Otto Biped with LED matrix & rechargeable 9V battery

Here's a remix of Ottodiy bot v13, called Otto 9V, I have used this Otto robot for teaching in my after school STEM/STEAM classes. This Otto 9V has been modified with a slide on Lego top or hat on top of Otto head. The body has a slot for a LED Matrix at the front of body for mouth animations or scrolling letters. There is now a 9 volt rechargeable battery slot and toggle switch. Allowing this Otto battery to be recharged by a mini use cable (old mobile/cell cable) at the back of otto. The stls can be imported into Tinkercad and the slide used for Lego can be modified to make hats. There is a YouTube video tutorial explaining the parts in this Otto 9V We have images explaining the electronics in a schematic and examples of Otto Blockly code in new version Otto Blockly new version and old. More stls now added for Colonel Otto Hat, belt, medals & sword. Plus Otto Blockly version 1.49 Code. Here's the YouTube link to the actions performed by Colonel Otto.