Temperature sensor data visualisation with Node-RED

Overview

This lesson assumes that a temperature sensor is sending data to The Things Network. In this lesson we will use the MQTT protocol to subscribe to data transmission events. We will create a program in Node-RED to subscribe to the data transmissions and to graph the data coming from the sensor using the in-built Dashboard function in Node-RED.

Learning Objectives

• Learn how to subscribe to a MQTT using the Node-RED MQTT-in node
• Learn how to extract specific sensor data using the Node-RED function node.
• Learn how to create a Dashboard in Node-RED to monitor live data.

Subscribe to MQTT

Open Node-RED

• Click on the Raspberry Pi main drop down menu.
• Select Programming > Node-RED