In the present days, home automation using wireless communication and network capabilities made the monitoring of remote parameters of sensor nodes very easy. In smart home concept, monitoring the sensor data plays an important role in detecting any abnormality in the house and taking proper response in time. However, all the existing sensor nodes required high cost and have lower processing capability and may use proprietary operating systems. That is why, these nodes do not provide optimum solution of the modern Smart Home systems. This paper proposes an implementation of cheap, fully customizable, and programmable Raspberry Pi board as gateway for the sensors and it also uses Linux as operating system which is free and open source. The proposed architecture has three main parts: a sensor data aggregator, i.e., Raspberry Pi, a notification system (SMS and Email), and a real time sensor data observation system using PubNub web service. The proposed architecture provides lower cost and user friendly environment than the existing architectures of sensor nodes.