Automation lies at the core of much of our modern lives. However, it evolves at radical speeds. The simple concept, to build a machine to perform a task without human intervention, was the engine of the industrial revolution. Now that concept is the driving force behind robotics, self-driving vehicles, and a wide range of advanced technologies.

Most automated tasks are part of a closed-loop system. This system is designed so that the outputs are monitored and fed back to the controller. The controller changes its operation as needed. An example of a closed-loop system is a home thermostat, which monitors the air temperature. When the low set-point is reached, a contact closes in the thermostat, beginning a furnace lighting cycle. As the furnace runs, the room air temperature increases until the high set-point is reached. The contact opens and ends the furnace burn cycle. This is automation.

With electrical relays, it is possible to achieve a variety of automatic functions. A motor starter uses a relay to close a contact that sends electrical power to a motor. In addition, it closes a set of auxiliary contacts that keep the main relay closed. A control mechanism, such as a temperature input or a stop button, can be wired in series with the auxiliary contact. This allows for control of the motor. An expansion of relay logic is the programmable logic controller or PLC. Instead of mechanical relays, a PLC uses a set of input and output contacts connected to a computer controller. Software in the controller then dictates how the inputs and outputs interact. They additionally execute specific patterns of operations, based on programmed ladder logic.

Christmas is upon us again and more than any other time of year, it’s the time of year where people put strain on their electrical system.  The lights on your house and the beautiful decorations you’ve been storing in your attic finally are brought out and plugged in for your friends and neighbors to view and appreciate.  And, of course, the vast majority of homes you visit have at least one Christmas tree.  Since most of these things are electrical, it’s probably not a surprise to you that, as a top Dallas electrician, I start getting a lot of calls this time of year.  Though it’s always nice to have the business with Christmas so close, I thought it’d be great to share with ways to avoid wiring problems with your Christmas decorations this year:

 In general, there are a few important tips that can help you avoid wiring problems.  If your lights look frayed or dangerous, they should always be replaced or repaired before using them, frayed wiring are hazardous.  You should take care that your electrical source is safe before you even begin the installation process.  To avoid the potential for overloads, you should have dedicated circuits installed for your holiday decorations.

Most importantly, you should never try to supply power for your lights without contacting a top Dallas electrician to help you install the necessary equipment and make the necessary safety precautions.  Short cuts are potentially dangerous. I can remember one example where a customer had supplied power to their lights by splicing an extension cord directly into their circuit breaker box!  Even worse, they’d shut the breaker box door, pinching the cabling!  Left unchecked, even if this hadn’t started a fire, damage from a power surge or overload could have easily destroyed their whole breaker, meaning they’d have to spend thousands to repair the damage at the absolute worst time of year!

A recent TedTalk about LED lights has garnered about a million and a half views. That high number isn’t surprising, given that LEDs have been making headlines a lot, lately. Tons of informational articles about the efficiency of LED light bulbs and how to choose them have been circulating online. But this TedTalk is about something quite different – data transmission.