Safety control system for portable weapons, including crossbow and firearms, such as handguns, rifles and alike

A safety control system for a portable weapon, comprising:

• a microcontroller for controlling a driver to drive an actuator for actuating a lock mechanism;
• and
• a vital sign detection sensor being in communication with said microcontroller and to detect a human in a direction to which said portable weapon is pointing;
• wherein said microcontroller determines to control said driver to drive said actuator to actuate said lock mechanism to lock a firing sequence of said portable weapon based on a detection signal from said vital sign detection sensor;
• wherein said vital detection sensor is a body temperature sensor comprising:
• a pyroelectric infrared sensor;
• a Fresnel lens having a first side with a smooth surface and a second side with patterns, said second side facing with said pyroelectric infrared sensor;
• and
• a cylindrical housing member for housing said pyroelectric infrared sensor at one end, and said lens disposed at a focal distance of said lens away from said pyroelectric infrared sensor.