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This is simple USB port base curve tracer for NPN transistors. This curve tracer is build around Microchip's PIC18F4550 MCU and it does not need driver installations and/or any complex software installations.
Radiation counter: MSP430G2553 for High voltage, counter, LCD display.
One MSP430G2553 is used to control the high voltage and count the particules.
Another MSP430G2553 manages the LCD (Nokia 510).
MCU are programmed with Energia.
Website (schematics, explaination in French):
http://microcontroleurs.blogspot.fr/2014/10/un-detecteur-de-radioactivite-pilote.html