As the original didn't leave instructions, I decided it would be fun to try and figure out how it worked and ended up editing almost all the different elements and adding some more to it as well so it turned into a remix.

What you need:

• Cyanoacrylate Glue
• Screwdriver
• 2 x SG90 Servos
• 1 x HC-SR04
• 1 x Arduino Uno
• 1 x Breadboard/Mini-Breadboard
• Many Dupont Wires (Like these:- https://www.amazon.co.uk/Elegoo-120pcs-Multicolored-Breadboard-arduino-colorful/dp/B01EV70C78/)

Method:

If you have Blender, open this file to get an idea of what it'll turn out like when it's built. (Only for the build reference)

• full_model.blend

Print:

• 1 x Iris_holder.stl
• 9 x Iris_leaf_pin.stl
• 9 x Iris_leaf.stl

Each leaf has been marked with a little circle indent, this marks where to glue the leaf pin, I glued it on as it makes the leaves easier to print without supports, as supports would leave marks that would make the surface rougher so it wouldn't spin as easily. Place the leaves in the iris holder, circling the edge, one overlapping the next.

Print:

• 1 x Iris_spin_mechanism.stl
• 1 x Iris_bottom_cover.stl
• 2 x Iris_spinner_pin.stl

Place the spin mechanism, over the small pins of the leaves, the flat side of the spin mechanism facing away from the pins, so that the curved inner edge of the spinner is facing the leaves, this helps guide the leaves back in. (I suggest sanding the curved inner edge so it's smoother and the leaves don't catch on the layers) Gently turn the spinner plate to check it closes and opens the iris. Place the cover over the top, line up the two holes so that there is one on the left and one on the right (relative to you as it's circular). Attach the spinner pins to the spin plate, lined up with the holes in the cover so that when you move them along the holes in the cover the spin plate will open and close the iris, then glue down the tabs of the cover to the side of the iris holder. Reference the pictures if my description is nonsense.

Print:

• 2 x Servo_side_holder.stl
• 2 x Servo_arm_2.stl
• 1 x Ultrasonic_holder.stl
• 1 x Ultrasonic_case_lid.stl

Wire the ultrasonic sensor and servos to the Arduino as shown in the wiring diagram. Connect the Arduino to PC. Run this code, if connected correctly, when you wave a hand near the ultrasonic sensor the servos should activate.

// Code Start

#include