Hi all, I am very beginer in both arduino and xbee. I do some project to measuring distance using rssi feature from xbee. Is anyone have experience on this? Actually i already got the rssi by reading from arduino, but i have no idea how to calculate the rssi to get the distance (in meters or mm). Have you any solution? Your help will be very helpfull for me. Sorry, my english is not good enough.. :) Thanks in advance..
I'm a newbie in arduino & xbee project too, but your idea seems not too
good...
Because the relation between RSSI (which is a measure of strength of radio
signal between two radios) and the phisical distance between the radios is
not ax exact relation, many other variables are involved in determining the
quality of radio link (and so also the RSSI value). Moreover the RSSI
change by moving of some [mm] the two radios is uncommensurable, it's many
order of magnitude fewer that the white noise, so you can't measure it.
I suggest you to look for some ultrasonic distance sensor capable, with
arduino, to measure distance from [cm] to [m] deoending on model... and
with arduino, xbee and an ultrasonic distance sensor you can measure
distance also wifi... :)
> Hi all,
> I am very beginer in both arduino and xbee. I do some project to measuring
> distance using rssi feature from xbee. Is anyone have experience on this?
> Actually i already got the rssi by reading from arduino, but i have no idea
> how to calculate the rssi to get the distance (in meters or mm). Have you
> any solution? Your help will be very helpfull for me. Sorry, my english is
> not good enough.. :)
> Thanks in advance..
> ardan,
> --
> You received this message because you are subscribed to the Google Groups
> "xbee-api" group.
> To view this discussion on the web visit
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-- Ing. Mattia Fiorini
Environmental Engineer
Natural and Industrial risk management
Ph.D. student @ CIMA Research Foundation
www.cimafoundation.org +39 347 4752373
mattia.fior...@gmail.com
mattia.fior...@cimafoundation.org
Thanks for your suggestions. Actually i felt pessimist when i look at the RSSI value and it's continously changing even both my xbees not moving. So it seems not accurate, isn't it? But before i try another solution, i mean before change the device using ultrasonic or the other, i still curious how to calculate the RSSI become distance between two radios even it's not accurate. Can you give me some help? :(
On Tuesday, October 23, 2012 4:59:48 AM UTC+8, Matt wrote:
> Hy Ardan,
> I'm a newbie in arduino & xbee project too, but your idea seems not too > good... > Because the relation between RSSI (which is a measure of strength of radio > signal between two radios) and the phisical distance between the radios is > not ax exact relation, many other variables are involved in determining the > quality of radio link (and so also the RSSI value). Moreover the RSSI > change by moving of some [mm] the two radios is uncommensurable, it's many > order of magnitude fewer that the white noise, so you can't measure it.
> I suggest you to look for some ultrasonic distance sensor capable, with > arduino, to measure distance from [cm] to [m] deoending on model... and > with arduino, xbee and an ultrasonic distance sensor you can measure > distance also wifi... :)
> I hope these suggestions will be useful for you,
>> Hi all, >> I am very beginer in both arduino and xbee. I do some project to >> measuring distance using rssi feature from xbee. Is anyone have experience >> on this? Actually i already got the rssi by reading from arduino, but i >> have no idea how to calculate the rssi to get the distance (in meters or >> mm). Have you any solution? Your help will be very helpfull for me. Sorry, >> my english is not good enough.. :) >> Thanks in advance..
>> ardan,
>> -- >> You received this message because you are subscribed to the Google Groups >> "xbee-api" group. >> To view this discussion on the web visit >> https://groups.google.com/d/msg/xbee-api/-/f724bp8WiKgJ. >> To post to this group, send email to xbee...@googlegroups.com<javascript:> >> . >> To unsubscribe from this group, send email to >> xbee-api+u...@googlegroups.com <javascript:>. >> For more options, visit this group at >> http://groups.google.com/group/xbee-api?hl=en.
> -- > Ing. Mattia Fiorini > Environmental Engineer > Natural and Industrial risk management > Ph.D. student @ CIMA Research Foundation > www.cimafoundation.org > +39 347 4752373 > mattia....@gmail.com <javascript:> > mattia....@cimafoundation.org <javascript:>
You can't do that because the signal you recieve from one module that is 10 meters away might be the same that one which is 2 meters away but behind a wall. You can't not get an accurate relation because you are ignoring factors like noise in the system from other RF emitions, obstacles,etc.
