Arducopter Auto Armed

ArduCopter Copter 4.5
1

Hi @xfacta @rmackay9

Running Arducopter 4.5.5 on quad. copter Auto armed automatically without user input either from RC or GCS.

Flight mode was seems guided and when pilot trying to arm from RC log file shows Prearm:Mode cannot be armable,but still armed and flipped in the ground itself.

i have checked paeameter ARMING_CHECK = 1 and GUIDED options everything is fine for me.

in the onboard log file data table page i have seen that its armed.

Screenshot 2026-02-23 135458
Screenshot 2026-02-23 135458965Ă—417 152 KB

kindly help me to find in which way copter was armed either by RC or GCS or Forced ARM from GCS.

How to know that from the log if its command excuted from GCS?

2

You are only partially logging the relevant info. MAVC indicates both arming and takeoff command but arming wasn’t forced.

How was the motor interlock actuated?

3

Why such old firmware?

4

Do you have the .tlog from the GCS?

5

The logging parameters are default Setting and there is no interpretation of having this issue being reported to enable full logging parameters.

Motor interlocking is actuated as soon as it get armed or took off.

6

Have this firmware reported this issue in any past ?

7

He is only questioning why you haven’t updated for so long, but firmware version likely isn’t causal.

It was armed and took off via MavLink - that much is clear from your log. The issue appears to be that you don’t know why the GCS or a script attached to it issued the commands. I don’t know that we can help you with that part.

1 Like
8

Reason for having old firmware is running for long time since launched with minimal error for our application till date.

Secondly we don’t have any script loaded on the FC. Its standalone FC system.

9

I don’t mean a script on the autopilot. I mean some script/other software you might be using on the GCS (particularly, anything that uses GUIDED mode).

10

2026-02-14 16-38-32.tlog (362.7 KB)

Here you can find the t.log file.

11

Other than running QGCS on the MK15 system we don’t have any specific applications.

12

Then your operator switched it to GUIDED mode, armed, and issued a takeoff command via the GCS.

13

Yep there’s an arm command at 08:19:10 and 08:19:57 which arms the aircraft.

14

Yes this is what one option probably but in the flight log there is no evidence that it’s triggered from GCS.

I seen all RC channels for arming by the pilot but it’s not armed by the RC sticks .. either pilot was tried before arming using RC sticks but it was in RTL mode and throws prearm :error that mode not armable.

After that mode changed to guided and armed.

15

Arm command by RC or GCS? Guided mode in QGCS definitely need swipe to arm it from GCS right?

16

What is difference between armed (id-10) and auto armed(id-15) in the data flash log under data table.

17

Since it’s a telemetry log, it’ll be through the GCS.

18

Which message is this?

19

Telemetry’s will log all the information even-though it’s armed by RC right ? How we conclude it’s from GCS.

20

The telemetry log includes all information about incoming/outgoing mavlink packets from the GCS. Thus if there’s a command long being sent the telemetry log will record that, and the only way that’s being sent (if it’s in the log) is if the GCS sends it. Telemetry Logs — Mission Planner documentation