Hello

at the end i have tested it plugin the battery (using also the smokestopper in the middle) and from the xt60 there was the output value from a 4s in storage, so 15.40 if i don't rember bad and from the jst 2.0 there was an output of 3.33v so i think that BEC work well.

so it should work now, someone think that at 3.30v the gps will be slower to take sats ?

another questions is, the costance of power that the drone will receive during a fly will be the same as directly connected with the battery and without that extra cable with the 3.33v bec i made ?

bye

I have tested the solution where i should fly with the 1s lipo connected to the drone to give power to the gps module while i fly the Wizard with the 4s connected too of course...but i have noticed that the gps is not reconised by the FC if i fly while it receive power by the 1s lipo 

what i do:

1) give power to the gps using the 1s lipo even before connect the 4s lipo, for an hot start;

2) if i plug the 4s lipo while the gps module is powered by the 1s the system don't recognize the presence of gps soldered on the FC, in fact any information about the gps disapear from the top of the screen: 

3) to see the gps information again i have to directly connect the gps module to the power output from the FC and not to the 1s lipo ! 


is normal that the FC don't read the data of the gps if no device is requiring power from that pad because as said the module is powered with the 1s module ?

i hope to have explained well the situation, my drone is been configurated that :

- data cables of gps are directly soldered on the FC pads;
- while the gps +/- cables that leave the module are soldered to a female JST ph2.0 connector,
- the FC pads is soldered to a male JST ph 2.0 connectors 

i plug between eachother these two connectors when i want to give power to the gps module using the power of the FC ...while when i want to give power to the gps using the lipo i plug the lipo 1s to the female connector that go directly to the module;

Call me confused.   BUT...did you try that little connector with the BEC?

You plug the 4S battery into the connector and the GPS into the connector,
then wait, then plug the connector into the power lead on the FC ??  

Also, assuming that the GPS data leads are always connected to the FC.

Using 2 different batteries shouldn't make any difference but, maybe it does.

(29-Dec-2022, 12:39 AM)iFly4rotors Wrote: Call me confused.   BUT...did you try that little connector with the BEC?

You plug the 4S battery into the connector and the GPS into the connector,
then wait, then plug the connector into the power lead on the FC ??  

Also, assuming that the GPS data leads are always connected to the FC.

Using 2 different batteries shouldn't make any difference but, maybe it does.

Hello )

I have made that connector with the bec and I have tested if it work but I have never tested on the field...I'm a bit uncomfortable with it because is too long and exposed at the tail of the drone...so I was hoping to can use the alternative method of giving always power to the gps using a 1s lipo charged at 3.85v, a bit less comfortable because don't require much space that 1s...but unfortunately betaflight don't recognise the GPS module if the GPS module is powered by that external 1s battery ...


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Now maybe that rerequest will be a bit tricky considering about what we are talking, but would be funny to do, I will try to explain:

1)GPS would be always connected to the GPS board with positive and negative too;

2) there would be also the 1s battery that give power to the GPS when the FC is off (before I plug the 4s lipo) ;

3) there should be some mini device, but looks complicate that when I plug in the 4s lipo it immediately close the power received by the 1s lipo and switch to the power that receive from the Flight control...could it be possible to realise ?

Hi Rosssiiii,

You know, it might be worth a try to at least see if you adapter works and you get 
the GPS information in the OSD. It might not be optimal, but worth a try anyway. 
You could also make another connector that fits the quad the way that you want. 
Just saynin'

Can you show a picture of your wiring? Do you have a common ground to the FC along with TX and RX?

(29-Dec-2022, 04:56 PM)iFly4rotors Wrote: Hi Rosssiiii,

You know, it might be worth a try to at least see if you adapter works and you get 
the GPS information in the OSD. It might not be optimal, but worth a try anyway. 
You could also make another connector that fits the quad the way that you want. 
Just saynin'

Is sad that GPS unit is not recognised by the flight controller if I don't give power to it using the specific 5v pad !

