Search found 2109 matches

by tobias
Fri Feb 26, 2021 8:40 am
Forum: Support
Topic: Crazyflie Bolt, one of the motor outputs is not working.
Replies: 4
Views: 361

Re: Crazyflie Bolt, one of the motor outputs is not working.

The connector contains VBAT - SIGNAL - GND so the signal can be accidentally shorted to either of these. Shorting to GND shouldn't be any problem but shorting to VBAT could be destructive. I think the GPIO is broke on the STM32F405. Please send us an email to support(at)bitcraze.io and we will help ...
by tobias
Tue Feb 23, 2021 3:32 pm
Forum: Support
Topic: good propeller test values
Replies: 6
Views: 645

Re: good propeller test values

Do you have two crazyflies so you could compare? We have seen some rare cases with bad IMU (BMI088), but it often has problems leaving the bias calibration state in the startup then. Have you tried logging the lighthouse angles or the position during the startup to see if there is a outlier or simil...
by tobias
Tue Feb 23, 2021 3:27 pm
Forum: Support
Topic: Crazyflie Bolt, one of the motor outputs is not working.
Replies: 4
Views: 361

Re: Crazyflie Bolt, one of the motor outputs is not working.

Could the signal have been shorted to the 12V? There is a 100ohm resistor to protect the output from shorting but for how long is hard to say. I did try and short it to 12.4V for a couple off seconds with no damage, but it was pulling ~50mA and I'm not sure how long it would last. Is the resistor st...
by tobias
Thu Feb 18, 2021 8:01 am
Forum: Support
Topic: good propeller test values
Replies: 6
Views: 645

Re: good propeller test values

Yes a more balanced system will fly better but for the Crazyflie to flip I believe the lighthouse system is receiving some outlier that makes the controller unstable. Improvements needed here, to make the lighthouse implementation more robust. The outlier could be caused by e.g. reflections of the s...
by tobias
Tue Feb 16, 2021 4:21 pm
Forum: Support
Topic: good propeller test values
Replies: 6
Views: 645

Re: good propeller test values

As for the the rotor values it is very unscientific and often values over 10 is needed to cause any problems, but lower is better.

Regarding the flipping problem, is this with the lighthouse? Perhaps it is related to this lighthouse reset problem?
by tobias
Thu Feb 11, 2021 9:08 am
Forum: Lighthouse positioning system
Topic: Voltage sag on old batteries resetting the LH deck
Replies: 4
Views: 503

Re: Voltage sag on old batteries resetting the LH deck

Glad to here you improved the situation. I will add a github ticket to implement this but as there are other platforms, such as the bolt, the implementation needs a bit more thinking so it works for all platforms. That is why there is currently a compile flag to activate the auto shutdown functional...
by tobias
Wed Feb 03, 2021 10:57 am
Forum: Lighthouse positioning system
Topic: Voltage sag on old batteries resetting the LH deck
Replies: 4
Views: 503

Re: Voltage sag on old batteries resetting the LH deck

This is a problem that we have been looking at a bit as well. We would like to detect bad batteries, connector or cables but we are not quite there yet. As with the propeller test there is also a battery test implemented in stabilizer.c (which should be moved somewhere else). It needs more work thou...
by tobias
Fri Jan 29, 2021 1:57 pm
Forum: General discussions
Topic: [Solved] Charging and Discharging unprotected batteries.
Replies: 4
Views: 381

Re: Charging unprotected batteries via USB.

This is fully untested but might work :-) /** * Shutdown system */ static void pmSystemShutdown(void) { #ifdef ACTIVATE_AUTO_SHUTDOWN SyslinkPacket slp; slp.type = SYSLINK_PM_ONOFF_SWITCHOFF; slp.length = 0; syslinkSendPacket(&slp); #endif } You might also want to change the auto off timeout if it w...
by tobias
Wed Jan 27, 2021 1:14 pm
Forum: General discussions
Topic: [Solved] Charging and Discharging unprotected batteries.
Replies: 4
Views: 381

Re: Charging unprotected batteries via USB.

The charger will work fine and is designed for LiPo and will cut off at 4.2V. The depletion though should perhaps be handled a bit better and is the most common risk I see. Something as simple as shutting off the system if the voltage has been lower then 2.9V for e.g. 3 seconds. This should preferab...
by tobias
Tue Jan 26, 2021 1:00 pm
Forum: Support
Topic: Front Right LED and Motor Not Working
Replies: 4
Views: 345

Re: Front Right LED and Motor Not Working

Hi! I agree, most likely a HW failure. It could be anything in the chain SW -> STM32F4 GPIO -> PCB trace -> resistor -> mosfet -> soldering -> connector -> motor As you have tested with different motor my best guess is the soldering of the resistor or mosfet or the mosfet itself that is bad. From th...