I really should have opted for a bigger robot body. I went with what I thought would be medium sized robot body that would be a bit cramped, but doable. It seems that it’s a small medium body and it’s going to be quite cramped, mainly due to late additions to the design such as using 18650 batteries instead of AA rechargeable batteries. The battery change also prompted heavier duty motors to move this robot around, no additional weight, more torque and no step down converter needed(Sounds like a win to me). So decided to create my own battery cases with a short grocery list of things that I wanted. Here’s that list:
- Holds 2 18650 batteries
- Airflow to draw off heat
- Integrated BMS
- As few as possible bought parts
Not a lot, is what you are possibly thinking and I was too. For me it’s a slow design process, due to my unimpressive CAD skills and being thorough. Though with PLA being more available, I am more likely to do a few test prints for fitting purposes and to be able to wrap my brain around things for it to problem solve. For increased airflow and economical use of PLA, a hexagonal mesh design was incorporated into the case design to hold 2 18650 batteries, a BMS board and be sturdy enough to hold 4 battery clips.
The initial design needs to be longer and a bit taller, because the battery clips are tight and will eventually over stress the thin walled meshed case and to contain the batteries and so it’s necessary to make it more rigid.
One will fit in the base, and the other will be somewhere else. I’d hoped to be able to use three such packs, 1 for the MPUs, 1 for the motors and a backup or alternate one for either more MPUs or accessories such as an arm or or other servos.
Should have the case printed out tomorrow, so that progress can be made on the lid and housing the BMS.
P.S. I’ll be adding to the discussion of robot behavioral programming soon. I’ve also been reading up on behavior trees as far as robotics and AI go, ,quite interesting. Also got my first visitor from China, lately. I’m international!!