Otto Minion

This is my version of OttoDIY. I wanted to print Otto Minion and found the sourced one, but unfortunately it wouldn't work for me: my printer did not perform well with the provided stl, and did not have the necessary Arduino shield. So I decided to go and remix it from scratch using FreeCAD and Kicad. Basically I wanted to avoid supports so I splitted 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 trhough 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