This LED mason jar turns on by itself at night.
Step 1: Things needed
One mason jar
One 5mm led (color of your choice)
One 3volt button battery
One 82k resistor
One 2n3904 switching transistor
Hot glue gun
Step 2: Schematic(s)
(three pins are collector, emitter and pin.)
Step 3: The NPN
First you're goint to take your pliers and bend the left leg and right leg as shown in the picture. Then tin all three legs.
Bending them this way ensures no shorts.