¶ Elements you need to build Kayra
Note: We're not associated with these sellers in anyway.- Tools:
- access to a 3D printer, ideally experience with printing PETG
- optional: cordless screwdriver (e.g. Amazon)
- Mechanics:
- M3 Screws (5-7mm and 20-23mm in length) and nuts
- Disc shaped servo-horns, same amount as servos
- 16 Servos (eight are sufficient for a biped / lower half humanoid):
- metal-gears
- high torque (ideally 35kg/cm)
- high speed (0,11 sec/60 per degree @ 7,4 V)
- up to 7.4V operation
- we recommend the DS3235MG (as of Dec, 4th: about 17€ each, e.g. Ebay, AliExpress, robotdigg make sure to buy originals and not fakes!)
- Electronics:
- servo control board, we're working with the pimoroni 2040 servo controller based on the Raspberry Pico 2040, easy to program via Micropython
- in the future (alternative 1): PS2 wireless controller (make sure that it's wireless ;-) )
- alternatively (currently not supported in Kayra's software stack): a "traditional" servo controller board based on the PCA9685 chip (e.g. Ebay) Note that you need a single board computer (like a Raspberry Pi Zero) to work with it)
- in the future (alternative 2): mobile phone (idea would be to add a Raspberry Pi Zero W to act as a local webserver)
- servo control board, we're working with the pimoroni 2040 servo controller based on the Raspberry Pico 2040, easy to program via Micropython
- Power supply:
Next, proceed to “part overview”