Problem: 3DR Radio modules don't connect at all!

Hello everyone,,,
I'm working on an Aerial Land Surveying System specified for area calculations, using a Quadcopter with APM 2.6 flight controller.


I'm done with almost everything with the system and I'm using Raspberry Pi 3 as my Ground Station.
I only have a problem in the 3DR Radios connection, they're not ever getting connected either using APM Planner (Running on Raspberry Pi 3), or Mission planner (Running on Windows 10), I always get the "No Heartbeat Packets Received" error although I'm choosing the correct port at 57600 baud rate. Also, I can establish the connection using USB.


I can Load Settings for both modules and they are typical. I also tried connecting the Air module to my laptop using FTDI board and uploaded a new firmware to it, nothing changed!
Green leds for both modules are quite stable, but, I recently noticed that the red led for the Air module flashes so weak, while the Ground module's one flashes regularly.


I unplug the USB cable while trying to connect the Radios, I tried using different firmware for Radios, Mission planner, and for the flight controller itself. All giving the same problem, I only once got the connection successful and it lasted 40 seconds before getting dropped (Red leds flashed regularly for both modules that time). Tx and Rx are connected to APM properly though.

I'm assuming that I have a hardware problem with my Air module as the red led flashes so weak. Does anyone know what's the matter or should I purchase a new one?
Both telemetry modules are new and they never had a flight.

Attached photos for both modules

Thanks all,,

13405447_852681394838065_1026104597_o.jpg

13410390_852681404838064_586874347_o.jpg

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • most of all, those are are not "3DR" radios, not even close.

    3DR is a company, and those are a some clone or similar product , most likely using the same HopeRF chip.  - it's even unusual for the clones to use full HM-TRP module.

    • Andre, I'm using genuine HM-TRP from HopeRF in my modems, but I'm PL, not CN :-)

      3DR_Radio_v3.jpg

      • Marcin, it's not your devices I were commenting, but the thread author's. :)

        • Yep, I know, that was a little piece of advertisement for good quality stuff ;-)

  • Switch Rx-Tx lines on air side

    • Tried doing so, still got the same problem.
      I'm now connecting Radio Tx to APM Rx and Radio Rx to APM Tx
      • Disconnect 3DR radio from APM, power up radio with different source, short Rx with Tx on air module, open terminal program on PC and try to send some text via it. If it will show back on terminal screen - problem is not in radio link.

        • Do you mean connecting the air module to PC using FTDI then doing so?

          • No, connect ground module to PC as usual. Then power up air module with APM unconnected and Rx-Tx shorted, so radiolink should loop your transmission.

            • I received data for only 2 seconds and then the connection got dropped again. The air module red led still flashes weakly whenever I send data, while the ground module flashes regularly.

              Attached a photo of X-CTU terminal while doing the above process, I only got the data received back for 2 seconds at the beginning.

              I tried powering the telemetry using 5v supply from the APM auxiliary pins, and from an external power supply, nothing changed. 

              Capture1.JPG

This reply was deleted.

Activity

DIY Robocars via Twitter
23 hours ago
DIY Robocars via Twitter
RT @SmallpixelCar: @a1k0n @diyrobocars I learned from this. This is my speed profile. Looks like I am too conservative on the right side of…
yesterday
DIY Robocars via Twitter
RT @a1k0n: @SmallpixelCar @diyrobocars Dot color is speed; brighter is faster. Yeah, it has less room to explore in the tighter part, and t…
yesterday
DIY Robocars via Twitter
RT @a1k0n: I'm gonna try to do proper offline reinforcement learning for @diyrobocars and throw away all my manual parameter tuning for the…
yesterday
DIY Robocars via Twitter
RT @circuitlaunch: DIY Robocars & Brazilian BBQ - Sat 10/1. Our track combines hairpin curves with an intersection for max danger. Take tha…
Thursday
DIY Robocars via Twitter
RT @SmallpixelCar: Had an great test today on @RAMS_RC_Club track. However the car starts to drift at 40mph. Some experts recommended to ch…
Sep 11
DIY Robocars via Twitter
RT @gclue_akira: 世界最速 チームtamiyaのaiカー https://t.co/1Qq2zOeftG
Sep 10
DIY Robocars via Twitter
RT @DanielChiaJH: Always a good time working on my @diyrobocars car at @circuitlaunch. Still got some work to do if I’m to beat @a1k0n howe…
Sep 10
DIY Robocars via Twitter
RT @SmallpixelCar: My new speed profile for @RAMS_RC_Club track https://t.co/RtLb7TcgIJ
Sep 10
DIY Robocars via Twitter
RT @SmallpixelCar: Practiced at @RAMS_RC_Club today with my new @ARRMARC car https://t.co/AEu2hCx89T
Aug 28
DIY Robocars via Twitter
Aug 24
DIY Robocars via Twitter
RT @gclue_akira: 柏の葉で走行させてるjetracerの中身 #instantNeRF #jetracer https://t.co/giVvuE4hP7
Jul 4
DIY Robocars via Twitter
Cool web-based self-driving simulator. Click save when the AI does the right thing https://github.com/pncsoares/self-driving-car
Jul 4
DIY Robocars via Twitter
RT @donkey_car: Human-scale Donkey Car! Hope this makes it to a @diyrobocars race https://www.youtube.com/watch?v=ZMaf031U8jg
Jun 25
DIY Robocars via Twitter
Jun 25
DIY Robocars via Twitter
Jun 16
More…