It took me some time but at the end I get a very simple option to flight any 2S battery , boot the MM directly on this batt and get some basic telemetry (voltage and an estimate of % of charge).
To use it you need to:
- keep the firmware <= 1.0.400
- set the batt type to 0 (firmware 1.0.500 locked this ...)
And that is.
you can see it in action here: B0B on facebook
The total voltage of the pack is displayed in the temperature field and half the value into each cell gauge.
basically, very few components are needed:
- microchip PIC12F1840 and its firmware ;-)
- 2 resistors to sense the voltage
- a 3.3V LDO regulator
- some connectors
Here is a first mockup:
To use it you need to:
- keep the firmware <= 1.0.400
- set the batt type to 0 (firmware 1.0.500 locked this ...)
And that is.
you can see it in action here: B0B on facebook
The total voltage of the pack is displayed in the temperature field and half the value into each cell gauge.
basically, very few components are needed:
- microchip PIC12F1840 and its firmware ;-)
- 2 resistors to sense the voltage
- a 3.3V LDO regulator
- some connectors
Here is a first mockup: