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In this paper, a brief description of a low cost wireless sensor network (WSN) node, which is designed using ultra low power based MSP430 and Nordic nRF24L01, has been given. This network works at 2.4 GHz frequency in ISM band. We have also described a biomedical wireless sensor network (BWSN) comprising of ECG (electrocardiogram) sensor that communicates wirelessly through the smart wireless modules with the patients to control device for monitoring and external communication. To get added features and flexibility in the field of biomedical instrumentation, we have connected the wireless sensor network to GSM/GPRS to make the patient's data available globally. This architecture fulfils the requirements of low power, compact size and self-organization with TCP/IP link.