morse code transceiver

point to point text broadcast

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7 year old zombie project took a leap forward, a coded communicator allowing for point to point coded text communication using any transmitter on any frequency(cb, ham, am, fm shortwave, wifi, gmrs and whatever you want). In this case it is using morse code as a data stream to be encoded at one end and decoded on the other and visa virsa with 433Mhz transceivers. in the future i want to code it to transmit a random cypher as a header for every transmission, that way the encoding is never the same, it would require for contiguous communication that the listener receives the first cypher transmission and also have the correctly encoded equipment to translate it. in this way it would mimic the enigma box of ww2 but with vastly improved if not impervious encryption, that part i am not going to post or use as it is a grievous violation of FCC law, but i am going make it, just to see if i can..


sketch of the code, some of which i borrowed from other sources

plain - 4.19 kB - 09/19/2019 at 13:20



video of it functioning

MPEG-4 Video - 17.64 MB - 09/19/2019 at 13:19


  • 2 × Arduino Uno
  • 2 × resistor -15k
  • 2 × 433Mhz transmitter
  • 2 × 433Mhz receiver

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Mikeb wrote 06/07/2021 at 15:44 point

What is the purpose of the transistor behind the transmitter? Is it some sort of pulldown? I was trying a similar project and couldn't get the pins 'quiet'. Would be interested to know the connections of that resistor.

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bogdanpaul86 wrote 06/24/2020 at 16:43 point

You say you transmit radio waves signals, yet in the code you mentioned the LDR in the RX side? So are you transmitting the Morse over visible light or radio waves?

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Bonez wrote 09/07/2020 at 14:51 point

radio, 433MHZ in this, but it could any method of transmitting data since what it is looking for is HIGH and LOW state combinations of specific time periods.

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Bonez wrote 01/11/2021 at 02:56 point


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Bonez wrote 09/19/2019 at 21:15 point

This would be cool... imagine a bunch of people using the same device once completed, create a  channelized system with every user having their call sign hard coded in the firmware for every transmission, one could create their own chat room with ham radio, independent of any grid based system. Even create an email system that could be accessed on command, specific to a particular call sign as an identifier.... i should learn more about ham radio, maybe someone already created it?

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Bonez wrote 09/19/2019 at 20:12 point

that is correct, unmodulated,  the duration of the transmitted signal form defines the data, if you were to listen to it on an SDR, it sounds like nothing.

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Dan Maloney wrote 09/19/2019 at 15:31 point

From your code, it looks like you're doing true CW - just transmitting unmodulated 433 MHz carrier. Correct? And how convenient that those NRF modules fall in the middle of the 70-cm ham band - at least in the US.

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