Otto Minion

thingiverse

This is my version of OttoDIY. I wanted to print Otto Minion, but unfortunately, the sourced one wouldn't work for me: My printer didn't perform well with the provided STL file, and I didn't have the necessary Arduino shield. So I decided to start from scratch using FreeCAD and Kicad. Basically, I wanted to avoid supports so I split out arms holders from the main body and made a slot to snap them in later. In addition, I designed a custom shield for the Arduino and the rest of connectors, including a Bluetooth breakout and ultrasonic sensor. As I only have an Arduino Pro Mini, connection to the host computer is made via FTDI pins. Accordingly, the head was designed to allow connection through this interface. BOM: 1 x Arduino Pro Mini 6 x TowerPro-like SG90 mini servos 1 x HC-05 Bluetooth module 1 x HC-SR04 ultrasonic module 2 x 3.7V 1.2Ah AA size li-ion battery 1 x MT3608 step-up converter 1 x TP4065 battery charger module w/protection 1 x active buzzer 1 x push button mini switch on/off 2 x 1/4W carbon resistor (voltage divider for HC-05 Rx pin, as it's 3.3V only: 10k & 4.7k) some pin strips, pin sockets, cables and dupont connectors. A Kicad project is attached for the main shield, including schematics and PCB design. Most surely you will need to adapt it to your needs. 3D printed parts: I only needed to redesign the head, main body, arms, and hands. Legs and feet were printed using the original OttoDIY FreeCAD file from the official site. See pictures for arrangement of components. The main board depicted has an error (corrected in the Kicad PCB provided) as it has Tx and Rx swapped. Have fun.