Search found 1664 matches

by arnaud
Fri Jul 20, 2018 7:13 am
Forum: Support
Topic: CF doesn't work after forcing deck drivers
Replies: 1
Views: 60

Re: CF doesn't work after forcing deck drivers

A corrupt memory error means that the memory has not been programmed and only firmware compiled in debug mode can use it (since firmware in release mode will disable all deck if it sees one with a programmed memory). So the fact that you need to set DEBUG=1 is normal. The two red leds seems to be an...
by arnaud
Fri Jul 20, 2018 7:08 am
Forum: Developer Discussions
Topic: Pin Usage (pin 2)
Replies: 1
Views: 67

Re: Pin Usage (pin 2)

I assume by pin2 you mean the pin RX2. The best to check if a pin is available is to look at the deck page on the wiki: https://wiki.bitcraze.io/projects:crazyflie2:expansionboards:index#deck_pin_allocation. According to it there should be no problem using pin2 with the flow. Did you measure the phy...
by arnaud
Thu Jul 05, 2018 11:39 am
Forum: Loco Positioning System
Topic: Using only the Loco Positioning nodes for positioning
Replies: 1
Views: 106

Re: Using only the Loco Positioning nodes for positioning

Yes you can but it requires you to calculate the position from raw ranging information. For TWR, you can set the node in TWR tag mode using the virtual serial port and it will output the range to 6 anchors on the same serial port. For TDoA, you need to set the node in sniffer mode, then there is a c...
by arnaud
Thu Jul 05, 2018 11:24 am
Forum: Loco Positioning System
Topic: client tab loco position read button result in all anchor's xyz return 0
Replies: 4
Views: 87

Re: client tab loco position read button result in all anchor's xyz return 0

Windows should work fine. This seems to be a new bug then. What version of everthing are you using (ie. client, crazyflie, anchors)?
by arnaud
Thu Jul 05, 2018 9:51 am
Forum: Loco Positioning System
Topic: Anchor count for TDoA v2/v3
Replies: 1
Views: 66

Re: Anchor count for TDoA v2/v3

TDoA works best when the Crazyflie is within the convex hull, ie. within the space formed by the anchor. This is why 8 anchors is better: it is very easy to make a 'cube' convex hull. With 6 you can make two triangles, one on top and one on bottom, and you will have a decent convex hull. So in short...
by arnaud
Thu Jul 05, 2018 9:40 am
Forum: Loco Positioning System
Topic: Can the Loco positioning deck be a node?
Replies: 1
Views: 66

Re: Can the Loco positioning deck be a node?

Yes it is physically possible but it will require some software work :). The algorithms in the node and Crazyflie are made in a quite similar way, so it should not be too hard to port code from one to another. One way might be to port the TDoA3 anchor code to the crazyflie firmware: https://github.c...
by arnaud
Thu Jul 05, 2018 9:36 am
Forum: Loco Positioning System
Topic: client tab loco position read button result in all anchor's xyz return 0
Replies: 4
Views: 87

Re: client tab loco position read button result in all anchor's xyz return 0

There is some instability in the memory subsystem that is used to read and write the anchor position from and to the Crazyflie. Sometime the memory subsystem gets blocked in the client in a bad state and the only way to get it back is to restart the client. Have you tried to restart both client and ...
by arnaud
Thu Jul 05, 2018 9:27 am
Forum: Autonomous flight
Topic: 4 Crazyflies, 1 radio and 4 paths using Flow deck
Replies: 1
Views: 98

Re: 4 Crazyflies, 1 radio and 4 paths using Flow deck

It is intended and possible. We have been playing with that a wile ago, you can see a video and the code in this blog post: https://www.bitcraze.io/2017/08/playing-with-the-flow-deck/ The limitation though is that with the flow you only get relative positioning and not absolute position, so the star...
by arnaud
Thu Jul 05, 2018 9:22 am
Forum: Autonomous flight
Topic: Autonomous flight not working properly
Replies: 1
Views: 75

Re: Autonomous flight not working properly

The first things would be to verify that you are getting a good position estimate from the system.You can display the Crazyflie position and orientation with rviz and move the Crazyflie by hand to check that the lps is working properly. One common problem is the startup position: are you switching y...
by arnaud
Wed Jul 04, 2018 12:59 pm
Forum: Loco Positioning System
Topic: How to use MORE THAN 8 anchors in TDoA 3?
Replies: 3
Views: 75

Re: How to use MORE THAN 8 anchors in TDoA 3?

No, unfortunately you currently have to choose either one or the other. Eventually we will either retire TDoA2 or add an automatic switch like we currently have for TWR/TDoA2.