SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492024-03-29T04:32:03-06:00SparkFun ElectronicsArnoud Buzing on Creating a Pendulum Monitor with the Wolfram Language and the SparkFun Blocks for Intel EdisonArnoud Buzingurn:uuid:c04d130d-2103-135a-9d82-cd54e426a9e52015-01-06T11:44:07-07:00<p>IslandFox,<p>The angular gauges are actually showing angular acceleration, not linear acceleration. I am working on a version which addresses this (it should be using linear acceleration to make more sense). In either case case, doubly integrating acceleration data (to get position) seems to be something you should avoid doing (i.e.: http://physics.stackexchange.com/questions/36312/calculation-of-distance-from-measured-acceleration-vs-time).</p></p>
IslandFox on Creating a Pendulum Monitor with the Wolfram Language and the SparkFun Blocks for Intel EdisonIslandFoxurn:uuid:85170874-1b7a-493f-8b9c-5d802d6efe312015-01-04T19:49:50-07:00<p>I am seeing that the first angular gauge (the 'x'), always has a slight negative reading (tilted left). The first angular gauge probably denotes up/down movement from the ground. Given that the pendulum almost doesn't leave the ground and stays on the sand surface, it is understandable that we get zero-ish readings for that axis. But why is it always negative? Shouldn't it fluctuate between + and - since the pencil probably rises up from the ground very little and then comes back and so on?<p>I guess I am just wondering how reliable is the LSM9D sensor in general? I was hoping to use this chip for some positional tracking by double integrating the acceleration data. But if there is too much noise maybe this is not the right sensor.</p><p>Not familiar at all with Wolfram language, but in general, the ability to compile C code on-the-fly and then load it as a dynamic library seems cool.</p></p>