo - New open and wireless home automation system based in Arduino on: August 03, 2012, 03:02:10 am
P.D.: Anyone knows how to scale the images shown in the forum. As you can see, I do not know but I would like to know it  smiley-eek

I have occasionally used for sharing pictures in forums. It will generate thumbnails of all the pictures, clicking the thumbnail will open the original picture.
8  Topics / Home Automation and Networked Objects / Re: Functiodomo - New open and wireless home automation system based in Arduino on: August 02, 2012, 08:31:48 am
Hi Jose.

Thanks for your reply.

I will be looking forward to try out your system smiley

Will it be possible to run the server as a virtual machine? -if so; it would make it really easy for you to create a master setup, and let people download it as an image or as a fully functioning VM.
9  Topics / Home Automation and Networked Objects / Re: Functiodomo - New open and wireless home automation system based in Arduino on: August 02, 2012, 01:46:01 am
Looks like an interesting project.  smiley-lol

3 questions:
  • I could not see from the demo page, if there is datalogging options, and options for creating graphs with historical and realtime data?
  • Will the functiodomo boxes be opensource; will I be able to create a node myself, using an arduino etc. -and make it talk to the functiodomo server?
  • Is there an alarming / messaging module for the server, so it can send out notifications and/or alarms in case something unwanted happens (heating system fault, low temperature, etc...)

10  Topics / Home Automation and Networked Objects / Re: home thermostate on: June 29, 2012, 04:45:43 am
draythomp>> looks like a nice project.
It looks like you have Pachube integration directly from the arduino as well, is that correct?
11  Topics / Home Automation and Networked Objects / Re: Arduino POE Ethernet (doorbell>iPhone) on: May 15, 2012, 07:00:26 am
Hi Lee, and welcome to this excellent forum.  smiley

My first thought would be to check the pull-down resistor. What value do you use?

Also; When you use an arduino pin as a digital input, it is possible to make use of the internal pull-up resistors in the chip.
-So when you use an external pull-down resistor, you should verify that the internal pull-up is disabled.

Here is the reference link, describing the internal pull-up resistors:

If you have a multimeter, try to measure the input pin on the arduino (pin 7 in your project):
  • when the doorbell is pressed
  • when the doorbell is not pressed

What are the voltages?
12  Topics / Home Automation and Networked Objects / Re: Question about the Arduino Ethernet with PoE module on: April 16, 2012, 06:55:30 am
The free version of Thingspeak has a limitation of maximum one post (logging) per 15 seconds per channel.
Each channel can contain up to 8 fields.
Currently, you can only show 1 field (plot) in each chart (would be nice if it was possible to show eg. indoor and outdoor temperature in the same chart).

Have a look here for examples and tutorials:

Direct link to GitHub with the current arduino example:

Link to my test channel, containing outdoor temperature readings:
13  Topics / Home Automation and Networked Objects / Re: Question about the Arduino Ethernet with PoE module on: April 16, 2012, 05:55:35 am
...will a graph be draw by Pachube API and be refreshed on the site?

Short answer: Yes  smiley

Although I have never personally used Pachube.

From my experience with ThingSpeak, it works flawlessly, and I imagine that it is equally easy with Pachube.
14  Using Arduino / Audio / Re: Error in running Tone tutorial on: April 05, 2012, 04:25:58 am
got it! it didn't like the name i gave it - "tone". i gave it a new name and all is swell.

Thanks for the feedback.   smiley-lol

I have just been experiencing the exact same problem with my project.
I was (still am) upgrading a project from Arduino 0018 to Arduino 1.0
Besides a lot of old references to NewSoftSerial, Wprogram.h, print function where the BYTE switch has been removed, etc. I ran into this weird error.

The error message here looks like this:
main.cpp.o: In function `main':
C:\Program Files\arduino-1.0\hardware\arduino\cores\arduino/main.cpp:11: undefined reference to `setup'
C:\Program Files\arduino-1.0\hardware\arduino\cores\arduino/main.cpp:14: undefined reference to `loop'

It turns out that you cannot name your project 'Main' or 'main' - It just won't compile.

Renaming it to 'kjsgyilisj'  (random fist on the keyboard!!  smiley-eek-blue  )  -and the code compiles just fine

Sometimes... i get very very tired!!!   smiley-confuse
15  Topics / Home Automation and Networked Objects / Re: Sending SMS with a Sony Ericsson K700i phone on: February 20, 2012, 04:31:48 am
Why do you want to send it in PDU mode?

Serial1.println("AT+CMGF=0"); // Set PDU mode

If you set it to 1 instead, you dont have to encode the SMS to PDU, but instead use clear text ->> much easier IMO.   smiley-lol

Serial1.println("AT+CMGF=1"); // Set TXT mode

For a more convenient way of handling the comms with the mobile phone, consider using the Sserial2mobile library:
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