433Mhz Transmitter Range of just 2-3cm

Projects Networking, Protocols, and Devices
1

Hi,
I recently build my own kind of Temperature Control System and want to connect (at that time) one Arduino Pro Mini via 433 MHZ with my Arduino Uno. Therefore I bought taht Transmitter/Receiver set:

I saw that some people get 6-12meters with that set, but in my case it just works on 2-5cm.
The setup is really simple. on the Pro Mini I have the vcc on pin 12, data on pin 10 and gnd on gnd.
Everytime I send data, I set the pin 12 to HIGH.
On the Uno its the same setup but always on high to be able to receive all the time.
Does anybody know that issue? Do I need an external antenna for that? Or could it be bad soldering as I'm pretty new to that?

Thanks in advance

2

Do I need an external antenna for that?

Couldn't hurt.

What does your code look like? Are you trying to send data too fast? Those cheap devices need very low data transfer rates.

3

Use 17 cm of straight wire for the external antenna on both RX and TX modules.

4

jremington:
Use 17 cm of straight wire for the external antenna on both RX and TX modules.

Who are you and what have you done with the real jremington who would've posted his dipole rig by now

5

One step at a time.