The GPS go on also with lower voltage like 3.85v of the 1s lipo but don't know maybe is not enough to let the module communicate well with the flight controller of the drone that require 5v to work?

(29-Dec-2022, 04:56 PM)iFly4rotors Wrote: Hi Rosssiiii,

You know, it might be worth a try to at least see if you adapter works and you get 
the GPS information in the OSD. It might not be optimal, but worth a try anyway. 
You could also make another connector that fits the quad the way that you want. 
Just saynin'

(30-Dec-2022, 09:53 AM)V-22 Wrote: Can you show a picture of your wiring? Do you have a common ground to the FC along with TX and RX?

that is a picture i took some times ago when i have added to the drone:
https://i.imgur.com/YZXChf8.jpg
https://i.imgur.com/q5yUYvK.jpg

it work well but is slow in sat fix, maybe is the model to be slow but when do it work fine;

I have did some test to watch in betaflight when is show in yellow the GPS indicator https://i.imgur.com/GbZXrcs.png it means is reconised by betaflight;

Betaflight and my FC reconise the gps only:

-if i plug the 4s lipo and the gps module receive power from the 5v pad on the FC ;

-if i plug the 4s and i give power to the gps and to the FC in the exactly same moment; 

in any other cases when you are in BF, even if the gps receive power its not indicated as there is a GPS on the drone !

that mean that there is not way for me to do an hot start in this way   i could also try to give power to the gps using the balance cable of the 4s lipo with a 5v BEC but i think that also in this case, if i give power to the gps first and later i connect the lipo i will not be able to read the gps data

The fact is that i can have hot start only if i plug the 1s lipo in advance when the drone is still on the ground, but it do the sat fix only when i'm also on the air with the 4s lipo, in that case i will not have gps information.... at the next fly in the same place during the same day i can start always with the 4s because it will fix the sats and bf reads data;

I would suggest trying the adapter that you made.

Don't worry about length or how it fits on the quad.
Right now, you are just testing it...proof of concept.

I would test it myself, but right now I have REAL Life priorities to attend to, 
so I haven't been doing much with my FPV hobby; especially building and testing.

What GPS is it? Do you have auto-config and auto-baud enabled under GPS options in Betaflight? If the GPS does not have flash, it needs to be configured by Betaflight on every boot. If the FC is booting before you power the GPS, it might not be properly sending the configuration commands because it is not receiving a response from the GPS.

Noise on the 5v line would be the other factor I would look at preventing a fix.

(31-Dec-2022, 05:22 PM)iFly4rotors Wrote: I would suggest trying the adapter that you made.

Don't worry about length or how it fits on the quad.
Right now, you are just testing it...proof of concept.

I would test it myself, but right now I have REAL Life priorities to attend to, 
so I haven't been doing much with my FPV hobby; especially building and testing.

Yes i have tested it and Betaflight/FC recognise the gps only if i plug the 4s and i give power to the gps and to the FC in the exactly same moment; 

if i plug first the JST to give 3v power to the gps and later i plug the 4s lipo to give power to entire system, it happens that Gps unit is not recognised ... same when i try to give power to the gps with the 1s and later when i plug the 4s betaflight don't read the GPS module.

GPS module is read by betaflight/FC only when i give power to same moment to them.
 

(31-Dec-2022, 07:39 PM)V-22 Wrote: What GPS is it? Do you have auto-config and auto-baud enabled under GPS options in Betaflight? If the GPS does not have flash, it needs to be configured by Betaflight on every boot. If the FC is booting before you power the GPS, it might not be properly sending the configuration commands because it is not receiving a response from the GPS.

Noise on the 5v line would be the other factor I would look at preventing a fix.

The gps is a BN 220;

and is configurated like that : https://i.imgur.com/ntXLRqy.png

it work fine when do the sat fix and is necessary do an hot start every time i change place where to fly or if i go to fly the day later for example.

the opposite usually happens, for an hot start i give first power to the gps an later to the FC and in that case the gps module is not recognised by the FC !

What do you mean for noise on the 5v line ?


I wish to all of you an happy new Year