Issue link: https://resources.mouser.com/i/1300213
White Paper — How to Deploy a LoRa®-based Network for your IoT Application Page 8 of 9 Leveraging the RX231 allows the sensor node to have enough processing power to sample all the connected sensors. Sampling the sensors involves more than just the communication over the wire protocol. Often times sensor readings must be decoded, which can involve mathematical computations including floating point operations. The RX231's RXv2 32-bit core with improved FPU is well suited for this workload. Additionally, the RX231's low power consumption supports the option of running on a battery supply. Thus, the option to power the sensor node from a single-cell lithium-ion battery was designed in, including the circuitry to recharge and gauge the battery. This allows for effective energy harvesting in use-cases that can take advantage of it, such as those with sufficient solar exposure. Of all the included sensors, the GPS radio consumes the most power. To handle this concern, the node was designed in a way that allows the RX231 firmware to control the active state of the GPS radio, allowing further power savings when GPS is not required. Each sensor node must be configured to communicate with a gateway by setting the destination gateway ID. When communicating with a gateway, each sensor node is identified by two pieces of information; one is a user-specifiable LoRa Node ID, and the other is a unique ID written permanently to the device by Renesas during manufacturing. When the node sends sensor data to the Cloud via the gateway, it identifies itself by including a hash of its unique ID. The Cloud, in turn, checks this unique ID hash and creates a corresponding device in the sandbox if one doesn't exist for the node already. This allows for automatic support of additional sensor nodes in the Cloud. Since LoRa bandwidth is limited, a compact but simple protocol is used to transfer sensor data from the sensor node to the gateway. The following are the sensors currently sampled in the available Dots on a Map firmware: ● Humidity (and Temperature) ● Air Quality