You might be able to get something more close to the real distance if you had many recievers and know their position and getting the signal from the node that you wan't to know but even like that you would get a poor aproximation. That would be something like triangulation.
Anyway, don't even waste time going that way....
Later!
El martes, 23 de octubre de 2012 00:28:54 UTC+2, ardan escribió:
> Thanks for your suggestions. Actually i felt pessimist when i look at the > RSSI value and it's continously changing even both my xbees not moving. So > it seems not accurate, isn't it? But before i try another solution, i mean > before change the device using ultrasonic or the other, i still curious how > to calculate the RSSI become distance between two radios even it's not > accurate. Can you give me some help? :(
> Thanks,
> Ardan
> On Tuesday, October 23, 2012 4:59:48 AM UTC+8, Matt wrote:
>> Hy Ardan,
>> I'm a newbie in arduino & xbee project too, but your idea seems not too >> good...
>> Because the relation between RSSI (which is a measure of strength of >> radio signal between two radios) and the phisical distance between the >> radios is not ax exact relation, many other variables are involved in >> determining the quality of radio link (and so also the RSSI value). >> Moreover the RSSI change by moving of some [mm] the two radios is >> uncommensurable, it's many order of magnitude fewer that the white noise, >> so you can't measure it.
>> I suggest you to look for some ultrasonic distance sensor capable, with >> arduino, to measure distance from [cm] to [m] deoending on model... and >> with arduino, xbee and an ultrasonic distance sensor you can measure >> distance also wifi... :)
>> I hope these suggestions will be useful for you,
>>> Hi all,
>>> I am very beginer in both arduino and xbee. I do some project to >>> measuring distance using rssi feature from xbee. Is anyone have experience >>> on this? Actually i already got the rssi by reading from arduino, but i >>> have no idea how to calculate the rssi to get the distance (in meters or >>> mm). Have you any solution? Your help will be very helpfull for me. Sorry, >>> my english is not good enough.. :)
>>> Thanks in advance..
>>> ardan,
>>> -- >>> You received this message because you are subscribed to the Google >>> Groups "xbee-api" group.
>>> To view this discussion on the web visit >>> https://groups.google.com/d/msg/xbee-api/-/f724bp8WiKgJ.
>>> To post to this group, send email to xbee...@googlegroups.com.
>>> To unsubscribe from this group, send email to >>> xbee-api+u...@googlegroups.com.
>>> For more options, visit this group at >>> http://groups.google.com/group/xbee-api?hl=en.
>> -- >> Ing. Mattia Fiorini
>> Environmental Engineer
>> Natural and Industrial risk management
>> Ph.D. student @ CIMA Research Foundation
>> www.cimafoundation.org >> +39 347 4752373
>> mattia....@gmail.com
>> mattia....@cimafoundation.org
Thanks for spend time and thought on this. As you said in the last, yes, i do triangulation in this case. I used 4 xbee in a room not more than 10m x 10m, 3 fix in position and 1 as traceable. So, what i had done is having rssi from tracable xbee. Next step, i will do :
1. Plot the rssi measurement in array / excel / i dunno still have no idea for better serial data logging. Any idea? (at least i can do serial data logging for any works later)
2. Because i do it in small room with no any obstacles, i'll try measure the distance based on rssi.
OK, just ignore point 2 then. I will focused for the first, where i still dont understand how to plot real time serial data from uart/usb/rs232 in an array or excel or saving in the database for monitoring the serial data value. so we can do post processing then.. I hope someone can help me.. :(
Almost forget, i use Visual Studio 2010 and C++. If we can do in another programming languages, please let me know! I will learn it too..
Thanks in advance Masters..
On Tuesday, October 23, 2012 7:32:54 PM UTC+8, Alex Mendez wrote:
> Hi,
> You can't do that because the signal you recieve from one module that is > 10 meters away might be the same that one which is 2 meters away but behind > a wall. You can't not get an accurate relation because you are ignoring > factors like noise in the system from other RF emitions, obstacles,etc.
