If you happen to’ve ever confronted the irritating difficulty of your FPV drone refusing to arm, you’re in the appropriate place. I’m right here to information you thru troubleshooting and fixing this drawback, particularly in case your drone makes use of Betaflight firmware. By understanding what prevents a drone from arming and studying the way to diagnose and repair these points, you’ll be again within the air very quickly.
New to Betaflight? No worries—right here’s a tutorial to get you began on setting it up for the primary time: https://oscarliang.com/betaflight-firmware-setup/
The First Issues to Test
Alright, let’s dive into the primary steps to diagnose why your drone isn’t arming.
Unplugging USB Cable
Betaflight has a security function the place your motors gained’t spin up if the flight controller is linked to the configurator. So, disconnect the USB and provides it one other go.
Radio Receiver Test
Guarantee your radio receiver is certain and dealing accurately in Betaflight. Head over to the receiver tab to see if the channel responses match your stick actions accurately. Oh, and be sure to’ve received the most recent Betaflight configurator downloaded: https://oscarliang.com/download-betaflight-configurator/.
Arm Mode Task
Did you assign a change in your radio for ARM mode? It ought to gentle up yellow when activated, signaling every little thing’s set accurately. Unsure how to try this? See my tutorial on establishing Arm change: https://oscarliang.com/betaflight-modes/#How-to-Setup-Arm-Swap
Nonetheless no luck? Let’s dig a bit deeper.
The right way to Test for Arming Points in Betaflight
OSD
If you happen to’ve received Betaflight OSD, allow “Warnings” in your display with “Arming Disabled” chosen. It’ll provide you with clue on what’s stopping the drone from arming.
You don’t have Betaflight OSD? There are different methods to examine for the “Arming Disable Flag” in Betaflight, let me clarify.
Betaflight Configurator
In case you have entry to a pc, you possibly can simply examine the Arming Disable Flag within the Setup Tab within the Betaflight configurator.
CLI
Alternatively, you possibly can examine within the CLI by coming into the command “standing”, the final line is the record of arming prevention flags.
Additional Studying: The right way to use CLI in Betaflight?
Buzzer Beeping
If you happen to don’t have a pc, however your quad has a buzzer, the beeping also needs to point out the disarm flags. Right here’s the way to decipher the beeping sample:
- 5 brief beeps for simply consideration, which will be ignored
- Numerous lengthy beeps
- Numerous brief beeps with lengthy intervals
Every lengthy beep represents 5, whereas every brief beep represents 1. The ultimate flag quantity will be calculated as 5 x <the variety of lengthy beeps> + <the variety of brief beeps>.
For instance:
- 0 lengthy beep and a pair of brief beeps = 2
- 1 lengthy beep and three brief beeps = 8
- 2 lengthy beeps + 0 brief beeps = 10
Arming Prevention Flags Lookup Desk
When you’ve discovered the arming disabled flag numbers or names, match them with this useful desk to decode the problem. The data is from the Betaflight wiki.
| Title | Description | Beep code | Required Actions |
| NOGYRO | A gyro was not detected | 1 | You’ll have a {hardware} failure, if a earlier firmware model works then it could be a firmware difficulty. Otherwise you may need flashed a flawed goal. |
| FAILSAFE | Failsafe is lively | 2 | Rectify the failure situation and check out once more. |
| RXLOSS(1) or RX_FAILSAFE | No legitimate receiver sign is detected | 3 | Your receiver is both defective or has no hyperlink to the transmitter. |
| BADRX(1) | Your receiver has simply recovered from receiver failsafe however the arm change is on | 4 | Swap the arm change off. |
| BOXFAILSAFE | The ‘FAILSAFE’ change was activated | 5 | See FAILSAFE |
| RUNAWAY | Runway Takeoff Prevention has been triggered | 6 | Disarm to clear this situation. |
| CRASH | Crash Restoration has been triggered | 7 | Disarm to clear this situation. |
| THROTTLE | Throttle channel is simply too excessive | 8 | Decrease throttle beneath min_check. |
| ANGLE | Craft will not be stage (sufficient) | 9 | Degree craft to inside small_angle levels (default 25). |
| BOOTGRACE | Arming too quickly after energy on | 10 | Wait till pwr_on_arm_grace seconds (default 5) have elapsed. |
| NOPREARM | Prearm change will not be activated or prearm has not been toggled after disarm | 11 | Toggle the prearm change. |
| LOAD | System load is simply too excessive for protected flight | 12 | Revisit configuration and disable options. |
