I recently started developing an interest in tinkering with my Arduino. I bought 433 MHz Transmitters and Recievers (model number: XY-MK-5V).

But when I try using them I have pratically no range: without an antenna the chips have to be nearly touching and even with an antenna I don't get even a meter of range.

Am I doing something wrong? It seems like they should have more range. I'm currently supplying them with 5V from the Arduino, because when I supplied the transmitter with 12V it would not transmit anything.

Thanks in advance Mt_266Transmitter Front

[Transmitter Back[2] [Reciever Front[3] Reciever Back

  • Powering the transmitter with 12V may destroy it or even may destroy the connected Arduino. You'll need two antennas(/wires) with about 17.5 cm length, one soldered to the transmitter and one to the receiver. There is also a possibility that one modules is defect. Have you a second pair to test? – Peter Paul Kiefer Oct 31 '19 at 12:32
  • Thanks for your help. I already tried all different lengths of wire antennas without much of an improvement (I got my best result with 25cm). I've got two pairs to compare and all of them have the same range. – Mt_266 Nov 1 '19 at 13:56
  • Two pair's are not working. Wow, that's strange. Are there other device at your location that transmits eventually 433 MHz? A remote weather station or something else. – Peter Paul Kiefer Nov 1 '19 at 14:04
  • Can you test the setup at another location, e.g. at school or at work or at a friends home? Just to be sure. – Peter Paul Kiefer Nov 1 '19 at 14:33
  • There are some FHEM-Modules using 433 MHz at my home. I'll test the Reciever and Transmitter in another location soon and let you know if the connection improved. – Mt_266 Nov 3 '19 at 14:14

Browse other questions tagged or ask your own question.