Arduino Forum upgrade scheduled for Monday, October 20th, 11am-4pm (CEST). Sorry for the inconvenience!
Pages: [1]   Go Down
Author Topic: problem catching a RF signal with FS1000A 315 MHz and NT-R02B 250MHz-450MHz  (Read 1405 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 3
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hello

I have recently purchased two Arduino Uno boards and with them some equipment which should in time turn in to a remote control car. I am having a problem testing the communication between the two Arduino boards. I have an FS1000A 315 MHz transmitter : http://www.ananiahelectronics.com/FS100A.htm and an NT-R02B 250MHz-450MHz receiver : http://www.nice-tech.cn/en/productshow.asp?id=251. One is connected to one Arduino and the second to another. I've tried to transmit and catch a signal using this guide : http://ilblogdidami.blogspot.com/2013/09/use-arduino-with-rf-modules.html and I havent had any luck so far. I than figured that the receiver might not be supported in the virtual wire library. The receiver also has four data channels and I tried listening on all of them to maybe catch a signal, but nothing.
Does anyone have any idea to how i can do this and why my receiver seems to be catching nothing?

Thank you
Logged

Idaho, US
Offline Offline
Edison Member
*
Karma: 23
Posts: 1280
Special User
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I have an FS1000A 315 MHz transmitter
and an NT-R02B 250MHz-450MHz receiver
So, how are you tuning the receiver to 315MHz?
Logged

Offline Offline
Newbie
*
Karma: 0
Posts: 3
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

that may be part of the problem as I am not really sure how to do that. Is there any useful library to help me with that?
Logged

Idaho, US
Offline Offline
Edison Member
*
Karma: 23
Posts: 1280
Special User
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Not sure. The VirtualWire library is designed for fixed-frequency receivers, so it doesn't know what to do with a variable-frequency receiver unless there's a way to set the frequency in hardware (resistor or cap or crystal value). You need the datasheet for your receiver to tell you how to set the frequency.
Logged

Global Moderator
UK
Offline Offline
Brattain Member
*****
Karma: 318
Posts: 26927
I don't think you connected the grounds, Dave.
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

That seems an awfully broad frequency span for the receiver.
Do you have a datasheet?

Wouldn't it have been simpler to have bought a matched pair Tx/Rx?
Logged

"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

Denmark
Offline Offline
Edison Member
*
Karma: 37
Posts: 1116
Happy Hobbyist
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

If it is this one:

http://www.homface.com/homby_2149929_NT-R02B-RF-Receiver.htm

It is fixed frequence, either 315MHz or 433MHz
Logged

Global Moderator
UK
Offline Offline
Brattain Member
*****
Karma: 318
Posts: 26927
I don't think you connected the grounds, Dave.
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

But it can't be that one, because the OP says 250-450MHz, not 315 or 433MHz.
Logged

"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

Denmark
Offline Offline
Edison Member
*
Karma: 37
Posts: 1116
Happy Hobbyist
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Maybe it just means that you can use the circuit, and depending on the coil and capacior you can set the frequence you want.

This seems to be the same, the specs mention bot 315,433 and 250-450MHz
http://www.nice-tech.cn/en/productshow.asp?id=251

Logged

Offline Offline
Newbie
*
Karma: 0
Posts: 3
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Thank you for all the replies.
The product is definitely this one : http://www.nice-tech.cn/en/productshow.asp?id=251.

Maybe it just means that you can use the circuit, and depending on the coil and capacior you can set the frequence you want.

Do you mean by physically shortening the coil to adjust the frequency?

Oh, and i don't have a datasheet.
« Last Edit: September 12, 2013, 11:17:17 am by Doublel » Logged

Oregon, USA
Offline Offline
Faraday Member
**
Karma: 74
Posts: 2590
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

In addition to (probably) being improperly tuned, the receiver has a decoding chip that expects a certain format of transmission. The only information  in the product description is "Decoding format: PT2272, HS2272, AX5327", which suggests that the data format of transmission has to be compatible with that produced by a PT2262 encoder chip. On the other hand, the transmitter described by the OP does not do any encoding at all. That has to be done by the transmitting micro.

It would be best to buy a compatible TX/RX set or use a 315 MHz receiver with no decoder, and VirtualWire.
« Last Edit: September 12, 2013, 12:19:04 pm by jremington » Logged

"It seems to run on some form of electricity"

Pages: [1]   Go Up
Arduino Forum upgrade scheduled for Monday, October 20th, 11am-4pm (CEST). Sorry for the inconvenience!
Jump to: