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R1 is the usual victim of PCB traces being shorted. Make sure when you mount the board that it doesn't touch any conductive material (nuts and bolts, usually). I had this problem and after I replaced the R1 resistor I had my Tri flying You need 2.2Ohm resistor here (2R2). I got one from the old PC motherboard. Cheers! |
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I'm only asking because I'm lazy today and waiting for my battery to charge.
But I have been setting the KK2 voltage alarm to 66 for my two cell pack and it works fine. What I'd like to know is if the KK2 turns off the motors when the low voltage is reached? I can set the voltage sensor to (say) 76 (7.6v) and try it, but wonder if anyone knows for sure. I'll try it later today anyway. |
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Ok I just completed some tests and here's how they went.
Remembering that with the voltage sensor set at 66 the kk2 started beeping after about 8 minutes and the frequency of the beeps quickly increased over about 15 seconds until the motors stopped. This time I set the sensor to 78 and the beeper started after only 3 or 4 minutes and very slowly increased their speed over the next 4 minutes hovering until the motors quit. I immediately looked at the voltage readout on the kk2 and it showed 5.9 volts. Not good! So in future I will set the sensor at 68 giving me plenty of time to land an shut down without waiting for the auto shutdown which has probably shortened my battery life. Not much of a worry as this turnigy nanotech 800mAh 2cell has done 30 or so flights so far and I have three new batteries on order, as well as 1000mAh and 450mAh 3cell batteries here to fly with. I'm still wondering if the kk2 or the esc's are shutting down the motors at 5.9 volts. The esc's are hobbyking 6A units flashed with bs.hex from simonK. |
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You can definitely run the voltage detector on the KK2 without the ground wire connected and only the positive (+) connected. I had to do this because the ground wire broke off and I could not re-solder the wire back on. No matter how hard I tried, the solder would not stick. Tried a flux pen and 60/40 rosin core solder and it wouldn't stick. So now I have been running the voltage detection with just the positive connected.
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dumb question.. what kind of wire do you guys use for this? Will a regular 22AWG silicon wire with a JST connector do?
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I pulled a solid piece of 24AWG out of a scrap cat5 cable and just soldered it directly to an ESC battery lead. No connectors are needed and the wire gauge really doesn't matter. It's only measuring voltage, not pulling any current.
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Thanks for the quick reply.. I'm just not sure I understand correctly. I'm quite new to this hobby, as you will/might have notice.. So, I guess you soldered one end of the wires to the + and ground on the KK2 board, and where did you solder the other end? Not sure what the ESC battery lead is.. Is this the Positive wire going to the ESC??
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You can use any wire you want. I suggest you solder 1 pin to the hole, and use an old servo wire. Solder the servo wire to any + connection of your battery. This can be where the battery connect to the ESC, or where-ever. Then plug the other end of the wire into the pin you added to the KK2 board. See photo below. Note where the arrow is pointing. This is where I added a pin to the board, and plugged in the battery voltage for monitoring: |
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I'd be surprised if there were a "maximum" that would harm the board. It isn't pulling any current, just comparing the voltage to ground. 4S should be fine. Make sure your ESCs and such are up to the task.
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No voltage stud hole on my KK2.0Quote:
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Hello,
Does anybody know if the KK2.0 voltage alarm is tied to power? My alarm seems to go off after only a minute of flying ? I am using a 4cell 2200mah (30c to 60c burst) battery. I set the voltage to 14.8 volts. Shown as 148 The Alarm goes off very quickly and the copter just comes down NO matter how much throttle I give? When I land I see I still have 15+ volts? Is there a way to disable voltage protection power setting, yet still have the alarm go off? Thanks |
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Last edited by bryont; May 31, 2014 at 11:10 PM.
Reason: grammer and spelling
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