hello
another DIY thingie.
it is hard to determine distance in dark, hence subsonic shooting past 50 or so meters is not easy.
may be this contraption will relieve the problem.
an atmega328p MCU on arduino pro mini board gets distance data from RS232 LRF module, runs ballistic calculator and sends needed step count and direction
to stepper motor driver.
stepper motor turns elevation adjustment knob of PVS-2 mount.
initially it used pre-calculated table instead of BC,but then i found some BC code on sourceforge, though it does not run on MCU as it is,modification is necessary.
also atmega is not good when dealing with floating point math. especially at 8 Mhz.
calculation time depends on distance - greater distance means more calculator iterations and more time consumed.
it takes around 3 sec for 250 meters calculation for subsonic .22lr.
there is a TTL/RS232 adaptor board attached to the rear end of pro mini board
a cheap i2c OLED display is used for useful info and debugging.
here is older video of testing normal versus fog LRF mode.
some small tree branches - invisible because out of focus - are causing near reflection,which is ignored in fog mode.
https://www.youtube.com/watch?v=3ORJj7ivokY
thanks for reading,any specific questions,let me know.
i will add more detailed info soon.