I am sending square waves actually and did not check the rise and fall times. Did you refer to sawtooth waveforms or something that is not a square wave?

Yes and this is exactly the case. For instance when I send 6 bytes of data, the last for bytes are always safely arrives and appears on the lcd but the first two bytes are very inconsistent, they may be true or false. Thank you for your advice.

It is actually that I am sending ascii characters from one microcontroller to the other and then display it on the lcd. But the characters that are displayed on the lcd are not as expected. I don't know if this is due to the noise corrupting the data or is it just a transmission issue with the hardware I am using. As for the source of the noises, I can not point a certain source that is using 433 MHz for communication in the environment that is dominating my module.

I did not check if the signal was indeed a carrier, unfortunately I don't have the photo of the waveform rn but I can sure post it tomorrow. I have chosen the ground of the battery in the remote control as the ground of the probe.

Can you recommend me a thread to follow since I don't have a comprehensive knowledge on transistors, or any other easier and more suitable ways to perform this task?

@dim actually I ve never used that one so..