Ha! Got it to work with real data… cheap way out though… ran my Java code and made it spit out the data to a file… then copied the data from the file into C so that I had a “hard coded” array in the source code – no need to figure out how to read a file and parse bytes in C 🙂
Here is the visualization with the real data:

Not very enlightening but if you stretch your imagination you can see when I am more active (riding bike and going up and down stairs). Next step, if I have time, is to sync the data points with the actual time of the readings – just have to figure out what the sample rate of the accelerometer is 🙂