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[Solved] How to monitor receiver pack voltage

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(@daniel_i)
Eminent Member Customer
Joined: 3 years ago
Posts: 16
Topic starter  

Hello all,

 

I have recently built my first nitro with Brain 2, powered from an BEC that provides 7.4 constant voltage.

Now I am receiving the BEC voltage in the telemetry but I am wondering if is there any way to monitor the 2s LIPO pack voltage that is powering the BEC?

 

Thanks in advance!

 


   
(@customercare)
Reputable Member Admin Registered
Joined: 6 years ago
Posts: 1118
 

To find out if there is a voltage sensor that can be used with your transmitter and receiver, we would need to know the brands and models of your TX and RX.

Even better if, as expected for service requests, you send us the configuration file of your flight controller.


   
(@daniel_i)
Eminent Member Customer
Joined: 3 years ago
Posts: 16
Topic starter  

Hi, I`m using Radiomaster TX16S with R-XSR receiver with F-Port opentx integration. 

I have attached the configuration file of my setup

 


   
(@customercare)
Reputable Member Admin Registered
Joined: 6 years ago
Posts: 1118
 

As far as we know, there are no sensors working on the F.Port bus (only the old sensors for Smart.Port bus and the new "ADV" sensors for F.Bus bus).

However, some of the FrSky receivers have an input usually named "AIN2" (Analogic Input) by which a voltage can be measured which is then telemetrically transmitted to the transmitter.


   
(@daniel_i)
Eminent Member Customer
Joined: 3 years ago
Posts: 16
Topic starter  

Hmm, ok.

But what if I connect https://www.frsky-rc.com/product/flvs-adv-w-o-screen/

on my R-XSR Smart Port? then I`m expecting to get voltage in telemetry from the receiver, right?


   
(@customercare)
Reputable Member Admin Registered
Joined: 6 years ago
Posts: 1118
 

As we have already explained to you and as is also stated in the FLVS ADV sensor instructions, this sensor (like all the other sensors), does not work when connected to the bus on which the F.Port protocol is traveling. Your receiver (like all other receivers), have only one Smart.Port connector and three different protocols can be set for this connector:

1) Smart.Port + S.Bus protocol (two separate connections for radio channels and telemetry, one connected to the CH3 connector (telemetry and receiver power) and the other connected to the SAT1 connector (radio channels) via the flight controller's MSH51645 adapter cable) with which both old sensors and new "ADV" sensors work when connected to the bus.

2) F.Port protocol (single connection to the CH3 connector of the flight controller) with which none of the commercially available external telemetry sensors work when connected to the bus.

3) F.Bus protocol (only connection to the CH3 connector of the flight controller) with which only the new "ADV" sensors work if connected to the bus.

Consequently if you want to use the FLVS ADV sensor, you will have to change in the flight controller and, through the transmitter, in the receiver the communication protocol from F.Port to Smart.Port + S.Bus using the MSH51645 adapter or from F.Port to F.Bus.


   
(@daniel_i)
Eminent Member Customer
Joined: 3 years ago
Posts: 16
Topic starter  

Thanks for detailed answer! Now it is clear.

In my case I was running Smart Port + S.Bus setup until recently when I "upgraded" to F. Port protocol so most likely I`ll get back to that connection for this purpose.

 

Thanks again!


   
(@daniel_i)
Eminent Member Customer
Joined: 3 years ago
Posts: 16
Topic starter  

One more clarification please, just to be sure I get this right

I`m doing the wiring like in the screenshot below.

image

So then in order to add FLVS ADV sensor I should do a Y cable to connect on the Smart port of the receiver right?


   
(@customercare)
Reputable Member Admin Registered
Joined: 6 years ago
Posts: 1118
 

In theory, yes, but with FrSky sensors this is not necessary because all FrSky sensors have two male connectors connected to each other in parallel and also come with two leads with two female connectors on the ends (at least this is what we saw in the sensors we purchased).

You then simply disconnect the receiver from the flight controller and connect it to one of the two sensor connectors. On the other sensor connector you connect one of the two supplied leads that you then go to connect the flight controller instead of the receiver.


   
(@daniel_i)
Eminent Member Customer
Joined: 3 years ago
Posts: 16
Topic starter  

Right, you are so helpful! thank you so much!


   
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