Often you want your flow to start with known conditions. For example you may have a flow that records various sensors, and have alarms set when the sensors exceed a given value. As an example you may want to trigger an alarm when the temperature falls below 3 degrees or exceeds 30 degrees Centigrade. Click to rate this post! [Total: 2 Average: 5]
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A list of node-red node example and usage posts
Node-Red – Storing IOT Data in a SQL Database
IOT data from sensors and other devices usually comes as either a text string usually with key value pairs or more commonly as JSON encoded data. Databases accept a variety of data formats the most common are INT and TEXT. Click to rate this post! [Total: 3 Average: 5]
Continue readingUsing the Node Red Status Node
In Node red any node can report status information in the visual editor. The screen shot below shows the MQTT node. It shows a green circle to indicate that it is connected and the text connected underneath the node. Click to rate this post! [Total: 1 Average: 5]
Continue readingNode-Red HTTP Request Node for Beginners
In node-red there are three core http nodes. http-in -Used to configure a web server http response – used with http-in to send responses. http request – used for making http requests i.e an http client. The http request node can be used for. Retrieving web pages from a website Making API Requests Sending and receiving JSON data to a website or API. etc The node will send a request and receive the response. The request node handles both the request and the response. Note: if you are not familiar with the http protocol then I suggest you read the http basics tutorial. Click to rate this post! [Total: 3 Average: 5]
Continue readingUsing the Node-Red Function Node- Beginners Guide
The function node is used to run JavaScript code against the msg object. The function node accepts a msg object as input and can return 0 or more message objects as output. This message object must have a payload property (msg.payload), and usually has other properties depending on the proceeding nodes. Click to rate this post! [Total: 6 Average: 4.3]
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