• 1 Post
  • 31 Comments
Joined 1 year ago
cake
Cake day: August 22nd, 2023

help-circle




  • “Yes I’m weird, and I should be. Jesus didn’t tell us to be of the world, he only told us to be in the world. We don’t conform to that world, and we never will. Don’t hide your light under that bushel, but stand against the darkness that threatens to creep in. Stand against the devil and his minions. Stand against transexuals, leftists, and the woke mob. Stand against the abortionists, the evolutionists, and the false god of science. And when you do, every brother and sister here will stand with you. And all God’s people say-” [crowd] ‘Amen!’.

    A preview of things to come. Please excuse me while I go rinse my brain out.



  • The most basic way to measure movement is with an accelerometer. It’s a little component inside your phone that has a small weight with a known mass connected to springs. When the phone moves or rotates, the weight moves, and the tension on the springs changes. The tension is either constant (you rotated your phone and are now holding it in the new position) or temporary (you moved in a direction and stopped). There are other ways this can be done, but this is the most conceptually simple.

    Steps, length of step, distance moved, and heart rate can be estimated from analyzing the movement in various ways.

    For example, to detect a step, your phone might see movement slightly up and forward, then down, then a jarring impact. Heart rate can be estimated based on your entered weight in an app, your speed of movement, how long you’ve been moving, and averages for people of your weight moving in those ways. This is a very inaccurate way to measure your heart rate, however. A better way would be by a sensor located on your wrist, arm, or chest, which is what smart watches often do.

    Movement measured by an accelerometer can quickly become inaccurate, because small errors add up over time, so for movement over longer distances, phones generally use GPS (communication with a satellite positioning system) which is accurate to within about 5 meters.

    If GPS isn’t available, but the phone is connected to multiple cell phone towers, then it’s possible to triangulate the position of the phone given the tower locations. If we know the distance and direction to the towers, and the position of the towers, then we can find the location of the phone by basically adding an offset to one of the tower locations.

    There are other, more niche ways to measure positions without triangulation or GPS, but they’re generally used for autonomous robotics - laser positioning with reflectors, ultra-wide-band positioning with special sensors, or visual positioning with cameras surrounding the region in which the robot will be working.

    Let me know if you have any further questions.











  • blackstampede@sh.itjust.workstoLemmy Shitpost@lemmy.worldPlease Stop
    link
    fedilink
    arrow-up
    12
    arrow-down
    3
    ·
    6 months ago

    I find the actual technology very interesting. At one point I wanted to create a distributed research journal, and I spent some time trying to develop a trustless, immutable ledger that didn’t have the high overhead that most blockchains have for proof of work. It was extremely cool, but nobody gives a shit unless it has coins lol

    I look forward to 20 years from now when it gets resurrected and used for interesting things that don’t involve cryptocurrency.