pwm with voltage monitoring

Hello i need a Idea how run a DC Motor but monitoring the voltage with a A/D pin.

my problem is my Volt Divider is not Stable so mi reading are no correct.

10k and 10.5k in my Divider

Hi, ...

Just read the voltage ... during OFF periods of the PWM drive ...

Alain

that you mean i have to turn off the motor to read the volts
or
please send a example

thanks

Motor is turned off automatically during PWM off ( or LOW ) periods ...

just sample and hold during this moment.

that's how all ESCs current limiting devices work ... they just sample the power mosfets voltage loss ( = Intensity * Rds ON ... ), and compare with a reference.

Here, the "free running" ( PWM LOW state ... ) voltage of your motor is proportionnal to the rotor speed ...

That's all !!!