Here are the results - click for a larger image:

Here is elevation projected on a satellite image. You can see me doing little hill climbs at the highest altitude (in purple), and then jacking around a lot while everyone else did bigger hill climbs (in blue, under the “Gravel Mountain” waypoint).

This is the same elevation coloring, but projected on a topographic map, and showing the entire morning ride.

This image shows the entire morning ride, and is colored based on distance traveled. You can see where we start in the parking lot in red, and where we wind up back at the cars in purple.

GPSVisualizer.com also provides an elevation profile - here’s elevation versus distance traveled.

Finally, this image shows elevation over time. You can see how we fooled around at the top for a long time (in purple), and where we hit the parking lot four separate times (in orange and red).

If you read this far and want to play yourself, but don’t have any GPS data offhand, please help yourself to the GPX files used to make these images:

• GPS GPX file of the whole ride
• GPS GPX file of the top of Gravel Mountain

Cheers.

The One-Wire protocol (which really requires TWO wires - one for ground, and one for data+power), is reasonable for a cheap local sensor network. But the real reason it’s great is that Maxim/Dallas makes a ton of awesome/cheap sensors that speak One-wire. I can imagine all kinds of uses - here are some of their ideas.

A standard phone line has four wires - here’s how Scott and I hope to use them for a short-haul one-wire network. The little black dot is the temperature sensor (in this case). It uses three of the four wires, but it’s also possible to run some of the 1-wire temp sensors in “paracitic” power mode, where it would only require the OW and ground pins. I don’t have a specific use in mind for the 12VDC pin.

(click the photo for a readable version)
If you’re a real over-achiever, here’s the sketchup file.

Phone wires are so nice, ’cause they’re flipped. You never* have to worry about polarity or “crossed cables”, or junk like that. This idea follows - by embedding small temperature sensors in a standard phone cable extender, a bunch of sensors can be daisy-chained together. Specifically, we stuck a DalSemi DS18B20 high-res temperature sensor (in a TO-92 package) inside a RJ-11 butt-end splice.
* never is a long time. - jengel

I was able to connect six devices directly to one pin of a PIC processor (via six two-foot phone cables), without problems. I suck a thirty-foot cable in there and things didn’t work so well. I wasn’t using a “real” one-wire driver (I was using software “bit-banging” on the PIC, rathre than Dallas’ PC driver). I’m sure you could get WAY better distance over Cat5, or with a “real” driver…

Here are a couple shots of the first prototype:

These are my first HDR photos - made with Photomatix. Here you can see the final result, followed by the three exposures that were used to generate it. I hugely adjusted the saturation/contrast in these. Click on the big pictures for a bigger version.

-1 Exposure	Default Exposure	+1 Exposure
-1 Exposure	Default Exposure	+1 Exposure
-1 Exposure	Default Exposure	+1 Exposure
-1 Exposure	Default Exposure	+1 Exposure

Read more about it here…