I had this idea of building my own bicycle lighting system totally personalized, the lights would have the exact lighting pattern I wanted and the shape I decide, That's why I started to build this ...

In this paper, two circuits, namely Half Adder with twist-connected transistors based NOT (T-NOT) gate and Sleep Transistor (HTS) and Half Adder with T-NOT, Sleep Transistor, and Dual Keeper (HTSD) ...