Hi all,
I've been working with a simple NRF24 and i decided to buy a NRF24 with the antenna that
as described has 1100m (1.1km) Range.
My questions:
Post a link to the module (but it seems very unlikely that you will actually get the advertised range).
NRF24L01 modules are bidirectional, and their normal operation requires bidirectional communication in order to verify that messages are successfully transferred. The chip data sheet explains the operation.
The NRF24 antenna : Basic Antenna that NRF24 use
The antennas that I wanna use to improve the signal (but can i use them??):
1st Antenna
2nd Antenna
So when you mean "bidirectional" it actually would work to send and receive data just with 2
modules?
For example I'd like to Send and receive data with just 2 NRF24 modules instead to use 4
with 2 to transmit and other 2 to receive.
It is possible to T/R data only with 2 modules if yes please give me an example
if not, why "?" and how can I T/R data.
So when you mean "bidirectional" it actually would work to send and receive data just with 2
modules?
Yes.
Data sheet.
Quote
So when you mean "bidirectional" it actually would work to send and receive data just with 2
modules?
Yes.
Data sheet.
I've seen datasheet what about example, code, for arduino.
Have you tried Google? Lots of Arduino projects use that radio.
Yea, right, why to ask on forums when there is google but wait aren't google searching on forums post too?
qq
Yea, right, why to ask on forums when there is google
Because if what you want is already available and explained, it is a huge waste of everyone's time to re-explain everything to you.
Because if what you want is already available and explained, it is a huge waste of everyone's time to re-explain everything to you.
I came here for a reason, I can't find what I need, If you can't explain or you don't know or you don't like
to explain to me how it's working then don't waste your time with me.
I need a person who knows and can give me a example how to use 2x nRF24L01 module in both
directions (to transmit and receive data with only 2 modules).
Thanks
The two antennae that you cite would appear to be omnidirectional. I doubt they would have any gain over the coaxial half wave dipole that you illustrate - but perhaps if you cite the datasheets for each, we might be able to figure it out.
The RF24 library contains a number of examples of bi-directional use.
See here - https://arduino-info.wikispaces.com/nRF24L01-RF24-Examples
Paul__B:
The two antennae that you cite would appear to be omnidirectional. I doubt they would have any gain over the coaxial half wave dipole that you illustrate - but perhaps if you cite the datasheets for each, we might be able to figure it out.
Quite, the only way to get a higher gain antenna would be to use a directional antenna such as a Yagi.
Russell.
I have some of those.
Domino60:
I've been working with a simple NRF24 and i decided to buy a NRF24 with the antenna that
as described has 1100m (1.1km) Range.
Pity you didn't provide a link, eh? It's like me saying I bought a dog which is described as quite frightening. More facts would help.
My own experience is that even with a short antenna (like this one) I only got around 40 m range.
The devices are bi-directional but not at the same time. So you can transmit a message, and then get a response. In fact the library lets you know if the message got through.
I came here for a reason, I can't find what I need, If you can't explain or you don't know or you don't like
to explain to me how it's working then don't waste your time with me.I need a person who knows and can give me a example how to use 2x nRF24L01 module in both
directions (to transmit and receive data with only 2 modules).
We are here for a reason too. That is to help people after Googling and reading the documentation fails. Not to provide personal tuition if you are too lazy to do that for yourself.
Oh I see you posted the links (well, images anyway) after some prompting. Better late than never.
I'd be a little surprised if they extended the range from what is for me, basically the length of my house, to over a kilometre.
I think another relevant parameter would be the power output of the transmitter. Do the advertising for these antennae claim they will work at 1.1 km for this particular module? Or just if you pump enough watts into it? In any case I think the 2.4 GHz band is supposed to be for short-range devices like routers, so the likelihood that you can get past a few thousand routers and get good reception at the other end would be low.
If you want range in the 2.4GHz band then use parabolic reflectors. Else use a
lower frequency such as the 433MHz ISM band. Lower frequency = large dipole =
more range (all else being equal).
My own experience is that even with a short antenna (like this one) I only got around 40 m range.
Then how people get full 1km range? This is an example and my source (one direction signal)
That video mentions a "high power" module. I don't believe mine is high power.
That video mentions a "high power" module. I don't believe mine is high power.
When he said high power one he mean the ones with the antenna.
Do you mean that you used the pcb antenna ones? I got that ones too and i wanna buy with the
antenna, looked on youtube a lot of videos and thinking to buy few of them.
As I seed from the video you can send a lot of pack per second so thinking about that, let's say we got minimum
20 packs per second, what i need is to transmit and receive data only from 2 modules.
For example, I got some sensors in my car and a graphical interface software on my computer, i wanna control
the car and get the data from the sensors which are in the car to my computer and see them real time.
Did he? I have one with the (external) antenna. Still only got around 40m max.
russellz:
Quite, the only way to get a higher gain antenna would be to use a directional antenna such as a Yagi.
MarkT:
If you want range in the 2.4GHz band then use parabolic reflectors.
Actually, Patch antennae or Microstrip antennae are commonly used.
