This project provides a Geiger counter.
The total count, 1min., 10min., and 50min average are displayed with a trend graph.
The trend data can be saved to SDCARD.
GM tube: SBM-20 or Si-29bg (work at 400V)
Daughter-board curcit: HV supply and sense amp.
photo: assembly overview.
LCD backlight control is added for power-save.
JOYSTICK UP:ON / DOWN:OFF