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Simple to use Lipoly low voltage alarm that is small and light for on board use, plugs into balance lead for detecting low voltage on individual cells. A loud alarm will sound and LED will change from Green to Red if any individual cell drops to 3.3v or below.
Spec. Lipoly Range: 2s~3s Size: 38x20x10mm Weight: 5g Voltage Accuracy: 0.03v Low Voltage Alarm Threshold: 3.3v (per cell)
I have the two horn version which works well and is nice & loud. However it is too large to fit in my tx which I use a 3s lipo in so thinking this may fit. My question is: is there a way of disabling the led's so there is no draw on the battery when not in use? Or will the unit continue to draw from the battery anyway? Was just hoping for a cheap easy way of protecting my tx lipo's in case i forget, without the bother of connecting/disconnecting an alarm everytime I want to use it. cheers
What's weird about using LiPos in a TX? I do. Weight reduction and a hell of a lot longer runtime. I have a 3s in my JR6102 with a FrSky telemetry module/screen, and before I charged it, I was using it for about an hour for testing. Then I left and forgot the radio was on, came back about 3-4 hours later and it was just above 9V. So four hours on a pack that hadn't yet been charged. Since charging, I've flown for maybe an hour and a half, and no signs of being anywhere near low voltage. It's great. (I used to have a ****ty factory NiCad pack in there, that never lasted more then 2.5-3 hours, tops.)
The LED´*s are low current LED´*s and won´*t draw much voltage of your bat. Soldering is not so good, because you will loose your TX-warranty. Don´*t you have a display where you can see your voltage. Which TX do you have?
You have to conect the balance plug of your lipo, check the board and you will see where is the positive and negative, just conect the balance plug with red wire on the positive.
aaaaa nothing wrong, connect the cable and shoot there is only one way to connect them, on a burst on auto i hear the beep every time even on semi when i shoot fast it's starts beepin, now I have another alarm with display and sound, it works like a charm shows me the voltage and you can set it when to when to go of.
This alarm is **** for replica, i bought 3 alarms and 3 bateries Turnigy nano-tech 2000mah 2S 15~25C Lipo.
On airsoft replicas the alarms are not good,shoot 3-4 times and its starts beepin every time,and i'm not the only one with this problem, if you want to use them on airsoft replicas i sugest an alarm with display or another brand.
Sounds like you're over-drawing your batteries and need ones with a higher current rating (higher C value). They shouldn't be setting off the alarm otherwise.
How would this fit onto a 2S lipo battery? would you just have one of the prongs from the alarm hanging off the side? and if so, would the extra prong hang off the right or left side? like would the plug a 7.4V lipo's charge plug in the bottom or top 3 prongs? thank you!
Alway have the black lead (negative) on the outside.
Just try, you can't blow it up. Modern electronics most of the times come with polarity protection.
Just tested mine and in decibels i dont know but it has an EXTREMELY ear piercing sound! I guess its very close to the frequency we can hear as best (around 1 kHz or so) but in db i dont think its that very high perhaps. But trust me its very noticeable to say the least..
And btw* the same time you but the battery in it it will sound for about one second so be prepared, i wasnt and im not far from deaf now..
Hey Henry, thanks for the info.
I have a concern about those and since you already have it, I thought I might ask.
When 1 cell drop to <3.3v the alarm will sound but will it shut off once the voltage goes above 3.3?
This is an important factor for me just because all the alarms I have right now suffer from this behavior. When I push the throttle stick to recover from a situation or when pulling up from a hover, the cells voltage drop which is normal... However, when releasing the throttle, the voltage go up again but the alarm keeps on beeping which is misleading...
Thanks
I just tested this out for you and after the battery voltage goes down to about 3.3V it starts to beep at an interval off 0.5 sec on and 0.5 sec off (i would like it to be on constant but oh well) and the same LED that correspond to that battery blinks red at the same interval and the green corresponding led turns off completely at this point.
When the voltage goes up on that battery again to over about 3.3V the beep stop and the green led goes on and the red stop to the next time it goes under again, so it does what you want and also as i want it to do.
The alarm will sound when one or more cells drop under 3.3V and it will shut off if the voltage goes over 3.3V.
When it starts buzzing, you release the throttle (and the alarm stops) and bring it down gently. If you go full throttle against it will buzz again of course.
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Very loud ear piercing sound that is easily heard, however i have not tested it out yet in a quad or similar but im quite sure you would hear it if not to far away and possible even at some smaller distance.
Just when the battery pack is connected it beeps for about a 1 seconds so be prepared for that and green lights come on that show which batteries are connected. If a battery voltage goes down to under about 3.3V it starts to beep at an interval off 0.5 sec on and 0.5 sec off (i would like it to be on constant but oh well, might be able to change some components to do so) and the same led that correspond to that battery blinks red at the same interval and the green corresponding led turns off completely at this point.
When the voltage goes up on that battery to over about 3.3V the beep stop and the green led goes on and the red stop to the next time it goes under again.
Nothing really to complane about exept this interval thing. I would absolutely recommend it but i havent flown with it yet though to see if it could be heard with motors on but im quite sure you would even at a little smaller distance.
I bought two of these. This is a great product. I tried with the alarm is loud and sounds very good from a distance at least 50 meters. Now I am calm about my batteries and know when to stop. I changed the old NiCd batteries on my drill and put lithium polymer 3s now works perfectly and alarm tells when to stop. I strongly recommend taze alarm.
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I use this simple and inexpensive item on my own Multi-rotor craft. The LEDs are a great visual indication of battery voltage and the loud Piezo buzzer lets me know when its time to land with a safe amount of voltage in the pack - Ben
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