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Front Right LED and Motor Not Working

Posted: Thu Jan 21, 2021 4:46 pm
by crazyfordrones

I've been having some issues with one of the Crazyflie's I own. I have a lighthouse deck and a Qi charging deck attached. Last night, I was having some boot up issues where the crazyflie would not spin it's propellers upon turning it on, and the front right LED was flashing 5 short pulses (indicating self test failure). I was able to reflash the crazyflie and this problem went away. However, now upon bootup, all propellers spin except the front right one. The LED on the front right is also not turning on at all. Are there any steps I can take to figure out what the problem is?

Re: Front Right LED and Motor Not Working

Posted: Thu Jan 21, 2021 4:48 pm
by crazyfordrones
Some follow up information:

I tried switching out the motor in case the motor was failing, but this did not work.

The crazyflie client shows no errors either:

Code: Select all

SYS: Crazyflie 2.1 is up and running!
SYS: Build 43:7cd20b464fff (2020.06 +43) MODIFIED
SYS: I am 0x20383347344D5008002C0045 and I have 1024KB of flash!
CFGBLK: v1, verification [OK]
DECK_INFO: Warning! No driver found for deck.
DECK_CORE: 2 deck(s) found
DECK_CORE: Calling INIT on driver bcLighthouse4 for deck 0
IMU: BMI088 Gyro I2C connection [OK].
IMU: BMI088 Accel I2C connection [OK]
IMU: BMP388 I2C connection [OK]
ESTIMATOR: Using Kalman (2) estimator
CONTROLLER: Using PID (1) controller
MTR-DRV: Using brushed motor driver
EEPROM: I2C connection [OK].
IMU: BMI088 gyro self-test [OK]
STAB: Wait for sensor calibration...
SYS: FreeLHFL: Lighthouse bootloader version: 2
 heap: 11904 bytes
STAB: Ready to fly.
LHFL: Firmware version 5 verified, booting deck!
STAB: Acc noise floor variance X+Y:0.003764, (Z:0.002456)
STAB: Motor M1 variance X+Y:0.003298 (Z:0.002388)
STAB: Motor M2 variance X+Y:1.060265 (Z:5.927345)
STAB: Motor M3 variance X+Y:0.821081 (Z:0.074081)
STAB: Motor M4 variance X+Y:0.671533 (Z:0.053863)
From this, it seems as though the crazyflie thinks that the motor is connected and spinning. If I disconnect the front right motor, it is able to detect this.

Re: Front Right LED and Motor Not Working

Posted: Fri Jan 22, 2021 7:57 am
by kimberly
Seems like an hardware failure, where a mosfet or a resistor is broken/burned. Could you send us a highres picture of the electronics and the connector of the front right leg of the crazyflie?

Re: Front Right LED and Motor Not Working

Posted: Mon Jan 25, 2021 2:28 am
by crazyfordrones
Hello Kimberly!

Thank you for the quick response. I'm attaching some photos of the crazyflie. The issue seems to be on the arm of M1. Nothing seems visually wrong, so I'm unsure what to do next.

Re: Front Right LED and Motor Not Working

Posted: Tue Jan 26, 2021 1:00 pm
by tobias

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 the pictures I can't see any bad soldering. You could try and check for yourself. It is these components:
If nothing easy found please send us an email to support at and we will help you out with a replacement.