TDoA anchors losing power

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sali0
Beginner
Posts: 7
Joined: Wed Oct 19, 2016 7:53 pm

TDoA anchors losing power

Postby sali0 » Thu Feb 16, 2017 10:25 pm

Hello all,
My team and I recently got our TDoA set up, however we are running into a few issues. We had tested extensively with the ToA configuration, and we got our system running properly. However, after flashing to TDoA, when turning all of the anchors on, the anchors start communicating but soon turn off randomly, about 1 minute after starting all of them up. We have all 8 anchors up, but are unsure of what is going on with the power.

Seeing as the Bitcraze team has gotten TDoA working properly, our probable issues are from what we can tell either the power banks that we have, or some issue with the clock syncing in the TDoA code. I am leaning towards the second issue, as there were no power issues during ToA, but I still do not know. I will also try to get some recording of what is going on. Any help is appreciated. Thank you.



NateTheAverage
Beginner
Posts: 8
Joined: Thu Sep 29, 2016 10:40 am

Re: TDoA anchors losing power

Postby NateTheAverage » Sat Feb 18, 2017 12:40 am

Sorry its not any help but I have TDoA set, with the current firmware flashed and get 6 hours out of 2,000 mh batteries. I haven't ran in to any issue turning off anchors.

arnaud
Bitcraze
Posts: 750
Joined: Tue Feb 06, 2007 12:36 pm

Re: TDoA anchors losing power

Postby arnaud » Mon Feb 20, 2017 3:20 pm

Hi, this is actually very likely to be a problem with your USB power pack, we have seen the same behavior with some of ours.

The problem is that the TDoA mode does not consume enough power(!), the usb power bank will think that whatever connected to it is charged or disconnected and will switch itself off. The reason why TDoA does consume less than TWR (ToA) is because the TWR anchors are always listening and so cumsume more than 100mA continiously. The TDoA anchor are synchronized together and only listen/send during timeslots, this reduces greatly the power consumption.

I have usually fixed the problem by connecting 2 anchors per power bank, this way the power consumption is enough to keep it on. We also have a different kind of powerbank (smaller one, like 2000mAh) that are good for 1 anchor.


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