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September 10, 2011
Check out what you can do with a Beaglebone and other open-source project ideas at http://knek-tek.me
Are you below sea level?
2.2kOhm according to the datasheet.
In the future you’ll probably need to use pastebin or some other text sharing site to keep this formatted well (or heck use GitHub! <— best answer) and then link to that.
If you have devices that are powered at different levels, you should use a level-changing circuit in your I2C lines. Sparkfun sells one but you can also build one easily with 2 transistors. Look for I2C logic level shifting like this application note pdf.
Those values would vary tremendously based on your geographical location, and your location relative to lots of stuff around you. Inside of a building vs outside, near powered train tracks, near overhead power lines, etc. If you want to get an idea of what the magnetic field should look like around you, you need to use the International Geomagnetic Reference Field brought to you by the hard-working folks at NASA and NOAA.
Another use of the Cryptocape for those wondering is to store the key for a tor location-hidden service and to assist with key generation in the first place. Hidden services let people visit your website anonymously and help people in repressive countries evade censorship, which is even more important after China recently started attacking Github.
I wrote about my experience using a Beaglebone to host a hidden service and although I didn’t use the cryptocape, it’d be a perfect place to store the hidden service’s private key securely as well as keeping accurate time to prevent clock-skew attacks since the cape has a RTC module.
I went through these same problems. First, the static IP: I didn’t change anything on the BBB, I changed the settings on my home router that it is connected to, and gave it a static IP address. Now whenever the BBB’s MAC address appears on the network, my router assigns it to 192.168.1.2. Every time, even after reboots.
To get rid of the basic webpage and host your own stuff with apache2, I wrote about hosting multiple websites off the BBB and went through those same issues. My writeup is at the K'NEK-TEK blog here.
Living-room superclusters aren’t going to build themselves!
I got this humidity sensor working and displaying the data live on a website using dygraphs. It’s all hosted on the Beaglebone, too. I wrote about it with lots of code examples at the K'NEK-TEK blog.
Dygraphs make data look super awesome and provide zooming in and out, floating legends, and lots of colors and style choices. All free, open-source software!
about 3 years ago
One big issue is that the Gumstix was operating at a frequency much faster than the watch could handle, so I had to slow the Gumstix’s communications down so the watch could pick it up. That solved my problems. I believe the watch has a max clock speed of 25MHz? So it won’t be able to handle communications faster than that.
Now I’m trying to get it working with my Beaglebone…
No public wish lists :(
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