Post #148 by onepoorguy on the US Policy board

Halls of Shrewd'm / US Policy ❤

Unthreaded | Threaded | Whole Thread (2)

Post Reply | Report Post | Recommend It!

No. of Recommendations: 2

How the Montreal subway system uses a disposable paper ticket for contactless turnstile release: embed a $0.09 chip.

https://www.righto.com/2024/06/montreal-mifare-ult...

--sutton
certain he pays more than 9c/chip at an MLB game

Print the post

Post Reply | Report Post | Recommend It!

No. of Recommendations: 4

Yes, those tiny chips are cheap to make. We would get more than 30000 per 8" wafer. Not sure whose chip they are using. That is often printed on the chip, but at a cursory glance, they didn't seem to look for the logo. It was interesting how they actually deprocessed the chip. That's what I used to do for a living (failure analysis).

But really they are hazardous waste to be dumping in a landfill. The chip is doped with ions (like boron or phosphorous, mostly commonly), and the metal lines are usually Cu or Al. Dumping thousands of these paper tickets in a landfill probably isn't optimal. What's wrong with a simple barcode?

Yes, similar chips are in your credit cards, room key cards, and the like.

Print the post

Post New

Unthreaded | Threaded | Whole Thread (2)

Prev | Next

Announcements

US Policy FAQ

Contact Shrewd'm
Contact the developer of these message boards.

A community forum supporting civilized, and highly helpful, self-educating investors that come together for Shrewdness and merry spirits. These message boards closely follow the look and feel of the old message boards at boards.fool.com prior to the boards redirected to discussion.fool.com. Shrewd'm is not affiliated with the comprehensive and excellent investment website, The Motley Fool (TMF), in any way. The Shrewd commmunity here has owed, and continues to owe, gratitude to The Motley Fool for nurturing a culture of jovial irreverence towards Wall St, and that tradition will continue here.