automatic cat flap

thingiverse

a cheap arduino cat flap with minimal hot glue. components: - arduino nano - servo motor(the size from RC car steering) - 2/4x 6mm M3 screws - SR04 ultrasonic sensor - 6x 15mm wall mouting screws (not too thick, around 2mm is good) - thick paperclip (1mm thick) - whatever method of mounting the hook to the flap - hot glue the sensor to the angled peice. - put screws into bottom of nano holder the slip in the arduino - fit the servo into the biggest peice and screw it in wih the M3 screws - straiten the paperclip - bend the paperclip in the middle with right angle - slot a small amount of any end into through boh ridges of the hook peice and bend one end of it closed - bend the other end of the clip into one end of the servo horn and secure (make sure it doesn't rotate) - secure hook to flap - attach ultrasonic above flap. - servo beside flap at top - put nano wherever servo to D3 ultrasonic: trig to D8, echo to D9 power the servo with the same power source of the nano (not 5v pin) boom boom (i cannot write very good instuctions)