For less than $50 of easy to find parts and a little ingenuity, we can let our best friend out as we approach home so he can meet us at the door. If for some reason we can't be home on time, we can open the door from anywhere. We could even program a timer to automatically let him out in case we didn't have service.
We've also created prototypes that can open the kennel door or activate other items as we approach or leave home, work, or any other location. You can find out more on the Internet Your Thing Kickstarter project.
Download a fully working server here, just unpack it and run.
Get the full source here. A complete list of all technology used is published at the end of this howto.
Step 1: Prepare
- aluminum or steel flat stock: (local hardware store) 1/16 inch thick, 1 inch wide, 2 feet long
- bolts and nuts: eight 10-24 x 1/2 inch long or similar
- board or rod: approximately two feet long
- pulley, small
- string: approximately two feet
- weight: a small water bottle works well
- hobby servo like B1221
- small stiff wire: three inches
- arduinio or derivative microcontroller and small stand-offs for mounting
- wire: approximately 4 feet (old telephone or Ethernet cable works great)
- electrical tape
- Twist ties from toy packaging
- large wrench or vice to bend metal for servo bracket
- knife or wire strippers