why use 433MHz wireless for your projects

Why use 433MHz Wireless in your projects ?

If your thinking why use 433mhz wireless modules in your projects – then keep reading.

The big question is why would you use such a module with other types available on the market ?



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Advantages of using 433MHz


  • Cheap
  • Simple
  • Lower Frequency than other modules


The main advantage of using 433MHz modules is they are cheap and simple.

Another advantage that is rarely spoken about is the frequency itself.  A 433mhz radio wave has different properties to a 2.4GHz radio wave. For starters, 2.4GHz is the resonant frequency of the water molecule, that’s what is used in microwave ovens as water easily absorbs this frequency. Now that is a big problem if your trying to transmit a signal over a long distance outdoors with bad weather where it is raining or foggy as the moisture in the air and rain will soak up the signal.

Also, a 433Mhz radio wave will travel further than that of a 2.4GHz radio wave that has the same power due the longer wave length.


Disadvantages of using 433MHz


  • One Channel
  • Low Data Rate


On the downside,  the frequency is fixed at 433.92 MHz so it is more susceptible to nearby interference from devices operating on the same frequency and the maximum data rate is limited to 9.6kbps which for a simple data link sending temperature values it’s not an issue, you just won’t be able send large data files with any great speed.

Transmitter Specifications


  • Supply Voltage: 3-12V
  • Current usage: 40mA (maximum)
  • Frequency: 433.92MHz
  • Modulation: ASK


Receiver Specifications


  • Supply Voltage: 5V
  • Current usage: 5.5mA (maximum)
  • Frequency: 433.92MHz
  • Modulation: ASK
  • Sensitivity: -100dBm


The receiver operates on 5V and only draws 5.5mA and it has an excellent  sensitivity at -100dBm. If you don’t understand radio terms, 100dBm is actually a very good level with the best receivers being a little more sensitive at around -110 to -115dBm.


Why use 433MHz Wireless in your projects ? | Summary

Using a 433mhz transmitter-receiver pair in your projects can help make them mobile and avoid the use of long wires at the same time keeping your projects simple. I hope this simple review has helped inform you about using 433MHz wireless modules in your projects.

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Now I want to turn it over to you, what do you think about using 433MHz wireless modules in your projects or maybe you have a question about using 433MHz wireless modules ? Either way leave a quick comment on one of my social media profiles at the top of this page.