An integrated sensor system is implemented using Inter-Integrated Circuit mode (I2C) software, utilizing the PIC182585 MPLAB embedded control system utilizing hardware. The hardware implementation features high level of integration, reliability, high precision, and high speed communications. The system was demonstrated by temperature and CO2 sensors. An extension for Zigbee system is proposed to enhance the security of the integrated system. A bidirectional air/liquid flow sensor is also added to detect the flow magnitude and direction that can be applied to Heating, Ventilating, and Air-Conditioning (HVAC), local and national security within subway systems, and medical equipment. The hardware design of the flow sensor included one heating element and two sensing elements to detect the bidirectional flow.