Inside the lamp there's a piezo sensor and a circuit board.

That piezo sensor can definitely be salvaged. A better hacker than me could probably do something clever with the existing circuit board, but I'd rather just go ahead and do something easy.

According to my documentation each WS2812B can draw 60mA of current. 4 rings of 5 can consume a max of 20*60mA = 1200 mA. That's a bit more than my Arduino Pro Micro can output, so I'll need some supplemental power.

My initial idea is to build a tower of LED rings and then use those to light up the interior.

The bottom ring is affixed via screws and each ring is stacked up with a series of pegs.

This works. However, there are a few problems.

• The status LEDs on the Arduino have a creepy reflection on the interior of the cat (the index card down the middle of the rings is to prevent that from happening)
• The wiring is a bit of a mess
• The pegs are too fragile (bottom row of pegs snapped during disassembly)
• There seems to be a bad solder connection to the piezo sensor, but the assembly made it difficult/impossible to fix
• The distance between the rings and the silicone cover isn't uniform. This leads to bright spots that look weird and uneven.

On the bright side, the rings work pretty well. There's a retaining lip that holds the light strip in place and makes for easy assembly. I think I'll save those for some future project.