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"I have installed a plug to separate the battery from APM. But when disconnecting the plug, the saved almanac information is lost. So on the fly field i must first connect USB to get a lock, than plug the backup battery in and than connect the lipo.…"
"I put ferrit coils to the Lipo + line, the UBEC (powering the in rail) and the one ESC ( powering the out rail). No change, no GPS-Lock."
"Steven, would you please measure if you have also voltage on the +/- pins of the input rail while backup battery is connected?
Thank you."
Thank you."
"The backup battery is feeding 1,4V back into the APM. Maybe a bad solder joint?"
"The 4-6 sats were outside, blue sky, without backup battery connected, only the APM off the copter, powered by USB. This is really not very good.
This evening I will check if the backup battery is feeding power back into the APM. Maybe the ground…"
This evening I will check if the backup battery is feeding power back into the APM. Maybe the ground…"
"Unfortunately, it is not working anymore. The battery is empty now. It was a brand new one with 3,3V, and now it has only 1,4V. I tested the diode, it is working and connected in the right direction. Any idea?
I also tested GPS accuracy with APM off…"
I also tested GPS accuracy with APM off…"
"Is anybody here having this GPS-Lock problem with original Diydrones ESCs and/or original PDB? Maybe it is the cause that some ESCs emit strong interefrences and others don´t."
"Vernon, if the solution of the problem is so simple, would you tell us what BEC / UBEC supply clean power? Maybe we can create a list with good parts and bad parts. But I think the solution is unfortunately not so simple."
"Doug, thank you very much for you offered help.
Here is a photo of my PDB and one with the APM over it. Space between them is about 1".
- It´s a DIY-frame.
- APM2 is the soldered version with GPS on the daughter board
- yes I have a voltmeter. The…"
Here is a photo of my PDB and one with the APM over it. Space between them is about 1".
- It´s a DIY-frame.
- APM2 is the soldered version with GPS on the daughter board
- yes I have a voltmeter. The…"
"Thank you Remi. I am glad that it worked for you, and it gives me hope
I have installed a backup battery to the GPS, but it is still not perfect. More here in this thread."
I have installed a backup battery to the GPS, but it is still not perfect. More here in this thread."
"I have installed the backup battery with a diode on +.
And IT IS WORKING.
Thank you Jake and Steven.
When fist time powering the APM, after some hours without power, than I got GPS-Lock in some minutes. But every time. Before, I got no Lock most…"
And IT IS WORKING.
Thank you Jake and Steven.
When fist time powering the APM, after some hours without power, than I got GPS-Lock in some minutes. But every time. Before, I got no Lock most…"
"Thank you very much Steven. This looks quite easy and may help a lot of people, having trouble with GPS lock.
I will try it with a non rechargeable battery, without switch but a diode on the vbat line. Will report as soon as it is working."
I will try it with a non rechargeable battery, without switch but a diode on the vbat line. Will report as soon as it is working."
"Thank you Jake, this may work. But what do you think of the idea to put a switch between the coin cell and the GPS and switch off the connection immediatelly after powering the APM? I think Steven Harsanyi did it this way, posted in this thread."
"I have the same issue, even with no RX onboard, only 6 ESCs (Hobbywing Skywalker 20A) each min. 2" away from the APM2. As soon as I connect my ESCs I have no Lock. I am trying and searching for weeks. Some day it is working quite good, but only for…"
Has anyone (successfully) installed a backup battery on the APM2s GPS and would be so kind to explain how it works?Thank you very much.
"Has anybody tested it with an older firmware than 2.6? Maybe it´s a software issue."
