Gravity Lamp

myminifactory

This is a gravity lamp that doesn't need batteries or any power source. It uses the weight of four 250ml cans filled with sand to generate the energy required to light eight LEDs. The power is produced by a stepper motor (42BYGH208-12) and will run for about three and a half minutes from a height of two meters, at which point the weight will need to be lifted and hung on the next hook. As the weight descends, the hook on the ground will rise so that the weight can be moved again once it touches the ground. To convert AC to DC, eight diodes (1N4148) are used, wired as shown in the diagram attached. A 4700µF 35V 85°C capacitor has also been added to reduce flickering of the LEDs and provide a few extra seconds of light when the weight hits the ground, allowing you to see while changing the weight from one hook to another. All plastic components can be printed without support. Here are the parts needed: - One stepper motor (42BYGH208-12) - Eight diodes (1N4148) - One capacitor (4700µF 35V 85°C) - Eight LEDs, 3-6 volts, white, 5mm in diameter - One axle rod, three millimeters in diameter, seventy-six millimeters long - Two bearings, ten millimeters outer diameter, three millimeters inner diameter - Six meters of fishing line, 0.32 millimeters thick - Two M3 bolts, thirty millimeters long - Two M3 bolts, fifteen millimeters long - Four M3 nuts - Some wire - A hot glue gun - Four cans filled with sand, each 250 milliliters Video: https://youtu.be/dHls5iG4jC0