> You might be able to get something more close to the real distance if you > had many recievers and know their position and getting the signal from the > node that you wan't to know but even like that you would get a poor > aproximation. That would be something like triangulation.
> Anyway, don't even waste time going that way....
> Later!
> El martes, 23 de octubre de 2012 00:28:54 UTC+2, ardan escribió:
>> Hi Mattia,
>> Thanks for your suggestions. Actually i felt pessimist when i look at the >> RSSI value and it's continously changing even both my xbees not moving. So >> it seems not accurate, isn't it? But before i try another solution, i mean >> before change the device using ultrasonic or the other, i still curious how >> to calculate the RSSI become distance between two radios even it's not >> accurate. Can you give me some help? :(
>> Thanks,
>> Ardan
>> On Tuesday, October 23, 2012 4:59:48 AM UTC+8, Matt wrote:
>>> Hy Ardan,
>>> I'm a newbie in arduino & xbee project too, but your idea seems not too >>> good...
>>> Because the relation between RSSI (which is a measure of strength of >>> radio signal between two radios) and the phisical distance between the >>> radios is not ax exact relation, many other variables are involved in >>> determining the quality of radio link (and so also the RSSI value). >>> Moreover the RSSI change by moving of some [mm] the two radios is >>> uncommensurable, it's many order of magnitude fewer that the white noise, >>> so you can't measure it.
>>> I suggest you to look for some ultrasonic distance sensor capable, with >>> arduino, to measure distance from [cm] to [m] deoending on model... and >>> with arduino, xbee and an ultrasonic distance sensor you can measure >>> distance also wifi... :)
>>> I hope these suggestions will be useful for you,
>>>> Hi all,
>>>> I am very beginer in both arduino and xbee. I do some project to >>>> measuring distance using rssi feature from xbee. Is anyone have experience >>>> on this? Actually i already got the rssi by reading from arduino, but i >>>> have no idea how to calculate the rssi to get the distance (in meters or >>>> mm). Have you any solution? Your help will be very helpfull for me. Sorry, >>>> my english is not good enough.. :)
>>>> Thanks in advance..
>>>> ardan,
>>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "xbee-api" group.
>>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msg/xbee-api/-/f724bp8WiKgJ.
>>>> To post to this group, send email to xbee...@googlegroups.com.
>>>> To unsubscribe from this group, send email to >>>> xbee-api+u...@googlegroups.com.
>>>> For more options, visit this group at >>>> http://groups.google.com/group/xbee-api?hl=en.
>>> -- >>> Ing. Mattia Fiorini
>>> Environmental Engineer
>>> Natural and Industrial risk management
>>> Ph.D. student @ CIMA Research Foundation
>>> www.cimafoundation.org >>> +39 347 4752373
>>> mattia....@gmail.com
>>> mattia....@cimafoundation.org
I wouldn't quite give up on distance measurement using RSSI. A question to
answer for yourself is how accurate you need to be. If the configuration
of the radio (housing, obstacles, motion etc.) is controlled, I would
recommend coming up with some empirical observations and then fitting a
signal loss model. The moving RSSI observations could be smoothed out and
the fact that you have multiple fixed points helps tremendously. I use
RSSI for crude distance measuring and have been pleased with the results
(I'm not requiring precision however, just gross relative positioning for a
few radios).
Set up your XBees to heartbeat and then record those observations. See
what you get and how stable the model is.
On Tue, Oct 23, 2012 at 10:18 AM, ardan <dano...@gmail.com> wrote:
> Hi Alex,
> Thanks for spend time and thought on this. As you said in the last, yes, i
> do triangulation in this case. I used 4 xbee in a room not more than 10m x
> 10m, 3 fix in position and 1 as traceable. So, what i had done is having
> rssi from tracable xbee. Next step, i will do :
> 1. Plot the rssi measurement in array / excel / i dunno still have no idea
> for better serial data logging. Any idea? (at least i can do serial data
> logging for any works later)
> 2. Because i do it in small room with no any obstacles, i'll try measure
> the distance based on rssi.
> OK, just ignore point 2 then. I will focused for the first, where i still
> dont understand how to plot real time serial data from uart/usb/rs232 in an
> array or excel or saving in the database for monitoring the serial data
> value. so we can do post processing then.. I hope someone can help me.. :(
> Almost forget, i use Visual Studio 2010 and C++. If we can do in another
> programming languages, please let me know! I will learn it too..
