Hackers' Pub

Syntax	Description	Examples
`"` keyword `"`	Finds the string within quotes, including spaces. Case-insensitive. (Escape quotes inside with `\"`)	`"Hackers' Pub"`
`from:` handle	Finds content written by the specified user.	`from:hongminhee` `from:hongminhee@hollo.social`
`lang:` ISO 639-1	Finds content written in the specified language.	`lang:en`
`#` tag	Finds content with the specified tag. Case-insensitive.	`#HackersPub`
condition condition	Finds content that satisfies both conditions on either side of the space (logical AND).	`"Hackers' Pub" lang:en`
condition `OR` condition	Finds content that satisfies at least one of the conditions on either side of the OR operator (logical OR).	`#HackersPub OR "Hackers' Pub" lang:en`
`(` condition `)`	Combines the operators within the parentheses first.	`(#HackersPub OR "Hackers' Pub" OR "Hackers Pub") lang:en`

Ken Shirriff @kenshirriff@oldbytes.space

6/14/2025, 3:44:14 PM

Public

Here's a video of the FDAI in motion. I removed the hemispheres so you can see what happens inside the ball.

Ken Shirriff @kenshirriff@oldbytes.space

6/14/2025, 3:45:08 PM

Public

Why don't the wires get tangled when the ball spins? There are two slip rings that provide electrical contact as the ball rotates around the roll and pitch axes. This closeup shows how stationary brushes contact metal rings on the rotating shaft, allowing 23 connections.

A closeup of one of the slip ring assemblies. It has a cylindrical rotating shaft with 23 metal rings on it. The rings are contacted by 23 pairs of vertical brushes, forming a row on either side of the shaft. The idea is that the shaft (attached to the ball) can rotate and the brushes will stay in contact, providing electrical connections. At the bottom of the image, some colorful wires are visible, connected to metal tabs on the slip ring assembly.

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