Automatic Iris Mechanism

thingiverse

As I dove into figuring out how this project worked, I ended up editing almost all the different elements and adding some more to make 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 look like when 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, which marks where to glue the leaf pin. I glued it on as it makes the leaves easier to print without supports. Supports would leave marks that make the surface rougher and wouldn't spin 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, with the flat side facing away from the pins. The curved inner edge of the spinner should face the leaves to help guide them 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 the distance is close enough, it opens. Line up the two Servos and attach the arms at roughly a 40-degree angle from the short side of the servo. Screw them in (when you've tested it, add a dab of glue to make sure it stays strong). Run the code, the servo arms should move about 90-degrees along the long side of the servo. Attach the servos to the side servo holders, then put the arm...holes over the spinner pins and glue the holders to the side of the iris holder. Put the Ultrasonic sensor in the case and glue it to the base, check the pictures again for reference. Change these numbers in the code and reupload it to adjust the open and close positions: const int close_point = 85; const int open_point = 150; That's it, enjoy!