3DR radio

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I am trying to set up the FPV telemetry radios (Air and Ground Module 433MHz).

  1. I have connected the Ground module to my laptop (USB) and air module to Raspberry Pi 4 UART pins.
  2. Using Mission planner I was able to configure the settings of the radios. I can confirm the connection by the green solid led light on both the modules.
  3. I use the mission planner terminal to send the data from ground
    module to air module and test the connection.When I send some command (e.g, help), I can see red led light blinking on both air and ground module indicating data is received.

Now, I need to capture the data sent by the ground module and display it on raspberry pi terminal. However, I am unable to achieve this activity. I have searched a lot on this task but could find nothing. It would be really helpful if someone could help me in this regard with any relevant websites/codes available, or steps to solve the issue.


  • Hi @TheLazy, Ah, let me see. Let me first summarize you situation. (1) Your radios are configured and connected, and testing sending/receiving commands looks OK, as indicated by the green and red LEDs. (2) Now suppose the ground module sends a text message “HELP <new line> “, and air module receives the message OK. (3) You problem now is how can Rpi connected to the air module display the received text message “Help <newline>”, in the terminal window. Please confirm if I understand you situation and problem correctly. – tlfong01 1 hour ago    
  • And can you give me the web links to your radios, any user guide or tutorials you are following, like the following? (1) AliExpress 3DR 500MW Radio Telemetry 433Mhz 915Mhz Air and Ground Data Transmission Module for APM Pixhawk Flight Control FPV – US$25, aliexpress.com/i/32799841052.html (2) 3DR V2 Quick Start Guide, 3dr.com/wp-content/uploads/2013/10/3DR-Radio-V2-doc1.pdf. – tlfong01 1 hour ago   
  • Hi @tlfong01, Your understanding is correct. I want to display the message <HELP> sent from ground module (using mission planner) on the Raspberry pi terminal at air module end. The 1st web link shared by you is the radios I am using. I am not following any specific tutorial/ guide. Its just bits and pieces from the internet which we followed and made upto basic stage of connecting the radios and verifying it. – TheLazy 35 mins ago

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