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This article reports a sub-GHz, 868MHz, battery operated miniature sensor node with a fabricated helical Printed Circuit Board (PCB) and a third party whip antenna for Internet of Things (IoT) applications. CC1310 System on Chip (SoC), a sub-GHz family wireless microcontroller, is used to design the system. A HDC 1050 temperature and humidity sensor is interfaced with the microcontroller. The system has the desirable benefits of being small and inexpensive, long battery life and capable of long transmission range. The path loss exponent is calculated from Received Signal Strength Indicator (RSSI) values in two environments - free space and across concrete obstructions. A wireless sensor network is incorporated into a cloud platform for real time monitoring, and web application has been developed for data display and analysis. To validate the proposed IoT system, the measured data is compared with an independent meteorological data set from the Indian Meteorological Department, Cyclone Warning Centre, Visakhapatnam.

Internet of Things (IoT) becoming an increasingly growing topic of conversation in recent studies. IoT is a basically connecting any device to the internet over different wireless protocols such as Wi-Fi, 3G/4G, ZigBee, Bluetooth, RFID and other new wireless protocols such as BLE, 6LoWPAN etc. Today's challenging part of IoT industry is, to design a low-power sensor nodes which can be interoperable with multiple gateways through some wireless protocols. So here we target to design a sensor node which can work with low-power in energy harvesting situations. We enabled these devices with battery operated one. The sensor node is interfaced with "sensor Nest" by I2C protocol. The "Sensor Nest" is combinations of multiple sensors are mounted in a single board and connected via I2C two wire interfaces. For the current application, we interfaced HDC1008 and BMP180 to measure the atmospheric parameters like Temperature, Humidity and Pressure. The designed sensor node is interoperable with any gateway capable of 6LoWPAN over 868MHz LoRa frequency band.