| CALIB | Sensor calibration remains to be ongoing | 13 | Watch for sensor calibration to finish. |
| CLI | CLI is lively | 14 | Exit the CLI. |
| CMS | CMS (config menu) is Lively – over OSD or different show | 15 | Exit the CMS (or OSD menu). |
| OSD | OSD menu is lively | Exit OSD menu. | |
| BST | A Black Sheep Telemetry machine (TBS Core Professional for instance) disarmed and is stopping arming | 16 | Consult with the guide on your {hardware}. |
| MSP | MSP connection is lively, most likely by way of Betaflight Configurator | 17 | Terminate the Betaflight Configurator connection (disconnect). |
| PARALYZE | Paralyze mode has been activated | 18 | Energy cycle/reset FC board. |
| GPS | GPS rescue mode is configured however required variety of satellites has not been fastened | 19 | Watch for GPS repair, allow arming with out GPS repair, or disable GPS rescue mode. |
| RECOVERY | (wiki incomplete) | (wiki incomplete) | (wiki incomplete) |
| RESCUE_SW | GPS Rescue change is in an unsafe place | 20 | Flip off the GPS Rescue change to arm. |
| RPMFILTER(2) | Motor RPM-based filtering will not be functioning | 21 | A number of ESC’s are usually not supplying legitimate RPM telemetry. |
| REBOOT_REQD | Reboot required | 22 | Reboot the flight controller for settings adjustments to take impact. |
| DSHOT_BBANG | DSHOT Bitbang will not be working | 23 | (3) |
| NO_ACC_CAL | Accelerometer calibration required | 24 | Calibrate the accelerometer or disable options that use it |
| MOTOR_PROTO | ESC/Motor Protocol not configured | 25 | Choose the ESC/Motor protocol to make use of on the Configuration tab. |
| ARMSWITCH | Arm change is in an unsafe place | 26 | Toggle the arm change to arm. |
Different Frequent Points
If Betaflight exhibits no arming disabled flags, the issue is likely to be one thing else. Listed here are just a few extra issues to examine:
Accelerometer Points
If the Most Arm Angle in Configuration tab is about beneath 180 (default worth 25), your quad should be underneath this angle so as to arm. In that case, guarantee your quad is on a stage floor, and calibrate the ACC on a stage floor.
If you want to have the ability to arm the drone regardless the angle it’s in, you possibly can disable Most Arm Angle by coming into 180. Some individuals choose to do that because it permits them to arm the quad when they’re caught in timber they usually may be capable to shake it out. However clearly this could possibly be a security concern, so do that at your personal danger.
A defective accelerometer may additionally contribute to the problem, strive disabling accelerometer within the Configuration tab in case you don’t usually fly in Angle/Horizon/Rescue modes.
CPU Utilization
When CPU load is simply too excessive, Betaflight will refuse to arm. You’ll find out the CPU load on the backside of Betaflight Configurator.
Maintain the CPU load beneath 80% (since BF4.3) by adjusting settings, similar to decreasing PID loop frequency, and disabling pointless options similar to LED and mushy serial.
Throttle Points
Guarantee your throttle is accurately calibrated. When your throttle channel’s lowest worth is simply too excessive, Betaflight will refuse to arm. Ideally your channel endpoints needs to be 1000 and 2000. 10-12 beneath 1000 and above 2000 is normally tremendous, similar to 988/990 – 2010-2012, however undoubtedly not above 1000 and beneath 2000, that’s dangerous, by which case you may need to calibrate your radio endpoints.
Betaflight doesn’t arm in case your minimal throttle is simply too excessive (greater than the setting “Min_Check”). It is a security function in order that the quad doesn’t immediately spin up the motors and harm you when it’s armed. You need to be sure that your throttle is decrease than min_check when it’s within the lowest stick place. Min_Check is 1050 by default.
Moron threshold
Some FC may need extra delicate gyro’s and the drone would refuse to calibrate and initialize after energy up, and due to this fact you possibly can’t arm it. By improve “gyro_calib_noise_limit” (initially referred to as Moron Threshold) in CLI can cut back gyro sensitivity throughout initialization. Strive setting it to 100 and even 120.
Conclusion
I hope you discovered this information useful! Let me know within the remark in case your arming drawback was attributable to one thing else that wasn’t coated on this tutorial. In case you are nonetheless having issues arming your quad after following this information, please publish your query on our discussion board, our neighborhood is at all times right here to help and be taught collectively. Glad flying!
Edit Historical past
- Jun 2018 – Tutorial created.
- Feb 2024 – Up to date.
