electronic / electrical components

The installation largely depended on electronic components for its functionality. Broadly speaking, the installation had two aspects-
1) Act as a piece of art, aesthetically sound
2) Interactive, capable of providing people with a engaging experience

The functionality was as follows-

• Proximity of an observer was detected through  Passive Infrared Sensor ( PIR, incorporating an Fresnels lens and a motion detecting IC )
• PIR sent a signal which was received by the IC ( made by me)
• The IC in turn triggered a DC motor ( 100 rpm ) to rotate.
• A limit switch was incorporated to limit the height of the platform housing another "motor-magnet" setup.
• The limit switch triggered  a signal, which caused the DC motor to stop rotating.
• At this point, the stepper-motor,kept on the platform started rotating, in pre-programmed fashion.
• In case, no-motion was detected for some pre-defined time, the PIR resets, sending a signal. 
• Receiving this signal, the IC made the stepper-motor to stop.
• Then the DC motor starts rotating in the reverse direction, hence the platform came down.
• Another limit switch at this point is used to limit the minimum height of the platform.

A AC-->DC (12 V , 1.5 A) adapter was used to supply power.