The project is designed to
operate electrical loads using an Android application device. The system operates electrical loads
depending on the data transmitted from the Android application device.
Operating conventional wall switches is difficult for elderly or physically
handicapped people. This proposed system solves the problem by integrating
house hold appliances to a control unit that can be operated by an Android
smart-phone/Tablet etc.
Remote operation is achieved by
any smart-phone/Tablet etc., with Android OS, upon a GUI (Graphical User
Interface) based touch screen operation, interfaced to the microcontroller of
8051 family. The program on the microcontroller serially communicates with
Bluetooth device to generate respective output based on the input data (sent
from Android application device) to operate a set of relays through a relay
driver IC. The loads are interfaced to the control unit through the relays. The
system can be used in existing domestic area for either operating the loads
through conventional switches.
The power supply consists of a
step down transformer 230/12V, which steps down the voltage to 12V AC. This is
converted to DC using a Bridge rectifier. The ripples are removed using a
capacitive filter and it is then regulated to +5V using a voltage regulator
7805 which is required for the operation of the microcontroller and other
components.