crwdns2933803:07crwdne2933803:0
crwdns2933797:0Walter Galancrwdnd2933797:0crwdne2933797:0
crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Walter Galan
- crwdns2933769:0crwdne2933769:0
- crwdns2933771:0crwdne2933771:0
- crwdns2933801:0crwdne2933801:0
crwdns2933807:0crwdne2933807:0
| [* black] This little guy reads its position hundreds of times per second; we must figure out how! | |
| - | [* black] We first turn to the |
| + | [* black] We first turn to the imaging lens and light guide. We poke, prod, tweeze, and say "please," but it won't relinquish any of its secrets. |
| [* black] The lens/light unit is anchored down by two tiny plastic rivets. They may be lightweight, but they don't survive the removal process. | |
| [* black] The light guide directs infrared illumination from an LED down to the track, while the lens directs images back onto the board's image sensor to read the track patterns as they whiz by—a lot like an optical mouse. |