Deploying Node-Red Flows

When you come to deploying a flow you have four (node-red v0.2)options as shown below: Although the choices appear obvious the effect of the options isn’t and can cause some confusion.

Continue reading

Working with JSON Data And JavaScript Objects in Node-Red

JSON is popular format for encoding data sent over the Internet, and also stored in files. In computing, JavaScript Object Notation (JSON) is an open-standard file format that uses human-readable text to transmit data objects consisting of attribute–value pairs and array data types (or any other serializable value). –wiki

Continue reading

Using 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.

Continue reading

MQTT and Raspberry Pi GPIO

The Raspberry Pi has 40 General purpose Input/output Pins (GPIO) that can be used for controlling external hardware. There are  a number of add-on boards called hats which plug into these pins and provide various sensors. The most common one being the sense hat.

Continue reading

Node-Red HTTP Request Node for Beginners

The node-red http request node is a core node and can be used for making http requests. It can be used for. Retrieving web pages from a website Making API Request Sending and receiving JSON data to a website or API. etc

Continue reading

Node-Red MQTT Data and Topic Logger

This is a data and topic logger similar to the python data and topic loggers that can be used for logging MQTT data to log files either as a single file containing multiple topics or multiple files based on topic. It is controlled using a node-red dashboard making it much easier to use than the python loggers.

Continue reading