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This is mainly a list of vendors for various items of use in physical computing. You'll also find links to other sites with electronic and mechanical tutorials here as well.

If you don't find what you're looking for, you might also check the Phys Comp notes, where I put more topical links, and things that don't fit into the categories here. For code samples, check the code blog.

Pick from the categories below, or use the text search at the right. I cross-list many links in several categories, So you'll see the more comprehensive sites show up all over the place. If you find a dead link or have a notable experience with one of the vendors or sites on this list, please mail me so I can keep things fresh.

-Tom Igoe

Non-Mercury Tilt Switch

Non-mercury tilt switches are handy for reading when motion's passed a threshold (and much cheaper than accelerometers), but sometimes hard to find. Here's one Hatti Lim found. Thanks to Hatti for the link.

February 04, 2007
Posted by tigoe in Elec. Supplies at 02:00 PM

RepRap and Using Friendly Plastic

The RepRap project is an open-source rapid prototyper. Seems like a very nifty thing to build in one's (well-equipped) basement. Sebastien Baillard from the project sent along some helpful links on using Friendly Plastic as well:

Thanks to Sebastien for the links.

December 02, 2006
Posted by tigoe in Fabrication at 07:50 PM

Schematic symbols for Illustrator

Here's a good set of schematic symbols for Illustrator, for those wanting to avoid circuit layout programs. These do a good job, and let you work in a familiar environment. Thanks to Tarikh Korula for the link.

October 29, 2006
Posted by tigoe in Elec. Reference at 10:22 PM


Decagon sells environmental sensors for agricultural work: soil moisture sensors, pH meters, and more.

October 13, 2006
Posted by tigoe in Elec. Supplies at 04:18 PM


AVR-USB is a library for AVR microcontrollers to allow them to communicate via USB with no additional hardware. It's limited to a 12HMz clock speed, but if it could be overclocked to 16MHz, or if a Wiring or Arduino implementation could be clocked to 12MHz, this could mean Wiring/Arduino with no FTDI chip.

Thanks to Michael Ang for the link.

October 12, 2006
Posted by tigoe in AVR at 08:00 AM