> Thanks in advance Masters..
> regards,
> ardan
> On Tuesday, October 23, 2012 7:32:54 PM UTC+8, Alex Mendez wrote:
>> Hi,
>> You can't do that because the signal you recieve from one module that is
>> 10 meters away might be the same that one which is 2 meters away but behind
>> a wall. You can't not get an accurate relation because you are ignoring
>> factors like noise in the system from other RF emitions, obstacles,etc.
>> You might be able to get something more close to the real distance if you
>> had many recievers and know their position and getting the signal from the
>> node that you wan't to know but even like that you would get a poor
>> aproximation. That would be something like triangulation.
>> Anyway, don't even waste time going that way....
>> Later!
>> El martes, 23 de octubre de 2012 00:28:54 UTC+2, ardan escribió:
>>> Hi Mattia,
>>> Thanks for your suggestions. Actually i felt pessimist when i look at
>>> the RSSI value and it's continously changing even both my xbees not moving.
>>> So it seems not accurate, isn't it? But before i try another solution, i
>>> mean before change the device using ultrasonic or the other, i still
>>> curious how to calculate the RSSI become distance between two radios even
>>> it's not accurate. Can you give me some help? :(
>>> Thanks,
>>> Ardan
>>> On Tuesday, October 23, 2012 4:59:48 AM UTC+8, Matt wrote:
>>>> Hy Ardan,
>>>> I'm a newbie in arduino & xbee project too, but your idea seems not too
>>>> good...
>>>> Because the relation between RSSI (which is a measure of strength of
>>>> radio signal between two radios) and the phisical distance between the
>>>> radios is not ax exact relation, many other variables are involved in
>>>> determining the quality of radio link (and so also the RSSI value).
>>>> Moreover the RSSI change by moving of some [mm] the two radios is
>>>> uncommensurable, it's many order of magnitude fewer that the white noise,
>>>> so you can't measure it.
>>>> I suggest you to look for some ultrasonic distance sensor capable, with
>>>> arduino, to measure distance from [cm] to [m] deoending on model... and
>>>> with arduino, xbee and an ultrasonic distance sensor you can measure
>>>> distance also wifi... :)
>>>> I hope these suggestions will be useful for you,
>>>>> Hi all,
>>>>> I am very beginer in both arduino and xbee. I do some project to
>>>>> measuring distance using rssi feature from xbee. Is anyone have experience
>>>>> on this? Actually i already got the rssi by reading from arduino, but i
>>>>> have no idea how to calculate the rssi to get the distance (in meters or
>>>>> mm). Have you any solution? Your help will be very helpfull for me. Sorry,
>>>>> my english is not good enough.. :)
>>>>> Thanks in advance..
> To post to this group, send email to xbee-api@googlegroups.com.
> To unsubscribe from this group, send email to
> xbee-api+unsubscribe@googlegroups.com.
> For more options, visit this group at
> http://groups.google.com/group/xbee-api?hl=en.
if you have setup 5 of them in known positions you might get some useful data as Mauricio points out. What I'd suggest is that you take several measures of every RSSI reading which would make it more reliable, the more you take, the more reliable it is.
To plot it would depend on what you are using. But the easiest way I think would be trying to log the data with Bray's terminal<https://sites.google.com/site/terminalbpp/> or I would make a program with whatever you prefer, C++ , Java , Python... and recieve the serial data and with that make a CSV file with your data and then import the file to excel which will make it really easy to plot.
You could also make easily a program with Processing that would plot your data in real time.
Those are the easiest ways I come up with right now.
Good luck!
El martes, 23 de octubre de 2012 19:18:41 UTC+2, ardan escribió:
> Thanks for spend time and thought on this. As you said in the last, yes, i > do triangulation in this case. I used 4 xbee in a room not more than 10m x > 10m, 3 fix in position and 1 as traceable. So, what i had done is having > rssi from tracable xbee. Next step, i will do :
> 1. Plot the rssi measurement in array / excel / i dunno still have no idea > for better serial data logging. Any idea? (at least i can do serial data > logging for any works later)
> 2. Because i do it in small room with no any obstacles, i'll try measure > the distance based on rssi.
