May 27, 2020 — 1 min read — Electronics

Automated TV Bias Light

When watching movies in a dark room, the flickering image can cause some eye strain so a bias light can really help. There are commercial solutions available but instead since this is a simple build I've made my own that turns on automatically when it gets dark.

The circuit uses a photoresistor or LDR that senses the light levels in the room and turns on an LED strip in the back of the TV to counteract the light from it.

The project is very simple and can easily be done by anyone so it is a perfect beginner project.

You can check out the full details over at Instructables.

The bias light in action.

Tools and materials needed to make this project (affiliate links):

Soldering iron - https://s.click.aliexpress.com/e/_d8xmmf7
Photoresistors (LDR) - http://s.click.aliexpress.com/e/_dZTauwN
2N2222 NPN Transistors - http://s.click.aliexpress.com/e/_d8HSvFx
Asorted resistors - http://s.click.aliexpress.com/e/_dSIvhPF
LED Strip - http://s.click.aliexpress.com/e/_Bf783rEt
Protoboard - http://s.click.aliexpress.com/e/_dYLR0qN
DC Jack - http://s.click.aliexpress.com/e/_dUiKB3j
12V Power adapter - http://s.click.aliexpress.com/e/_dYpFrWh

tv led furniture home improvement photoresistor basic electronics LDR

Written by: Bill Kolicoski

Blagojce (Bill) Kolicoski is a web developer with multiple domain knowledge gathered since he started in 2008, and he's got a real knack for all things tech, especially when it comes to building websites and fiddling with electronics. He's as excited about robots and space as he is about nurturing his garden at home. Bill is a dad who loves sharing his interests with his kids and readers alike, making sure every blog post is filled with easy-to-understand, useful info that shows just how fun and amazing the world of technology can be. His mission is to demystify technology for everyday people so they can be encouraged to play with it.
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