Composites of polypyrrole, polyaniline and polythiophene with PVA and PVC have been prepared. Ferric chloride and ammonium persulphate are used as catalyst. These films were further irradiated with ions of Na and Cl. Irradiation using y-rays was also done. The electrical conductivity of the composites has been studied in detail. A six channel multiplexer with PC and related hardware, software has been assembled. The materials developed are very suitable, cheap and reproducible. Cotton fabrics modified by polypyrrole and polyaniline are being used for the integrated heater, smart apparel and EMI shielding. A heating pad using Ppy doped cotton fabric has been developed and tested.