Dr_Doggy
Well-Known Member
with my new coilgun , i have set up an optical Chrony to measure my velocities, however while using 3/4 pvc i have found my machine screws to be small enough to pass with out detection, i have treid using pots on my LEDs to turn down sensitivity, which has more success but not enough to satisify,
so i was thinking instead of redesigning, to use an inductive loop to detect when the machine screw passed through each point, however during my tests i notice that, magnets work very well to produce voltage in a single turn coil, but not enough for my tiny needle nose pliers which i believe to have a small amount of magnetism, however by significantly increasing the turns in the coil i was able to get a good response from my pliers.
however even with the scope down to 10mv i was still not able to see response from machine screw even with the larger coil,
based on my results i feel that i should be able to detect machine screw with large coil if i use high enough gain amp, and filters.
but i wonder mostly what amp should i use for this, my guess is that i should receive response at around 10uV +- 1000%, my output will feed to microcontroller digital port. just guessing...
so i was thinking instead of redesigning, to use an inductive loop to detect when the machine screw passed through each point, however during my tests i notice that, magnets work very well to produce voltage in a single turn coil, but not enough for my tiny needle nose pliers which i believe to have a small amount of magnetism, however by significantly increasing the turns in the coil i was able to get a good response from my pliers.
however even with the scope down to 10mv i was still not able to see response from machine screw even with the larger coil,
based on my results i feel that i should be able to detect machine screw with large coil if i use high enough gain amp, and filters.
but i wonder mostly what amp should i use for this, my guess is that i should receive response at around 10uV +- 1000%, my output will feed to microcontroller digital port. just guessing...