OEsirik

What part didnt understand in components?

It is in the receiver cod's main part.

thank you for your comment and sharing.

Yeah I forgot it.I will add it as soon as possibile.

In closed area approximately 3m.But you can obtain better performance if you feed high voltage transmitter (i feed with 5v).

Antenna pin.

first schematic is transmitter second is receiver.main difference between them rf modules connection.Yeah you can use in my opinion.transmitter part almost same, you change the receiver part.remove the rgb leds and add bjt for buzzer.

Thank you for your comment.In my opinion, microcontroller are more easy to using for this purpose,for begginers.Otwerwise you right there iş many devices in 433 mhz so i would used enigma to avoid this Rf traffic.

Thank you for your benefical feedback.

Thank you for your good comment.I just calibrate it , DSO 's datasheet and it has a software update but i did not do yet.

2 or 3m in closed area but if you increase receiver voltage your range will be above 100m in open area.

Thank you for good comment.It is not so sensitive but It can shows basic difference of signals,thus I like it.