In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Ductapemaster wrote:

I own an R/C helicopter and it uses a 3 cell lipo battery pack for power.  I need some way to monitor the battery voltage in flight so that when it drops past a certain point (about 3 volts per cell), I get an indication that I need to land.  There are many commercially available products for this purpose, but being a DIY person, I want to build one myself.  I am designing mine off this: http://www.tcdynamics.com/prod04.htm

The circuit watches the voltage of the battery pack while under load and it has set points where it lights the RGB led different colors.  I don't need something quite this fancy (I was thinking a bi-color LED) but if its easy to do I don't mind programming it.

So, I need some help designing this.  To keep things simple I would like to use the SX's built in ADC, if it's accurate enough.  The voltage measured will range from 12.5+ volts to a bit below 9 volts.  As far as I know I will need some sort of voltage divider to bring it down to a level that the SX can understand.

Has anyone done anything like this before?  Any suggestions?

Thanks!

-Dan

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