With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.
Tell us about yourself!
use the same circuit just with a relay in the normally closed connection
Just use the relay in the normally closed position, not the normally open like the one in the schematic
Same circuit just use the relay in the normally closed position position, the one on the schematic is the normally open
Join 2 million + to receive instant DIY inspiration in your inbox.
© 2016 Autodesk, Inc.