473,395 Members | 1,689 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,395 software developers and data experts.

Zigbee/Xbee Signal Strength Measurement (RSSI)

2
Hey guys, I was kind of hoping that someone could help me out with a project I am working on for school...

We are desigining a robot that someone will approach, and the robot will ask the user if they would like to go to room A, B, or C. (keep in mind all the rooms are in a striagh hallway with no turns).

We have decided to put Xbee modules at each room and an additional xbee module on the robot. In front of each room, we would like to take a signal strength reading from all 3 stationary xbee modules and kind of "tringulate" the robot's location this way (in front of each room, the RSSI of each xbee modules theoretically should be noticably different).

I understand that the pin 6 of the xbee module is the RSSI pin, but i need to know how to set the xbee module mounted on the robot to communicate with the 3 stationary modules and take readings from stationary module. It probably has to do with setting the robot's module to broadcast mode.

Also i have read that i may need to use a PWM filter, but am not sure since I want to receive the signal strength at the sender, not the receiver.

Any help would be greath, thanks!
Nov 16 '08 #1
16 17087
RedSon
5,000 Expert 4TB
Sorry... we get Zigbee and Xbee questions from time to time, but we have no experts on this forum with enough knowledge to be helpful...

Google is your friend.
Nov 17 '08 #2
KDaly
2
Alright, thanks anyways!
Nov 17 '08 #3
Plater
7,872 Expert 4TB
If you use maxstream's XBEE_API to communicate, every communicated message will contain the RSSI value in one of the bytes in the frame.
The RSSI is not a "strength" measurement so much as it is a measurement of interference. i.e. The smaller the number the better...
Nov 18 '08 #4
markmcgookin
648 Expert 512MB
If you use maxstream's XBEE_API to communicate, every communicated message will contain the RSSI value in one of the bytes in the frame.
The RSSI is not a "strength" measurement so much as it is a measurement of interference. i.e. The smaller the number the better...
Someone tie plater's showlaces together ... we can trap him here and he can answer all the xigbee questions
Nov 19 '08 #5
Plater
7,872 Expert 4TB
If you do a search on "xbee" in this forum, you will see i pretty much DO answer all the xbee questions (my experiance is only with the xbee, not with other zigbee protocol implementations)
Nov 19 '08 #6
dove
3
@Plater
hi plater
i'm new here,my project is to send the RSSI value to the base station to localize and track the xbee tag ,i have 4 xbee reader(fixed points),now i'm tring to communicat at first between the tag and one reader ,the problem that i could not read the messag receive in api mode to find the bit 7 rssi.
now my idea is to put the xbee tag in api mode but receive the message from xbee reader with transparent mode(api=0),is this way is right i mean can i communicat between xbee - api=1 and other api=0?????????
Feb 24 '09 #7
Plater
7,872 Expert 4TB
If all you are doing is trying to find the RSSI of surrounding devices then I recomend using the AT ND command. Check it out in the manual, it just scans for nearby XBees giving serialnumber, rssi, etc for each device it finds.
Feb 24 '09 #8
dove
3
@Plater
thanks plater for feedbak,but may be ATND indicates the RSSI of the last hop only.i read many times the packet receive with api is better to read the rssi but i could not communicat between 2 xbees with api.
Feb 24 '09 #9
Plater
7,872 Expert 4TB
ATND does a scan against ALL XBee devices it can find. The RSSI provided is the measurement between the XBee that issued the command and the the XBEE it found (Note: It can find and return multiple XBees/RSSIs with a single call)

If you want to read the RSSI from an API packet, you have to get the remote XBEE to send a message back.
Feb 24 '09 #10
dove
3
@Plater
thanks plater again for feedback,that is i meant in my first letter to you,to use the api mode my idea is to send message from remot xbee( which present xbee reader as i told you befor) in transparent mode api=0,and the xbee tag receive this message in api=1(as a packet)to find the accuracy rssi
is this idea right???
Feb 24 '09 #11
Plater
7,872 Expert 4TB
I am not sure you can do that, as the XBee's internals handle the packet formationing.
Feb 25 '09 #12
@dove
.[/quote]

hi plater ,ATND have not contain the RSSI in xbee seres 2,pliz clarify what do u ment do u main(youto get the remote XBEE to send a message back)???
Feb 25 '09 #13
Plater
7,872 Expert 4TB
Ahh, there's the key phrase everyone was leaving out.
You are using the series2 modules, which use the Zigbee mesh.

You're on your own with those, as I haven't used them.
Their manual is found here though: http://ftp1.digi.com/support/documen...90000976_B.pdf
Feb 25 '09 #14
RedSon
5,000 Expert 4TB
We love Plater!
Feb 25 '09 #15
@Plater
dear,
i'm trying to sendATND from one xbee through ATMEL89c052 to another xbee,
the second just retriev the first line(MY),it should retriv 10 lines,by the way ,sending +++ is success with retriv ok.do you have any idea
Jun 20 '09 #16
Plater
7,872 Expert 4TB
Unless there is something new in the series2 for sending AT commands to a remote modem, the AT commands generally only apply to the local modem
Jun 22 '09 #17

Sign in to post your reply or Sign up for a free account.

Similar topics

1
by: Dominik Kaspar | last post by:
hello i am writing a java program for locating a wireless device within an office environment. i want to use the signal strengths of the surrounding base stations (access points) to estimate the...
2
by: happymeteor | last post by:
Hi, everyone! I've tried to make a program which can get the wireless signal strength of wireless NIC(ex. 802.11b network card). As I know, regardless of whatever vender's NIC is used, in the...
13
by: steve | last post by:
is there an efficient way to detect wap signal strength/network connectivity w/o attempting a lan dependant operation and waiting for it to time-out? tia, steve
1
by: billy | last post by:
i've created the following code based on the classes i've found in the wmi test console. it works however, both this code and in the wmi test console it appears i'm getting two rssi signals from...
4
by: iKiLL | last post by:
Hi all I am working with CF2 and C#. I was hoping that someone could point me in the right direction for how I can determine if there is a GPRS Signal. I am using Merge Replication to SQL...
6
by: Maarten Weyn | last post by:
Is there a way to get the signal strength of all surroundin access points in c# on a vista pc? regards Maarten Weyn
0
by: williambattersea | last post by:
Hello, I'm looking for a way to get wireless signal strength on Windows XP with Python. I see there's a library for Linux, but I can't find anything for windows. However, I see that using WMI I...
3
by: Toby Webb | last post by:
Hi, can anyone help please? I am trying to get infromation from my wireless card, such as signal strength and a list of SSIDs that it can see. I have been able to get the signal strength (see...
0
by: ryjfgjl | last post by:
If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...
0
by: ryjfgjl | last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
0
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
0
BarryA
by: BarryA | last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
1
by: Sonnysonu | last post by:
This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...
0
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
0
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers,...
0
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...
0
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.