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1  Community / Products and Services / Re: Norduino when Arduino meets Nordic! on: April 05, 2013, 05:01:23 am
Exactly I am doing two versions one with the embedded antenna but flat connector type and the other one with the SMA.
Will post the new schematics any help is welcome.  smiley-grin
2  Community / Products and Services / Re: Norduino when Arduino meets Nordic! on: April 05, 2013, 04:30:03 am
Yes so I do have a shop where you can buy it but I am working a on a new version and it will take some time for the new batch to come by.
I will keep the forum posted.
3  Community / Products and Services / Re: Norduino when Arduino meets Nordic! on: March 14, 2013, 06:11:35 pm
Yes it works pretty well, as a proof Maniacbug had my kit and tested it some time ago:

Original link:
http://www.flickr.com/photos/maniacbug/7869287530/in/photostream
4  Using Arduino / Networking, Protocols, and Devices / Re: Maniacbug- Network Layer for RF24L01+ Radios on: January 12, 2012, 12:29:07 pm
For the non plus version you can only select between 1 Mbps or 2 Mbps but not 256kbps.

Link Margin = 20dBm – (-85dBm) + 3dBi + 3dBi = 111 dB
which is more than 100 meters!

It looks like they are not the + version.
5  Using Arduino / Networking, Protocols, and Devices / Re: Maniacbug- Network Layer for RF24L01+ Radios on: January 11, 2012, 06:37:38 am
Regarding your mobile interface did you have a look at OpenRemote?

To increase the range you could use a modified nrf24l01+ module (PA + LNA) such as this:


It will give you +20dBm of additional power (do your maths and calculate the increase in range).

I have an old non plus version:


Nordic RF24L01PA U22 by epokh, on Flickr

Which worked pretty well and can fit your footprint whereas the plus version can fit also the Norduino header.

6  Using Arduino / Networking, Protocols, and Devices / Re: Maniacbug- Network Layer for RF24L01+ Radios on: January 10, 2012, 09:01:16 am
Yes I suggest you use SMA antennas regardless.
I also suggest to calculate the theoretical path loss and then validate your experimental data (ups my PhD just finished sorry!).
An example of calculation for a standard 2.4 Ghz Wifi router:
transmit power 125 mWatt = 21 dBm
receiver sensitivity -97 dBm
antenna gain 2.5 dBi

The attenuation is:
21 dBm – (-97 dBm) + 2.5 dBi + 2.5 dBi = 123 dB
(we add two antenna gain, because tx and rx)
In line-of-site conditions, every 6dB of link margin will double the transmission range. A radio with a link margin of 111
dB has 12 dB less link margin than the computed one, and thus it can only achieve a quarter of the range.

Then we have to consider the path loss:
Link Margin = Transmit Power – Receiver Sensitivity + Antenna Gain – Path Loss
Where the Free Space Loss is calculated with:
PathLoss= 20 Log_10(Mhz)+20 Log_10(distance)-147.55
In line-of-site conditions the path loss can be determined by using a mathematical formula (Friis transmission
equation). The path loss for a 2.4 GHz in free space is given for several distances in the table below.

10 meters81dB
100 meters101dB

Now let's assume that your antenna (like the one I have used for my Norduino) have a 3dBi, the nrf24l01+ has 1mWatt so is 0dBm.
The receiver sensitivity is:
-94dBm RX sensitivity a 250kbps
-82dBm RX sensitivity at 2Mbps
-85dBm RX sensitivity at 1Mbps

So the link margin is:
Link Margin = 0dBm – (-85dBm) + 3dBi + 3dBi = 91 dB
So the maximum distance that you can achieve at 91 dB is less than 30 meters.
This is what I measured in my test with Norduino outside on a street.

Of course then you have to consider multi path effects which will introduce further attenuation.
There are several studies about indoor RF propagation but then you go in the realm of simulations which is when you need some big computers.

I hope my computations will help you.
Keep my posted I'm really excited to sponsor your project.
 
7  Topics / Home Automation and Networked Objects / XMote Sens and Orient project for mobile sensor networks on: October 18, 2011, 10:02:51 am
Hello guys,
I have just released this small but interesting project:
www.norduino.com/xmote-sens-and-orient-are-ready/
I have been recently involved in several sensor network projects including the Jeenode, Norduino, MSPNode (andy+simpleavr)
and I'm exploring more Bluetooth based solutions for Android related ideas.
The thing can also be interfaced to Xbee and to a base station which will also be based on Arduino.
If somebody is interested to test/play with this thing please let me know as I have few PCBs left.

