Control GPIO Pins of Raspberry Pi4 using Node-Red

Lets learn how to control GPIO Pins of Raspberry Pi4 using Node-Red.
We'll first use raspberry pi specific node palates. And later on, we'll install ui widgets like button, gauge etc. This will let us design very sophisticated node-red dashboard to control GPIO Pins of Raspberry Pi4 from Browser.

This example demonstrate controlling an LED connected to GPIO21 Pin of Raspberry Pi4 from Node-red Dashboard

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