Kakute F7 - can't get buzzer to work

ArduCopter Copter 4.0
1

Subject says it all. Didn’t work on 3.6 either. I’ve checked the wiring several times…also tried 3 different buzzers (all of which worked on a Pixhawk).

I do hear a very faint buzz, when, for example, changing flight modes with my ear pressed right up against the buzzer…so SOMETHING is going on.

Thanks…

2

Buzzer works on my KakuteF7 Mini. The voltage supply is a lot less on the Kakute than a Pixhawk, so if you are using a pizeo buzzer you will likely struggle - use a magnetic buzzer.

3

Andy…is this (link below) what you mean by “magnetic buzzer”?

After more research, (check me) it seems like Pixhawks use “passive” / piezoelectric buzzers (which act kinda like a speaker) that are controlled by PWM signals (and can play many tones), while the Betaflight-type boards are meant to use “active” buzzers which only use voltage (and no PWM), and only play ONE tone.

So by “magnetic” do you mean “active”?

Thanks…

https://www.amazon.com/Gikfun-Active-Magnetic-Continous-Arduino/dp/B01FVZQ6F6

4

I have active magnetic buzzers which still play a tune. I think AP can use either, the only thing is that the active ones appear to play a continuous tone at startup. So I’m sure those will work, how well is anyone’s guess.

5

OK Andy…thanks.

I bought a bag of them from Amazon…I’ll report back.

6

how do you have the buzzer wired?

7

Hey @andyp1per, I am experiencing this situation you’re mentioning above. Buzzer plays a continuous tone at startup then does the traditional Arducopter start up tone. Do you know if there’s a way to avoid that?

8

Not found one - but let me know if you do

9

It has to do w. the state of the buzzer GPIO pin while in the bootloader.

10

@davidbitton any suggestion?

11

let me see what I can figure out. I THOUGHT this was fixed in the Kakute F4 BL, but I don’t see it. it’s a bit over my pay grade, but I’ll try.

12

Ohhh, so the bootloader is probably also responsible for the continuous beeping

13

It is the bootloader; kinda, sorta, but not really. Something must set the pin low on startup, which triggers the buzzer. I need to find where that happens so the buzzer pin is set high.

14

Here is the fix https://github.com/ArduPilot/ardupilot/pull/14632

15

It would be good if this fix is applied to the Omnibus F4 Pro too, as it displays the same startup/bootloader tone …

16

Ok, are you able to verify for me?

17

Any idea if the non-Pro version will also show the behaviour?

I can solder mine up to test if so.

18

Can someone with this problem on a Kakute verify the fix for me if I do them a build? It works for me.

19

Hello I got this type of buzzer and I no longer have this problem on my kakute F7


1 Like
20

Andy I’ll be working on my Kakute-based frames next week…thanks for the fix.