Made a new LED camp lamp, the lamp is enclosed in a watertight translucent glass.
cutting a circuit board, the size to be able to ping into the cup is limited, at the edge of the circuit board welding lap 120-degree angle scattering LED (I used 24) and put them together in parallel, and the welding a cable.
The McDonald's at the bottom of plastic drink cups cut down the double-sided adhesive foam glued to the LED circuit board beverage cup bottom.
The cup, together with the circuit board inside the cup squeezed, pressed. This fixed-lived.
The LED board cable and switches, 3AA battery clip welding with