Controlling and dimming a LED

In this section, we will discuss a project that can be applied to a home automation. We will dim an LED of DC, this can done to a lamp in a house. The LED will change its brightness, and we connect the LED to the GPIO18 of the Raspberry Pi in series with a resistor of 330 ohms.

Software requirements

First we need to install the pigpio package. In the Terminal, type the following:

wget abyz.co.uk/rpi/pigpio/pigpio.zip

Then unzip the package:

unzip pigpio.zip

After that, navigate to the unzipped folder with the following: 

cd PIGPIO

Type the following to execute the command:

Make

Finally install the file:

sudo make install

Testing the LED

In this section, we will test the sensor with a script in Node.js:

var Gpio = require('pigpio').Gpio; 
 
// Create led instance 
var led = new Gpio(18, {mode: Gpio.OUTPUT}); 
var dutyCycle = 0; 
// Go from 0 to maximum brightness 
setInterval(function () { 
  led.pwmWrite(dutyCycle); 
  dutyCycle...