An infrared sensor based on composite of polyaniline/polyvinylidene fluoride (PANI/PVDF)/ barium titanate (BaTiO3) with different weight percentages (25, 50, 70 and 100) of BaTiO3 has been fabricated. PANI doped with camphor sulfonic acid (CSA) was prepared chemically. Electrical measurements such as electrical conductivity and pyroelectric current and coefficient of these composites were performed. It was found that the pyroelectric coefficient increases with increasing of the weight percentage of BaTiO3. The behavior of electrical conductivity of PANI-CSA/PVDF/BaTiO3 composite films with different weight percentages of BaTiO3 was followed up the percolation theory. The percolation threshold value of PANICSA/PVDF/BaTiO3 composite films was found at 25 wt.% of BaTiO3. The conductivity of the composite films was increased from 4.08×10-8 S/cm 0 wt.% of BaTiO3 to 8.84×10-6 S/cm at 100 wt.% of BaTiO3. The pyroelectric coefficient values were enhanced from 2.35×10-5 to 1.27×10-3 C/m2˚C at 0 wt.% and 100 wt.% of BaTiO3, respectively.