1 cheap wooden shelf ($12)
1 cheap wooden shoe rack ($3)
1 cheap wireless door bell ($15)
1 small spring (free out of broken toy)
3 2" nails
1 plastic boot mat ($2)
Glue or epoxy ($3)
Assemble shelf. Take top rack off shoe rack, place on shelf mark for lay out of door bell switch, spacer blocks and spring.
Fasten Switch, blocks and place rack on top and fasten with nails.
Note: Drill pilot holes for nails so the wood doesn't split.
Glue boot mat on rack, this is to stop the cat from slipping between the rack spaces.
Install spring, You might need to shorten spring to adjust the pressure needed to activate the switch. Take wire cutters and clip as necessary. You need just enough to keep the switch and rack apart when no weight is on.
Placement. I put mine under the window that's close to the door, the cats responded to the placement well. Your cat will be the defining factor on placement.
This works so great for my cats, as they want inside they jump on the door bell.
lol and my step is slanted for drainage so my set up looks twisted
Note: you can also just make it out of just the shoe rack, so its lower to the ground. my cats like it high by the window.