If you have ever wanted to control electronic devices from your computer to control or regulate your environment, this instructable will guide you. In this example of computer control, a USB relay device (USBmicro http://www.usbmicro.com
- U451) will control two 60 watt light bulbs from a PC program.
Step 1: Safety First!
First off - Any time that you work with 120V voltages, safety is paramount. If you are not comfortable working with mains power, please seek the assistance of someone who is.
This instructable is intended only for someone experienced and confident in wiring high voltages. Do not attempt to do this if you are not. Household current can kill or badly injure you if you who do not understand the danger.
Only the U451 relay contacts should be used for control/connection to 110V AC. The relay screw terminals are isolated from the other circuit connections. DO NOT touch the U451 when there is 110V AC present.
Step 2: Major parts
The major components used for this example instructable are:
USB relay interface USBmicro U451
two light bulbs
110V AC cord
The example project will control two independent 110V AC lights with the two relays on the U451. The U451 and lights will be mounted on a wooden plank.
Step 3: Project mounting board
The lamp sockets are placed on either side of the wooden plank used for this project. The location of the lamps are copied to the plank and traced with a pen. A center line is drawn through the circle to aid in mounting the lamps.
Step 4: Board parts
Four adhesive-backed felt pads are added to the bottom side of the board. This will prevent the board from scuffing the surface that the board is placed upon.
The lamp sockets in this example setup will rest on some washers to provide some space for the wires that lead out from the under side of the socket and to the U451.