Cheers.
8  Community / Products and Services / Re: Norduino when Arduino meets Nordic! on: April 21, 2011, 04:20:39 am
For anybody interested I have made an extensive inventory:
http://norduino.robomotic.com/kits-are-ready/
I'm working now on the USB interface.
9  Community / Products and Services / Norduino when Arduino meets Nordic! on: April 12, 2011, 01:18:07 pm
I'm very happy to announce a new Arduino project called Norduino:  smiley-sweat


Norduinos by epokh, on Flickr

What is Norduino?
Norduino is essentially a wireless sensor node similar to a Jeenode.
There's a better explanation on my webpage.

Can I convert a Jeenode to a Norduino?
Yes you can! You can just take your jeenode and use the converter board.

Norduino adapter board by epokh, on Flickr

When did it start?
I started this project 4 months ago because I needed a platform to prototype with Nordic
chips.
There's a small time track on this web page.

Features of Norduino:
+ uses Arduino environment
+ hardware and software compatible with existing Jeenode sensors
+ uses a Nordic nrf24l01+ for fast data rate transmission in the 2.4 GHz band
+ can be used with an integrated or external SMA antenna
+ can be used with the Sparkfun Nordic USB adapter
+ can be interfaced to a computer via a NorduinoUSB (in development)


Norduinos with button and acceleromter by epokh, on Flickr

What can you do with that?
Except traditional sensor network applications, is meant to be used for some more "hardcore" benchmarks
including audio and video streaming and mesh networks.

Does it support mesh network?
Not at the moment! Implementing a mesh network library such as the SimpliciTI requires
 a very clever design but I will be very keen to help everybody that wants to go in this way.  smiley

Do you need even more performance?
Yes if you want even less power consumption,
there's a board based on an MSP430.

MSP430 + Nordic by epokh, on Flickr

which is not based on the arduino software BUT I'm porting the original Chris Hulbert code
to this particular board.
Can I buy a kit?
I am planning to do kits if there's demand, at the moment I have put the few boards
which I assembled and tested on my small shop.
If it really takes off I can think about doing a kit version.
I know that soldering SMD is not simple so I have managed to keep everything
at through hole components so the kit will not require any soldering fu skillz.  smiley-lol

The boards available at the moment are listed on this pages 1 ,2

Suggestions and design ideas?
Yes I really want to know what people would like to see from a device like this
and what sorts of accessories will be interesting to plug.


10  Forum 2005-2010 (read only) / Troubleshooting / Re: Arduino + RFM12 - Does not work on: October 21, 2010, 03:19:08 am
I don't know if that can help but I have interfaced an arduino pro mini with an rfm12b.
The only problem will be that running at 8MHz, the SPI cannot reach the same data rate as in the 16MHz case.
11  Forum 2005-2010 (read only) / Development / Re: board running at 16MHz with 3.3V ? on: October 21, 2010, 03:24:41 am
The Jeenodes are basically using the atmega328 3.3V at 16MHz.
I have used the nodes in a sensor network for my home and I didn't see any loss in performance or data. I also have an outdoor temperature sensor and didn't give me any problem (yet).
As the author says:
Quote
Using an ATmega168/328 at 16 MHz with 3.3V exceeds the specs by some 2.7 MHz - but it works just fine.
12  Forum 2005-2010 (read only) / Interfacing / Re: arduino pro mini and rfm12b= nice wireless node on: October 28, 2010, 05:58:45 am
I got my first trasmission working with the chip antenna.

And here a small video:
[media]http://www.youtube.com/watch?v=qf0qDnLbqDc[/media]
13  Forum 2005-2010 (read only) / Interfacing / arduino pro mini and rfm12b= nice wireless node on: October 21, 2010, 03:31:51 am
Hello, i'm recently playing with wireless sensor networks.
This is my first decent unit working.
An arduino pro mini 328 with an rfm12b on a breakout board with a chip or whip antenna.
The project info is on my blog:
http://lab.robomotic.com/
The library I'm using is the same as the one from the Jeenode labs which is very stable and tested.
The breakout boards are fairly simple and sold them soldered or non soldered on the breakout board.
I'm still testing the pcb antenna to maximize the gain.
Next thing I want to add is a DC-DC boost converter so that you can run the arduino pro and the rfm on a small crc 3.0v battery.
Any feedback much appreciated!
 smiley-wink
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