Lipo saver DIY project for old ESC

[DUKAFLY]

:cool: I need same information about
Lipo saver DIY project for use lipo with old ESC
Thanks a lot. :)

[Hell-e-Guy]

Hi,
A Couple of ways you can approach this. analog or micro based.
One way is to monitor the Battery voltage with a voltage comparator via a voltage divider with a help of a voltage reference (4041 or 431).
Pass the signal from the receiver to the ESC through a P-channel mosfet.
As long as the batt voltage is above the desired limit, the FET is conducting the signal to the ESC.
If the battery voltage goes below the desired threshold the signal is disconnected.
The ESC should cut power to the motor with no signal applied.
Second way is to use a micro controller with an A/D converter to sample battery voltage. and copy the signal from the receiver from an input pin to an output pin as long as the battery voltage is above the threshold.
I built one like this based on a Cypress PSoC but never used it....

Good Luck !

[ninpofox]

Hello Dukafly,

Check out this thread:
http://www.rcgroups.com/forums/showthread.php?t=264289

I've built 5 of these (3 for 3S and 2 for 2S) and they work great.

Bob Fox

[Hell-e-Guy]

Nice design....
I see some problems with it as a general purpose cutoff.
Some measurements are needed first for the BEC voltage and some knowledge of
how the ESC will react and recover from loss of signal,
but for the electronic freak it is a " K.I.S.S" design
that will do the job.

Nice Work !!!