I would like to use a solenoid
on which I would like to have some position feedback.
I came with the idea of connecting a thin long coil spring
to the mechanism.
Length: 20 >>> 40 ====> L=405 nH >>> 207nH
it can be seen that selfinduction is inversely proportional to the springs length.
What minimal additional electronics and/or what software approach (to translate the changing selfinduction) is required as an input for an AVR?
I intend to PWM control the solenoid current.