Micro Buzzer signal lost low voltage alarm implementation discussion Ideas


#101

NiCe!
Wonder how long it would run on that with no smoke signals.
I hear you on the resonance factor.
We just need to find a light buzzer that will work.

This seems to be an affordable simple option,
Only thing I’m concerned about is the weight.


#102

Got that buzzer working now, thanks @pacer56!

https://goo.gl/photos/b61ZgG7torLfcqrr9


#103

Looks good @littlrussian !
I like the auxiliary battery power tap too, very compact.

I have been thinking that a bit more sound could be obtained from these buzzers by connecting one end to the SciSky on-board +5V supply, while driving the other end to ground from the buzzer pin. That pin is 5V-capable so it should work without damage, but it would require inverting the sense of the drive to the pin. I don’t know of a CLI command that will do that. The older Naze32 boards that had a PNP output would have used that logic, but from Rev5 onwards they utilize an open-collector NPN output drive instead, which inverts the logic.


#104

The buzzer plus plug and wire is 1g


#105

I’m too chicken to solder to the chip, so I’ve been working on a way to drive the buzzer from the LED circuit. An LED configured as a “warning” in Cleanflight will blink at all the times I’d like to hear a buzzer (arming, upside down, failsafe, battery, etc.) I have some of the little chips that the addressable LEDs use, and I have some 3-5v buzzers. I’m working on getting them to talk to each other… ultimately the FC should see the buzzer as just another LED.


#106

Yes @Yags it is a daunting prospect but I am going to give it a go on another FC using 30AWG hookup wire and this method of adjacent pin shielding :smiley:


#107

Found this link. http://www.etheli.com/Micro8mmBrushedQuad/
Same implementation of the buzzer mod on scisky. Hope it helps someone, I won’t be soldering those tiny pins with my setup/skills though.


#108

Nice link @MJ-8 Thanks for that


#109

The buzzer used in these common LiPo low voltage alarms looks really small and light and they are pretty loud. I don’t know enough about electronics to know how it works but could it be removed and used for this solution? How would it need to be wired up?


#110

I just wanted to add this here if no one had seen these 9mm Buzzers that are half the weight of the 12mm models.
http://www.myrcmart.com/buzzer-5v-Φ96mm-long-bi-p-9017.html


#111

Ordered some internally driven buzzers from Digikey and weighted them.
Didn’t really do an objective test which one is the loudest.

CX-0905C 0.69g
WST-0905S 0.71g
AI-1027-TWT-5V-2-R 0.74g
ASI09N27M-05Q 0.98g

Weight wise the CX-0905C is a winner, while the others are not really too far away. The last one is an SMD buzzer and the “not so round” form factor makes it easy to mount.


#112

Some news 'bout this Bluetooth Nut tracker.
http://community.micro-motor-warehouse.com/t/micro-buzzer-signal-lost-low-voltage-alarm-implementation-discussion-ideas/580/52?u=chrisdo
Decased the pcb completely, desoldered those battery clips.
From 8.1g stock to 5g with battery but without case to 1g pcb only.
Tested it with a 1s lipo.
It works :yum:.

This thing isn’t really loud and range will be limited due to Bluetooth. So not comparable to all those buzzer tinkering you guys achieved. But chances to find a lost quad are better than without it.

Didn’t install it to a flying machine yet 'cause I need a second plug on my FC(s) to power it.
Stay tuned. Updates will follow (sometime).


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#113

One step further.
Soldered a jst1.25 connector onto the tracker and the counterpart to FC.
Finished for today. Bedtime now.
Update will follow tomorrow.


#114

Nice hacking there @chrisdo

We love people who ain’t afraid to void warranty’s :slight_smile:


#115

Would have been handy to have on the Runcam I lost today on it’s maiden flight.


#116

That has got to hurt @Denovich. What exactly happened


#117

Oh damn! Did it come off in flight somehow or did gravity get you, and it was lost in a crash?


#118

Came off in flight. Fogot to add a tether. I was flying the race track we setup at the golf course… So I was covering a lot of ground. No idea when it might have come loose. All I know is thaf it wasn’t attached at the end.

Searched for about an hour with help from some of the others. Went back in the evening with a flashlight. But the same result.

Hate losing stuff. I’d have rather destroyed it.


#119

I know. Broken is definite, lost is a well “damn, that is balls” sort of thing…I totally feel the pain,


#120

My commiserations on your loss @Denovich.
Lost a Mobius which was velcroed under my 200qx while flying over high grass. After long time search I was very happy to find it.
Now I always secure it with a leash.

Finished my Nut hack today. Put a layer of liquid electrical tape on the underside of pcb and mounted it onto my tiny hawk.
Also replaced the whip antenna with a BG cloverleaf, fattie jr. instead of mc900 and added a velcro strap to hold my battery.
This thing is heavy now, but hit exactly 65g battery included (or little less depending which lipo in use).
No time and a lot of wind today, so outdoor test is delayed.

Could save some weight with direct wiring, but want to keep everything modular. Also could shorten the antenna a bit. But who cares :stuck_out_tongue_winking_eye:.