TurtleFeederInator

Automatic turtle/fish feeder that you can 3D print yourself. It uses WeMos D1 mini (ESP8266) as main board and features food run out sensor.

It can be powered either from USB or DC Jack (5V).

Features

WeMos D1 mini (the one with mounting holes)
SG-90 Servo (or similar)
12x12 Tactile push button (TC-1212T) and button cap
Standard 5.5x2.1mm female DC Jack (i took out one from Arduino UNO)
5mm Infrared LED (you can take one from old remote)
5mm Infrared photodiode
5mm RGB LED with common cathode
3x 220Ω Resistor
100Ω Resistor
2x 20mm M5 hex bolt
2x M5 washer (DIN 125)
2x M5 hex nut
4x small self-tapping screw (two for mount the servo, and two for mount the D1 mini)
2x small silicone washer (they often adding them to computer fans for silencing)
Some wires (ex. from UTP cable)

Scale `spacer.stl` to the thickness of your aquarium wall (by default it's 5mm thick). All the parts you can print with standard PLA.

When slicing `funnel.stl` you must block generating supports near IR led and photodiode holes, like on the screenshot below.

Cura screenshot
To save some time and material, I suggest unticking "Use towers" in support settings when using Cura.

Print all the parts
Solder wires to the IR LED and photodiode, about 8-10cm each
Solder 220Ω resistor to each anode of the RGB diode (longest leg is a cathode)
Attach the servo to the `case.stl` using silicone washers and two small plastic screws, put the cable inside the case using a hole on the bottom
Place M5 hex nuts, push button, DC Jack and RGB LED inside desired holes for them
Secure the button using hot glue
Put the IR LED and photodiode cables through the side holes of the case.
Do all the wiring according to schematic bellow
Secure RGB LED and DC Jack using hot glue
Secure WeMos using self-tapping screws
Attach `spacer.stl` and `hook.stl` to `case.stl` using bolts and washers.
Check if `funnel.stl` fits the `case.stl`, if not use sandpaper on the joints
Secure `feeder.stl` to the servo using cyanoacrylate glue
At this point, everything should look like this
_{^{Yeah, I know it looks quite messy}}
Attach carefully `funnel.stl`
Place the IR LED and photodiode inside their holes (they should hold inside them without any glue)
Upload firmware using USB cable and load it with turtle/fish food

You can use this firmware or write your own.

Comment if you want me to add a link to your firmware here.