> OK, just ignore point 2 then. I will focused for the first, where i still > dont understand how to plot real time serial data from uart/usb/rs232 in an > array or excel or saving in the database for monitoring the serial data > value. so we can do post processing then.. I hope someone can help me.. :(
> Almost forget, i use Visual Studio 2010 and C++. If we can do in another > programming languages, please let me know! I will learn it too..
> Thanks in advance Masters..
> regards,
> ardan
> On Tuesday, October 23, 2012 7:32:54 PM UTC+8, Alex Mendez wrote:
>> Hi,
>> You can't do that because the signal you recieve from one module that is >> 10 meters away might be the same that one which is 2 meters away but behind >> a wall. You can't not get an accurate relation because you are ignoring >> factors like noise in the system from other RF emitions, obstacles,etc.
>> You might be able to get something more close to the real distance if you >> had many recievers and know their position and getting the signal from the >> node that you wan't to know but even like that you would get a poor >> aproximation. That would be something like triangulation.
>> Anyway, don't even waste time going that way....
>> Later!
>> El martes, 23 de octubre de 2012 00:28:54 UTC+2, ardan escribió:
>>> Hi Mattia,
>>> Thanks for your suggestions. Actually i felt pessimist when i look at >>> the RSSI value and it's continously changing even both my xbees not moving. >>> So it seems not accurate, isn't it? But before i try another solution, i >>> mean before change the device using ultrasonic or the other, i still >>> curious how to calculate the RSSI become distance between two radios even >>> it's not accurate. Can you give me some help? :(
>>> Thanks,
>>> Ardan
>>> On Tuesday, October 23, 2012 4:59:48 AM UTC+8, Matt wrote:
>>>> Hy Ardan,
>>>> I'm a newbie in arduino & xbee project too, but your idea seems not too >>>> good...
>>>> Because the relation between RSSI (which is a measure of strength of >>>> radio signal between two radios) and the phisical distance between the >>>> radios is not ax exact relation, many other variables are involved in >>>> determining the quality of radio link (and so also the RSSI value). >>>> Moreover the RSSI change by moving of some [mm] the two radios is >>>> uncommensurable, it's many order of magnitude fewer that the white noise, >>>> so you can't measure it.
>>>> I suggest you to look for some ultrasonic distance sensor capable, with >>>> arduino, to measure distance from [cm] to [m] deoending on model... and >>>> with arduino, xbee and an ultrasonic distance sensor you can measure >>>> distance also wifi... :)
>>>> I hope these suggestions will be useful for you,
>>>>> Hi all,
>>>>> I am very beginer in both arduino and xbee. I do some project to >>>>> measuring distance using rssi feature from xbee. Is anyone have experience >>>>> on this? Actually i already got the rssi by reading from arduino, but i >>>>> have no idea how to calculate the rssi to get the distance (in meters or >>>>> mm). Have you any solution? Your help will be very helpfull for me. Sorry, >>>>> my english is not good enough.. :)
>>>>> Thanks in advance..
>>>>> ardan,
>>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "xbee-api" group.
>>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msg/xbee-api/-/f724bp8WiKgJ.
>>>>> To post to this group, send email to xbee...@googlegroups.com.
>>>>> To unsubscribe from this group, send email to >>>>> xbee-api+u...@googlegroups.com.
>>>>> For more options, visit this group at >>>>> http://groups.google.com/group/xbee-api?hl=en.
>>>> -- >>>> Ing. Mattia Fiorini
>>>> Environmental Engineer
>>>> Natural and Industrial risk management
>>>> Ph.D. student @ CIMA Research Foundation
>>>> www.cimafoundation.org >>>> +39 347 4752373
>>>> mattia....@gmail.com
>>>> mattia....@cimafoundation.org
Since i said i am newbe using xbee, i got my hard work this week.. and i face the new problem, how to measure (packet data) transfer time travel..? i have been looking for some sample code but i got nothing.. do i need additional RTC? or i can use internal timer of arduino? anyone have sample code for me? i'm feeling stuck in this way.. omg :( sorry for bothering all of you, but your help will very usefull for me doing this and i really appreciate it..
