Make: Volume 90

of Life

The Breath

I

’m building a companion bot with head motions

but I wanted to add movement to the body as

well, to help it feel more lifelike. I decided on a

breathing motion and designed this 3D printable

gadget that uses springs and a MG90S servo. It’s

controlled by an Arduino running a servo easing

program to vary the rate that the servo moves,

for lifelike motion. See it breathe at youtu.be/Np_

GQmIyw3I, then grab the code and my files for 3D

printing at hackster.io/TheSmallWonder/f7e27e.

1. PRINT THE ENCLOSURE

I printed all parts (Figure

A

) with four outer

shells and 20% infill to prevent it from bending.

2. SET SERVO TO NEUTRAL

Plug y ...