Controlling the LED brightness


This post is to share a bit more details on how to control LED brightness using Raspberry PI and a bit of python code.

First of all, all the credit goes to Ingmar Stapel who posted all the details on his website on how to setup LED dimmer and recently added the wiring diagram that makes it very easy to reproduce.

Here’s a link to the blog post:

And this is the link to the Youtube video:

The python code is rather simple. Below is the example of LED brightness starting at 100% and gradually reduced to 0%:

import L298NHBridgePCA9685 as HBridge
import time

channel_left = 1 
channel_right = 1

while (channel_left >= 0): 
   print("Brigthness:" + str(channel_left*100) + "%")
   channel_left = channel_left - 0.01
   channel_right = channel_right - 0.01

HBridge.exit ()

Note that the code above required L298NHBridgePCA9685 that Ingmar wrote and shared on GitHub:

The Raspberry Pi Zero W costs £12.82 (+delivery, in my case £2.99). It’s from here:

The L298N DC Motor Driver Module costs $2.30 (free delivery to the UK). It’s from here:

The 16-Channel 12-bit PWM/Servo Driver costs $1.83 (+delivery, in my case $0.21). It’s from here:

The I2C Logic Level Converter costs $0.99 (5 units, +delivery to the UK $0.15). It’s from here:

The LED strip is 12V, and we purchased a variety of them with prices ranging from $2.30 to $11.05 for the 5-meter piece. Here’s one example:

The code is available here: