Boost 433 MHz receiver module receiving signal (XY-MK-5V)
Are you sure that your module works well to 12&nbsp;V?

Since it is the "XY-MK-5V" model I think it has the voltage up to 5&nbsp;V as ideal.

For all I know, these modules work well between 3.3&nbsp;V and 5&nbsp;V, maybe saturating the circuit.

Really, the transmitter work with up to 12&nbsp;V.

But I suspect that it does not work at the frequency in question. See, there are a lot of bad information on the Internet about them.




Product Model: MX-FS-03V
Launch distance: 20-200 meters (different voltage, different results)
Operating voltage: 3.5-12&nbsp;V
Dimensions: 19 * 19&nbsp;mm
Operating mode: AM
Transfer rate: 4&nbsp;KB/s
Transmitting power: 10&nbsp;mW
Transmitting frequency: 315&nbsp;MHz
An external antenna: 25&nbsp;cm ordinary multi-core or single-core line





Product Model: MX-05V
Operating voltage: DC5V
Quiescent Current: 4&nbsp;mA
Receiving frequency:315&nbsp;MHz
Receiver sensitivity:-105&nbsp;dB


See more at: How to use 315 MHz RF transmitter and receiver modules with an Arduino