You can check out Step by Step of what I did in [Week 20].
Molding and Casting
Bill of Material
LIS3DH Acclerometer breakboard
3.7V LI-ion Battery x2
From my struggles I found a simple public accelelrometer example with neopixels by Tony Dicola.
I adapted his code and customized it with my project, adding on prequisites.
I hope to develope it more to work with photoresistor and have better input reading.