Hi all!


I am going step by step on my first build. I would like to set a low battery drone warning on my TBS Mambo radio, to avoid damaging tha battery or crashing the drone.

I guess that a low drone battery warning is something standard, and more or less trivial to to set in a modern radio, but I do not know how to do it?
I checked the manual, looked for tutorials and went through the menu, but I cannot find a way to do it.
I found a warning option on the radio menu that serves to adjust the warning volume, but not to set a warning cause.

Any advice would be greatly appreciated!

Oriol

You can use the procedure documented in Oscar's article at the link below. It is demonstrated using a different transmitter but it is the same procedure on the Mambo. Just remember to use RxBt sensor wherever VFAS is mentioned in the article...

https://oscarliang.com/taranis-logical-s...tage-alarm

Thanks a lot SnowLeopardFPV, I really appreciate it!

I will carefully read Oscar Liang tutorial and apply it to my Mambo radio.
I hope that soon I will have everything that I need, to enjoy flying my DIY drone.

Cheers,

Oriol

Hi Snowleopard and everyone!

I checked Oscar Liang's article you have provided me and tried to set his low level battery function into the Mambo, but it does not work.
There is a logical switches window, but although I can enter a function A<B but next, the RxBt option it is not available on the Mambo radio display parameters.

I have send an enquiry to TBS about how to program a low level battery warning. They have provided me a link with a tutorial explaining how to set a low level battery function on OpenTX. I have downloaded OpenTX, but the Mambo radio is not supported yet, it seems that the next update will work.

There is FreedomTx for TBS agent, intended to program the radio through the PC. I updated the firmware of the receiver, but when I plug it the program says the device has no configurable settings.

Any advice would be greatly appreciated, thanks!

Oriol

FreedomTX is just a fork of OpenTX so the setup and configuration is exactly the same under FreedomTX as it is in OpenTX. It's just done on a smaller screen. So if you are following Oscar's article to the letter then I'm not sure why you can't get it to work.

You could try posting some screenshots of the Logical Switches and Special Functions pages of your Mambo back here and we can try to figure out what you might have done wrong.

FreedomTX has been merged into OpenTX 2.3.15 but no ETA on the release date. This should make life simpler for TBS radio users.

Hi Snowleopard and Kafie1980!

I understand, I can program a low level battery warning directly on the screen of the Mambo radio.

On the below tutorial link, that TBS has provided me about how to set the parameters. It seems that all can be done without using an RxBt option, which I cannot find scrolling down through the parameters.

If I follow the tutorial, I enter the Logical Switch page and I can set, l¡ke in Oscar Liang's article, the Func option to a<x.
Then according to the video, I have to find out the telemetry sensor that reads the Voltage, because there is no RxBt option.
I am unable to find out which telemetry sensor is?

I guess that I have to refer to the Nano tracer RX options and find out the correct output.
There are only four options: channel 1, channel 2, 5v IN, Ground.
I cannot figure out, if the correct one is channel 1 or channel 2?
If I select any of those options, I can only write a whole number on the V2 parameter.
Scrolling down the V1 option there is an SG option, picture below, which allows to write a number with decimals on the V2 option.

OTOH I can not figure out which parameter select on the AND switch option, so that the alarm warning only sounds when the drone is armed?
There is a lot of options, but it is not clear which one corresponds to the A switch, that serves to arm the drone?

It is very confusing to set the parameters without a manual, that does not provide information about the available different options in the menu.
The Mambo manual just tells, that logical swittches serve to compare values and combine different functions without ellaborating much further.

As you can see I am lost, I do not know how to select the right setting?
Perhaps I need to refer to OpenTX for details?

Thanks a lot for your inputs, it is really helpful and amazing!

Without this forum my DIY drone would be grounded.

Oriol

I will suggest is to (on your Mambo radio) re-discover sensors on the Telemetry page with your receiver and quad powered up.

This should show you the RxBt sensor (its 4th in the list of sensors).

Also make sure you have the TELEMETRY feature switched on in Betaflight, otherwise you won't get some of the sensors showing up on your transmitter. You can either switch that on in the Configuration tab of Betaflight Configurator, or run the following commands in the CLI tab...


As long as you have the Crossfire Nano RX wired up correctly to the FC (CH1 to an RX pad on the FC and CH2 to the TX pad on the FC for the same UART) then you should then be able to discover all of the sensors on the Mambo.

Setting up logical switches and special functions is way easier in OpenTX Companion than trying to do it on a small screen, so once you have got the RxBt sensor discovered, if you are able to wait until OpenTX 2.3.15 has been released which supports the Mambo then you will have a much easier time setting all of this up.

Hi Kafie1980 and Sonwleopard!

I connected the Quad to Betaflight to make sure that telemetry was set on, then I connected the radio with the quad on.

On the Telemetry page I discovered an RxBt sensor! It was the 14th on the list of sensors.
On the V1 list of the Logical switch page I found an RxBt+ and an RxBt- option, I picked RxBt+. I do not know what is the difference between the RxBt+ ant RxBt- options?
On the AND switch option I selected LO2, same as Oscar Liang's tutorial.
I selected duration as NULL and Delay as 0,5, like on the video tutorial.

I will try the radio and the drone asap and see if the radio warning finally works. I also have, thanks to you, the display of the goggles working so that I can land before it is too late. I try to read, whenever i have some spare time, Oscar Liang's cool tutorial about Betaflight so that I can become familiar with all the settings.

Thanks a bunch for your kind help!!

Oriol

(02-Oct-2021, 07:32 PM)oriol Wrote: On the V1 list of the Logical switch page I found an RxBt+ and an RxBt- option, I picked RxBt+. I do not know what is the difference between the RxBt+ ant RxBt- options?

You need to use the plain "RxBt" sensor (without a + or - after it).

• RxBt is the actual current battery voltage.
  
• Rxbt+ is the highest battery peak voltage that was seen during the flight.
  
• RxBt- is the lowest battery peak voltage that was seen during the flight.
  

Hi SnowleopardFPV!

I just fixed the parameter on the radio to RxBt.
I am a bit scared of trying the drone at home because it is very small, but I will try the radio outside as soon as the weather improves a bit.

Thanks for your help!

Oriol