FORM-2
THE PATENT ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003
PROVISIONAL SPECIFICATION
(See section 10 and Rule 13)
HOME AUTOMATION
AFTEK LIMITED
An Indian Company
of 265, Veer Savarkar Marg, Dadar, Mumbai-400 028,
Maharashtra, India.
THE FOLLOWING SPECIFICATION DESCRIBES THE INVENTION

Field of Invention:
This invention relates to the field of Home Automation.
Background of the Invention:
To get control on home appliances from control system as well as from switch board there are standard solutions available in market which uses Single Pole Double Through (SPDT) switches or tactile switches in addition with electronic switches like relay. But using SPDT switches, increases the cost of the system wiring. Also, in the case of tactile switch, availability of switch in local market, vendor dependency, or even aesthetics is an issue.
Objectives of the Invention:
One objective of the invention is to reduce the system wiring and avoid it from being bulky.
Another objective of this invention is to reduce the cost of wiring.
Yet another objective of this invention is to prevent the surges or flickers in the current from reaching the load.
Another objective of this invention is to simplify the control of home automation systems.
Summary of the Invention:
The device in accordance with this invention envisages a means for system interface using Single Pole Single Through (SPST) switches
2

replacing Single Pole Double Through (SPDT) switches in home automation.
In accordance with practical embodiment of this invention, an 8-bit microcontroller is envisaged to control the system.
In accordance with yet another practical embodiment of this invention, it is envisaged that the switching is carried out using an electronic switch (relay) and SPST switches.
In accordance with another practical embodiment of this invention, it is envisaged that the load is connected to the electronic switch.
In yet another practical embodiment of this invention, it is envisaged that, change request from user by SPST switch will toggle the state of load.
In another practical embodiment of this invention, the control system is envisaged to request the change of state of the load.
In accordance with another practical embodiment of this invention, the relay prevents the surges or spikes in supply from reaching the load.
In accordance with yet another practical embodiment of this invention, it is envisaged that full power is not required for switching and thus a toggle switch is sufficient.
3

Brief Description of the accompanying Drawing:
The invention will now be described with reference to the accompanying
drawing, in which;
Figure 1 is the block diagram of the System Interface.
Detailed Description of the Invention:
Referring to figure 1 of the drawings, The system in accordance with this invention uses an 8-bit microcontroller, electronic control switch (relay), and an SPST switch interface. The 8-bit microcontroller is interfaced with
the control system over a communication interface. Any request from user with the help of remote control or from other user interfaces like internet, mobile and telephone etc. are routed through system to automation control system to take an appropriate action on appliances. Control system simply sends single bit '0' or '1' to automation control system to make device OFF or ON respectively. Same '0' and '1' level pattern will be generated by SPST switch interface according to its position. As appliances or load is connected to electronic switch and automation control system, controls it, every time system records status of load to get control from both the control system as well as from SPST switch. Also it continuously monitors SPST relay for its status change (from '0' to T or '1' to '0' according to change in position). The change request of load status from control system (by user through remote control etc.) on serial interface is directly implemented by checking various load status. Similarly change request from user by SPST switch will toggle the state of load.
Load flicker observed in SPDT automation control system during system
power 'ON' is taken care by forcefully applying '0' to make load 'OFF'.
4

Automation control system has provision to save load status in nonvolatile memory which helps to retain loads in their previous status in case there is power failure.
Advantages of the Invention:
The invention reduces the system wiring and cost.
The invention uses a standard SPST switch to control automation.
No heavy duty wires required for the wiring of system.
While considerable emphasis has been placed herein on the particular features of a the method of using SPST as SPDT, the improvisation with regards to it, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiment without departing from the principles of the invention. These and other modifications in the nature of the invention or the preferred embodiments will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive
matter is to be interpreted merely as illustrative of the invention and not as a limitation.

5