This document describes a hand movement based system for controlling a fan and light. The system uses MEMS technology to detect tilt movements which are read by a microcontroller. The microcontroller then controls the direction of a DC motor fan and turns the fan and light on or off based on the registered tilt values from the MEMS sensor. The circuit uses a step down transformer, rectifier, and voltage regulator to power the system from a 230V AC source.

1. HAND MOVEMENT BASED FAN/LIGHT CONTROLLING
ABSTRACT:
The main aim of the project is to control the direction of the DC Motor. A motor is an
electromechanical device, which converts electrical pulse into discrete mechanical movement.
The shaft or spindle of motor is incremented in discrete steps when electrical command pulse is
applied to it in the proper sequence.
The motor rotation has several direct relationships with applied input pulses. The sequence of the
applied pulses is directly related to the direction of motor shaft rotation. In this project we
control the fan by using MEMS technology. In MEMS we have tilt register. When we change the
direction, the tilt registers values are changed and that values are given to microcontroller.
Microcontroller compare this values and depending up on tilt register value occurred in mems ic
the controlling of fan is done by using microcontroller.
Here we will show fan on/off and two different direction according to the mems input. The
microcontroller will take input from mems and according to mems data the fan is being
controlled. This project uses regulated 5V, 500Ma power supply, 7805 three terminal voltage
regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac
output of secondary of 230/12V step down transformer.

2. BLOCK DIAGRAM