433mhz rf multiple transmitter

Projects General Guidance
1

Hi

I am using 433Mhz RF transmitter and receiver.
I have doen project with nrf24l01 in which i was writing adrees for mutilpe transmitter.

here in 433mhz rf can i use multiple transmitter for one receiver.

receiver will on always i need to use different tranmitter. they wont send data at same time.

can anyone please let me know like for example if i lost one transmitter i can use another transmitterw ith same receiver or i need to replace both transmitter and receiver?

2

To my knowledge you only need to replace the transmitter.

Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for advice on (nor for problems with) your project :wink: See About the Installation & Troubleshooting category.

3

Thank you. what will be the maximim range if i cover transmitter and receiver both in seperate plastic box?

4

It depends on the material of the box. Metall is no good. Then it depends on the kind obstacles between transmitter and receiver. Free view gives the longest range.

5

The range you get depends mostly on the antenna, and whether conductive obstacles are between transmitter and receiver. Plastic boxes are not a problem.

For 433 MHz, a balanced dipole works best (one connection to ANT, the other to GND) as shown below. The overall length is about 34 cm.

dipole
dipole1000×597 151 KB

6

You can usually even swap transmitter and receiver types, on the same frequency. That's because they are protocol-less, only provide an on-off digital channel for the software, which codes and decodes the actual bit stream.

7

Thank you everyone for your answers.

i ahve another question receiver data pin has to be connected to pin 11 or can i connect to any other pin?

8

Using what software?

9

i am using arduino uno connected to rf 433mhz receiver as i see by default receiver data must be conncted to din 11, can i change to other pin? if yes how to set up the data receiving pin?

10

Nothing in your answer says anything about the software.

11

what software are you aksing about i am using arduino

12

i am doing comminicatioj using rf 433mhz tranmitter and receiver.

my question was to ask about receiver pin. i dont understand how does the software matters to this

13

The receiver pin is defined in software. At least, it is in RadioHead. What library are you using?

14

#include <RH_ASK.h>

i am using radio head

15

Read the documentation. It may be only comments in the source file. IIRC, you only have to edit one line, to change the pin number.

Isn't that where you identified pin 11 in the first place? Or, are you depending on some code from Instructables or other blog site?

16

Thanks. can ypu please help me how can i find source file and edit

17

I will, if you tell me what difficulty you are having in finding it. If you installed the library, it will be in the Libraries folder.

Edit - actually you can specify the pin assignment from the constructor:
https://www.airspayce.com/mikem/arduino/RadioHead/classRH__ASK.html#af56e19d316152a0ca97c9e9fbee4191e

No need to mess with the library files.

All I did, was read the documentation. Please get used to doing that.

18

I think my zip fle is old van you please send me link to download the libarry zip file which you sent me

19

I believe a download is available from the web site I linked to. Else, you can find a link there to the download...

20

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