Search found 9 matches

by Sun
Sat Aug 18, 2018 2:29 pm
Forum: Loco Positioning System
Topic: Bad Positioning Effect in Some Area
Replies: 4
Views: 842

Re: Bad Positioning Effect in Some Area

Hi arix, The node I use is a bit different from the one that can be bought from crazyflie shop. I use dwm1000 qfn chip on the PCB board so I can replace the antenna. The change of antenna can enhance the positioning effect but the drone should be able to hover using worse antenna. I think there shou...
by Sun
Wed Aug 15, 2018 11:28 am
Forum: Loco Positioning System
Topic: Bad Positioning Effect in Some Area
Replies: 4
Views: 842

Re: Bad Positioning Effect in Some Area

After some test, I think I solved the problem. Mainly I have done two things. One is flashing the newest firmware to the drone, which gives better control of the drone. The other is replacing antennas of all the lps anchors by better ones. This makes the plane hover perfectly at every position in th...
by Sun
Tue Aug 07, 2018 5:02 am
Forum: Loco Positioning System
Topic: Bad Positioning Effect in Some Area
Replies: 4
Views: 842

Bad Positioning Effect in Some Area

Hi crazyfliers, I establish lps system using 6 anchors in TWR mode. I let the drone fly through four points by autononousSequency.py. The sequence I tested is (1.0,1.0,1.0) -> (2.5, 1.0, 1.0) -> (2.5, 2.5, 1.0) -> (1.0, 2.5, 1.0) in unit meters. The locating performance of the drone is excellent at ...
by Sun
Sat Aug 04, 2018 3:48 pm
Forum: Bitcraze
Topic: Cannot Communicate with Crazyradio after Flashing NRF51822
Replies: 5
Views: 844

Re: Cannot Communicate with Crazyradio after Flashing NRF51822

Here is a screenshot showing the last step of make factory_reset.
by Sun
Sat Aug 04, 2018 3:46 pm
Forum: Bitcraze
Topic: Cannot Communicate with Crazyradio after Flashing NRF51822
Replies: 5
Views: 844

Re: Cannot Communicate with Crazyradio after Flashing NRF51822

Hi arnaud, The reason why all the MCUs are brand new is that I remade the PCB board according to the crazyflie schematic documents to add extra functions and change the shape of the drone. In my trials before, LED M3 never blinks so I need to flash the crazyflie2-stm-bootloader firmware as you said....
by Sun
Tue Jul 31, 2018 4:28 pm
Forum: Bitcraze
Topic: Cannot Communicate with Crazyradio after Flashing NRF51822
Replies: 5
Views: 844

Re: Cannot Communicate with Crazyradio after Flashing NRF51822

The pictures shows the error information when using make cload command.
by Sun
Tue Jul 31, 2018 4:27 pm
Forum: Bitcraze
Topic: Cannot Communicate with Crazyradio after Flashing NRF51822
Replies: 5
Views: 844

Cannot Communicate with Crazyradio after Flashing NRF51822

Hi, I flashed the firmware to a brand new NRF51822 by the command 'make factory_reset'. All of the MCUs in my drone are brand new, meaning no programs or no correct programs have been flashed to them before. The method of flashing is soldering STlink cable to four NRF debug pins on the drone and fla...
by Sun
Thu Jun 07, 2018 5:56 pm
Forum: Loco Positioning System
Topic: The drone drifts when flying using position hold mode
Replies: 3
Views: 666

Re: The drone drifts when flying using position hold mode

Thanks for your reply, tobias. We will try to use python script or ROS to control the position of the plane later. However the screenshot of the client above shows the target pitch and roll are exactly zero. Doesn't that mean the inputs are zero?
by Sun
Wed Jun 06, 2018 3:48 pm
Forum: Loco Positioning System
Topic: The drone drifts when flying using position hold mode
Replies: 3
Views: 666

The drone drifts when flying using position hold mode

Hello, We are trying to fly the drone using UWB loco positioning system, but the effect is far from expectation. We use a joystick to control the drone by cfclient. The firmware downloaded to the drone is in VM2018.01 with forced DWM1000deck support and TWR ranging support. The location of the drone...