KK 2.1.5 Low Voltage alarm

B

BrandonC

Member
Hi, I'm currently using a separate low voltage alarm from Hobbyking that detects if any cell drops below 3.3V. However, I'm not sure if 3.3V/cell (9.9V for 3s) is too low, as the manual for the KK2.1.5 suggests a low voltage setting of 10.8V. That's why I'm trying to hook the battery up to the kk 2.1.5 for better overall control.

From what I could gather, I just need a male to female jumper cable to the positive port on the kk board, but after that I'm not sure if it should be to the red wire on the balance charger cable or to the red main wire of the battery. I'm almost positive that they both do the same thing and are in parallel but I'm apprehensive of experimenting as I'm not sure if it would fry the board. Some clarification would be appreciated! Thanks!

Also, any tips on reducing vibrations? I tried balancing the props but I'm not very good at it yet. Sometimes they seem balanced but when I measure again, they still keep moving around.
 
I've got mine as just a wire from the positive terminal on the kk board (don't need anything on the -ve terminal) connected to the positive on my pdb (ie to the positive main battery wire). I've got it set to 108. Works fine.
 
@Jackson I'm using the Hobbyking lipoly low voltage alarm for 2s-3s i think. I don't think it is adjustable as it just has a buzzer and 2 rows of 3 leds, one side red and the other green.

@glowingturnip
Thanks! Do you know if the red wire on the balance lead does the same thing? That would require less work as I'm using a power distribution cable instead of a board and that would require gold bullet connectors. Since I plug the balance lead directly onto the separate low voltage alarm, I assume it should work and since you could already hook it up directly from the pdb to the kk board, it probably wouldn't fry especially since it doesn't form a complete circuit i think(unless the current somehow travels through the ESC's). I think it should work, but who knows?
Should I give it a go?
 
don't know I'm afraid. You could measure it with a multimeter, see if you get the same voltage readings. You could also measure the current draw if you connect it that way, but I assume that'd be tiny
 
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