Secured IoT LoRa Sensor Nodes Reference Design

A safe, low-power sensor community design with encrypted knowledge, NFC authentication, and cloud integration. Study extra!

The MAXREFDES9001 is an IoT safety reference design from Analog Gadgets (ADI) that gives an answer for design engineers trying to implement safe, low-power sensor networks. It includes a LoRa-based temperature sensor node, secured by the DS28S60 cryptographic coprocessor, and features a LoRa gateway and a cloud software hosted on AWS infrastructure. This reference design gives an end-to-end safety framework with authentication and confidentiality impartial of the transmission protocol—on this case, the LoRaWAN protocol. It’s meant for engineers looking for to combine communication and knowledge integrity into embedded techniques.

Design engineers can use this reference design to develop and deploy a sensor node that measures ambient temperature with the DS7505 temperature sensor. The node makes use of the Cortex-M4-based MAX32660 microcontroller to handle communication between the elements and encrypts the temperature knowledge through AES-GCM encryption with the DS28S60 safe coprocessor. The encrypted knowledge is transmitted by the LoRaWAN community to the cloud through a Raspberry Pi-powered gateway.

Engineers can implement NFC-based authentication for sensor nodes to make sure safety. Earlier than transmitting knowledge, the sensor node have to be authenticated through an NFC-enabled Android gadget utilizing the MAX66242 Safe Authenticator. This course of verifies the node’s authenticity and prevents unauthorized gadgets from becoming a member of the community.

As soon as the sensor node is authenticated, the Android gadget interacts with the cloud software to provision the node. This includes producing a certificates for the sensor node and performing an AES-GCM key alternate with AWS infrastructure utilizing the Elliptic Curve Diffie-Hellman (ECDH) protocol. The certificates and key alternate are saved within the DS28S60 coprocessor, making certain the node can securely transmit temperature knowledge to the cloud. The cloud software can additional authenticate the sensor node utilizing ECDSA, confirming the validity of the node’s certificates and key pair.

This reference design is beneficial for engineers who need to safe knowledge transmission, whatever the underlying communication protocols. Whereas the method additionally joins the gadget to the LoRaWAN community through AWS IoT Core, the principle benefit is securing knowledge transmission and making certain integrity, confidentiality, and authentication.

Key elements on this reference design embrace the DS28S60 cryptographic coprocessor, which encrypts knowledge utilizing AES-GCM by an SPI interface; the DS7505 temperature sensor, which gives temperature readings through I2C; the MAX66242, which allows NFC communication between the Android gadget and the sensor node; the MAX32660 microcontroller, which manages communication throughout the modules; and the SX1262, which modulates and transmits the encrypted knowledge through the LoRa protocol. These elements supply an answer for IoT designs.

ADI has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has further knowledge concerning the reference design. To learn extra about this reference design, click on right here.