6S Batterysensor for FrSky TwoWay

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6S Batterysensor for FrSky TwoWay

Postby takilara » Sat Jul 31, 2010 10:10 am

At some point, I will probably use a microcontroller to receive GPS data, and individual cell voltages from my 6S battery.

However, as a starting point, I am planning to use a simple voltage divider to connect to the "outer" pins of the balance connector.

6S Voltage Divider_crop.png
Preliminary schematics
6S Voltage Divider_crop.png (2.13 KiB) Viewed 2251 times


This should have approximately 3mA current draw, so should not affect flight time too much..

One issue though, i have no "polarity protection", if i connect the balancer plug the wrong way, I will probably blow something Is it possible to put a diode or something in series to prevent incorrect orientation? Will this have an effect on the resistor numbers?
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Re: 6S Batterysensor for FrSky TwoWay

Postby RCModelReviews » Sat Jul 31, 2010 11:08 pm

A diode won't make much difference (just 0.6V-0.7V) which is just 3% of the nominal voltage from a 6S lipo.
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Re: 6S Batterysensor for FrSky TwoWay

Postby takilara » Sat Jul 31, 2010 11:31 pm

I didn't have any suitable diodes around, so i'll skip them for now,
soldered up, and measure 3.25 at output with fully charged batt, now i only have to set up the alarms and test it...
Image
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The price of getting what you want;
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Re: 6S Batterysensor for FrSky TwoWay

Postby RCModelReviews » Sun Aug 01, 2010 12:25 am

Given the low-current involved, any diode (from a 1N4148 to a IN4007 would have done), they all have about the same forward drop and a few mA won't cause any heating. Good job though -- looks great.
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Re: 6S Batterysensor for FrSky TwoWay

Postby takilara » Sun Aug 01, 2010 7:40 am

I only had very large power diodes here (larger than that stripboard), and was too anxious to connect it up to look for any other
The price of getting what you want;
is getting what you once wanted...
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