The wireless sensor network(WSN) consists of sensor nodes that interact with each other to collectively monitor environmental or physical conditions at different locations for the intended users. One of its potential deployments is in the form of smart home and ambient assisted living(SHAAL) to measure patients or elderly physiological signals, control home appliances, and monitor home. This paper focuses on the development of a wireless sensor node platform for SHAAL application over WSN which complies with the IEEE 802.15.4 standard and operates in 2.4 GHz ISM(industrial, scientific, and medical) band. The initial stage of SHAAL application development is the design of the wireless sensor node named Tel G mote. The main features of Tel G mote contributing to the green communications include low power consumption, wearable, flexible, user-friendly, and small sizes. It is then embedded with a self-built operating system named Wise OS to support customized operation. The node can achieve a packet reception rate(PRR) above 80% for a distance of up to 8 m. The designed Tel G mote is also comparable with the existing wireless sensor nodes available in the market. The wireless sensor network (WSN) consists of sensor nodes that interact with each other to monitor the environment or physical conditions at different locations for the intended users. One of its potential deployments is in the form of smart home and ambient assisted living (SHAAL) This measure focuses on the development of a wireless sensor node platform for SHAAL application over WSN which complies with the IEEE 802.15.4 standard and operates in 2.4 GHz ISM (industrial , scientific, and medical) band. The initial stage of SHAAL application development is the design of the wireless sensor node named Tel G mote. The main features of Tel G mote contributing to the green communications include low power consumption, wearable, flexible, user -friendly, and small sizes. It is then embedded with a self-built operating system named Wise OS to support customized operation. The node can achiev The designed Tel G mote is also comparable with the existing wireless sensor nodes available in the market.