This is a OttoDIY++ body by EdisonStembot with added shoulder brackets to add on arms and detachable hands, all model in TinkerCad. The schematic will show you how the 6 servos and infrared receiver are fitted. Reference GoBroRobo.
Note: It is recommended that you 1st do a OttoDIY biped bot at https://www.thingiverse.com/thing:1568652, to learn how to download Arduino IDE and add libraries etc. Also refer to GoBroRobo for additional information and main libraries are in https://github.com/OttoDIY/PLUS/tree/master/libraries.
The Otto+ with arms is powered by 4 x AA batteries, these do a good job but as the batteries discharge below 5 Volts, the Otto+ with arms can end up repeating the last command over and over or just stop. This power problem I am still working on, eventually will be changing to Lipo rechargeable batteries.
Most of these parts printed with just a brim instead of a raft, in PLA with support from baseboard. Please print parts as downloaded, especially the hand for the strongest form.
Overview and Background
Minion Otto+ with arms control by infrared remote
The aim was to teach young people in my Coderdojo, how to build this new prototype Otto+ with arms and solve any problems. GoBroRobo was a good beginning but 1st problem occurred with little room to pack the wires of all six servos, often the head would fall off.
So I have enlarge the size of Otto+ body and head. The next problem was the arm metal servos started to slip as the hole set to hold arm servo in place when moving started to enlarge the hole and the arms fail to move properly.
This remix of GoBroRobo included some 20 improvements to the arm brackets, arms and detachable hands. I have expanded Otto_smooth_criminal_arms_001.ino sketch, using more 'case statements' for buttons 3 to 9 on infrared remote (Tolako IR remote kit).
Otto+ with Arms using infrared remote
Lesson Plan and Activity
Minion Otto+ with arms control by infrared remote workshop
This Otto+ with arms will take about 5 hours to build with code uploaded. In GoBroRobo recommendation was his Calibration.ino sketch that I have used. The problem is there is a error message in the complying this code now. The best manual way is to turn on Otto+, the servos will move turn off the power and adjust the legs and arms to 90 degrees.
Upload sketch Otto_smooth_criminal_arms_003_infrared_remote.ino