The main objective of this project is to develop a low cost home automation system with a touch pad based control panel .

Step 1: Touch Pad Connections

Cheap touch pads are available at any mobile accessories shop.

A touch pad consist of 4 terminals. T1, T2, T3, T4 as show in image.

T1 & T3 are connected with +3.3V & gnd of arduino atmega8 board.

T2 & T4 are connected with analog pin A2 & A3 of controller.

Step 2: How Touch Pad Works

Touch pad gives analog value X & Y axis's value.

so we need to convert analog signal into digital signal. Arduino board have built in A to D converter.

We can segment the touch pad by observing the analog value with programming the controller.

here we will use arduino atmega8.

By simple if else condition we can segment the touch pad in 4 parts.

i have attached my program file.

We are using relay circuit to control high power AC load with controller

I have attached circuit diagram of relay circuit.

Now you can touch on any button and you will be able to turn on or off any appliances.