single ttl 3dr radio telemetry

[tonygoole]

Hi all I have just bought a single TTL 3DR radio telemetry setup.

I have plugged the air radio in to my quad via a cable into my APM2.5

and the ground radio into my computer using flight planner.


the computer recognises the ground radio and I have followed the instructions to set it up with MP.

when I try to connect nothing happens I have set com port 4 and baud rate at 57600 as suggested on  3DR robotics website.


The green led on the ground radio is just flashing green and the led on the air radio is green with the red led flickering.

ARRRRGGGH!! whats gone wrong, why wont they connect. have I missed something out or done something wrong????


please help X

[BrianS]

When in mission planner the 3DR Radio menu can you see both ends of the link.

[tonygoole]

hi brian,

No,  I only see the left side local.

[tonygoole]

Sorry I tell a lie. yes I see both sides but only the local side has data in it. I have copied data to remote but it only put half the data into the boxes.

[tonygoole]

[BrianS]

Have you got a FTDI-to-USB adapter to connect the remote end direct to your pc?

[tonygoole]

I just have the air radio into my apm2.5 and the ground end straight into the usb port on my computer.

[BrianS]

All i can think of is that the Net ID is different and with out a FTDI Usb acapter you cant connect the remote device to your machine to check the settings.

How far is the quad from the pc? i remember one of the radio setups would only connect within a meter or so until the antennas where changed.

[tonygoole]

Hi brian. Its inches from the pc. Is the fdti to usb same as ttl to usb?

[Gaza07]

Hi Tony have you tried swapping the rx / tx wires ? was the lead from the APM to the 3dr pre made or did you make it ?

[tonygoole]

hi Gaza

the lead was pre made, I bought it from build your xxx drone. would it still be worth while swapping the wires?

[BrianS]

A long as the remote end has power the radios should connect.

What make are the telemetry radios?

[Gaza07]

I would think if its pre made and for the APM to 3dr it should be correct, as some one else suggested maybe you should connect the air module to a FTDI adapter to check its functioning correctly,

There is a app for the modules you can get it here https://docs.google.com/file/d/0B4Pi876X3IIga1Z6NDUza040NnM/edit?usp=sharing

[tonygoole]

Thanks Gaza will have a look, yes a think i might have to invest in the FTDI cable.

[BrianS]

I would think if its pre made and for the APM to 3dr it should be correct, as some one else suggested maybe you should connect the air module to a FTDI adapter to check its functioning correctly,

There is a app for the modules you can get it here https://docs.google.com/file/d/0B4Pi876X3IIga1Z6NDUza040NnM/edit?usp=sharing

Mission planner has the got the 3DR Radio config built in.

[Hands0n]

Back to the wires. At the radio the centre two are TXD and RXD. Just make sure they are reversed at the APM plug. Mine are red yellow green black at the radio and red green yellow (blank) black at the APM.

Sent from my C6603 using Tapatalk 4

[tonygoole]

Great. can anyone recommend a ftdi connector to usb?

[tonygoole]

cheers hands on will check the cables.

[Hands0n]

Great. can anyone recommend a ftdi connector to usb?

Don';t spend a lot of money, these things are cheap as chips.  I have something like this, they can be quite expensive from UK suppliers for some silly reason ... http://www.ebay.co.uk/itm/FTDI-Basic-Breakout-Arduino-USB-TTL-6-PIN-3-3-5V-for-MWC-MultiWii-Lite-SE-/281108437391?pt=UK_ToysGames_RadioControlled_JN&hash=item41735e598f

You may also need a cable that will fit the TTL device (usually a black 4-pin large plug)  and the GPS (usually a tiny white 4-pin "Molex" connector).


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[BrianS]

This is the one that i use.

http://www.ebay.co.uk/itm/FTDI-Basic-Breakout-USB-TTL-6-PIN-3-3-5V-With-Free-USB-Cable-For-Arduino-/320907184616?pt=LH_DefaultDomain_0&hash=item4ab78f09e8

[DarrenG]

You don';t have quad connected to Mission Planner via USB do you?  Can';t have both 3DR Radio and USB to APM connected at same time.

[Gaza07]

Yea I kinda knew that but the stand alone one I find better   

Mission planner has the got the 3DR Radio config built in.

[tonygoole]

hi darren

no quads not connected, just telemetry

[tonygoole]

Ok got fpti lead and plugged it into air radio and pc. Clicking load setting and get told " failed to enter command mode" guessing the board if naff.

[BrianS]

Have you checked that the connections are correct?

Drivers installed correctly for the FTDI adapter? It should show up as a com port in device manager.

[tonygoole]

Hi brian. It shows up as com port 5 in mission planner Leads are plugged in properly. Will check device manager tho

[tonygoole]

everything looks ok on device manager.