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user101436

Member since Jun 2019 • Last active Aug 2019
  • 2 conversations
  • 15 comments

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  • in Projects
    Avatar for user101436

    Now the code is working I am going to use it to write a module that can calibrate the Mag sensor and then convert mag readings into compass heading and rotation angel since last measurement.

  • in Puck.js, Pixl.js and MDBT42
    Avatar for user101436

    Thanks for the suggestions I have JS-OTP (One Time Password) loading now without the error or memory warning by editing out the ES6 default values. I cut and pasted the GIT hub code into the right hand IDE panel and uploaded it from there. I also removed any browser objects as the code was designed to work in browser.

    But I hit a new issue with HMAC. (HMAC stands for Keyed-Hashing for Message Authentication) The hash features used by JS-OTP and TinyOTP expect a .hmac method on the hash object. The built in crypto libs do not have this feature.

    I don't think I can implement HMAC so I am looking for an OTP implementation that is not using HMAC.

    I will update here when I make progress.

  • Avatar for user101436

    I am now trying Tiny-OTP which is only 4K when minified. I still get a memory error

    1. https://github.com/triestpa/Tiny-OTP
  • Avatar for user101436

    I think I have found the issue the OTPAuth is too large when loaded with the crypto.js lib.

    var crypto = require("crypto");
    var otp = require("https://raw.githubusercontent.c­om/hectorm/otpauth/master/dist/otpauth.m­in.js");
    
    

    Gives the following error

     ____                 _
    |  __|___ ___ ___ _ _|_|___ ___
    |  __|_ -| . |  _| | | |   | . |
    |____|___|  _|_| |___|_|_|_|___|
             |_| espruino.com
     2v03 (c) 2018 G.Williams
    >Uncaught SyntaxError: Got UNFINISHED STRING expected EOF
     at line 1 col 98
    ...aster/dist/otpauth.min.js","(function­(){/*\n otpauth v4.0.0 ...
                                  ^
    Execution Interrupted
    New interpreter error: LOW_MEMORY,MEMORY
    >Uncaught Error: Module https://raw.githubusercontent.com/hector­m/otpauth/master/dist/otpauth.min.js not found
     at line 3 col 81
    ...master/dist/otpauth.min.js");
                                  ^
    > 
    

    I will look for a different OTP lib

  • Avatar for user101436

    Hi I am trying to generate time based single sign on tokens on my Pixl and puckjs. these can then be sent to a PC or phone over BT via the keyboard HID.

    My research so far says that I need the crypto.js lib from modules and OTPAuth from npm as it has no dependencies

    So far I am only getting erros. I think I do not have my requires working I will post more after I get better results

  • in Projects
    Avatar for user101436

    IT WORKS!

    To use:

    1. Upload code via webIDE
    2. Disconnect the IDE
    3. Calibrate the mag sensor by rotating puck in all directions until no red flashes (only green)
    4. Press button to stop calibrating
    5. Connect by BLE from a laptop or phone
    6. run music software
    7. rotate for volume
    8. press for pause/play
    9. Turn over and rotate for next/prev track

    Let me know your results.
    Current things to improve are next/prev un- pauses, the is no power saving mode, and tidy up my code and create some low level functions for calibrate and power management.

    Code:

    var Vec3 = require('Vec3');
    var vMin = new Vec3();
    var vMax = new Vec3();
    var vAve = new Vec3();
    var vZero = new Vec3(); 
    var calibrating = false;
    var calibrated = false;
    var count = 0;
    var h = 0;
    var oldh = 0;
    var r = 0;
    var controls = require("ble_hid_controls");
    var nrf = NRF.setServices(undefined, { hid : controls.report });
    
    /*
    // use this for power managment
    // call a function if button is held down for 4 seconds
    function b4Seconds(callback) {
      setWatch(function(e) {
        if (calibrating) {return;}
        console.log("Button down");
        t4s = setTimeout(function() {
          callback();
        },4000);
        setWatch(function(e) {
          clearTimeout(t4s);
          console.log("Button up");
        }, BTN, { repeat: false, edge: 'falling', debounce: 50 });
      }, BTN, { repeat: true, edge: 'rising', debounce: 50 });
    }
    */
    
    function calibrate () {
      if (calibrated) {
        //console.log('re-calibrating...');
      } else {
        //console.log('calibrating...');
      }
      calibrated = false;
      calibrating = true;
      var xyz = Puck.mag();
      var sMax = 0; 
      var sMin = 0;
      count = 0;
      vMin = new Vec3(xyz);
      vMax = new Vec3(xyz);
      Puck.magOn(10);
      Puck.on('mag', function(xyz) {
        if (calibrated) {return;}
        var vMag = new Vec3(xyz);
        vMin = vMin.min(vMag);
        vMax = vMax.max(vMag);
        if ((sMax !=  vMax.mag()) || (sMin != vMin.mag())) {
          sMin = vMin.mag();
          sMax = vMax.mag();
          count++;
          //console.log('new min or max: ',count);
          // flash the red LED when calibrating
          digitalPulse(LED1,1,100);
        } else { 
        // flash the green LED when not calibrating
        digitalPulse(LED2,1,10);
        }
      });
      //press the buton to stop calibrating
      setWatch(function(e) {
        Puck.magOn(5);
        calibrating = false;
        //console.log("calibarion completed");
        //console.log('max: ',vMax);
        //console.log('min: ',vMin);
        // calculate the average of vMin and vMax to get the nuteral position
        vAve = new Vec3((vMin.x + vMax.x)/2,(vMin.y + vMax.y)/2,(vMin.z + vMax.z)/2);
       // console.log('ave: ',vAve);
        // get the zero position when the end calibrate button was pressed
        vZero = new Vec3(Puck.mag()).sub(vAve);
       // console.log('zero:',vZero);
        calibrated = true;
      }, BTN, { repeat: false, edge: 'rising', debounce: 50 });
    }
    
    
    function calibratedMag() {
      var comQueue = [];
      var coms = false;
      // use the button for play/pause
      setWatch(function(e) {
        if(calibrating) {return;}
        comQueue.push('S');
        digitalPulse(LED1,1,10);
        digitalPulse(LED2,1,10);
        digitalPulse(LED3,1,10);
      }, BTN, { repeat: true, edge: 'rising', debounce: 50 });
      Puck.magOn(10);
      Puck.on('mag', function(xyz) {
        if(calibrating) {return;}
        if ((comQueue.length > 0) && (coms == false)){
          coms = true;
          //console.log(comQueue,coms);
          var comand = comQueue.pop();
          if (comand == 'U') {
            digitalPulse(LED1,1,3);
            try { 
              controls.volumeUp(function(){
                controls.volumeUp(function(){
                  coms = false;
                });});
            } catch (e) {coms = false;}
          }
          if (comand == 'D') {
            digitalPulse(LED3,1,3);
            try { 
              controls.volumeDown(function(){
                controls.volumeDown(function(){
                  coms = false;
                });});
            } catch (e) {coms = false;}
          }
          if (comand == 'N') {
            digitalPulse(LED2,1,3);
            try { 
              controls.next(function(){
                  coms = false;
              });
            } catch (e) {coms = false;}
          }
          if (comand == 'P') {
            digitalPulse(LED2,1,3);
            try { 
              controls.prev(function(){
                  coms = false;
              });
            } catch (e) {coms = false;}
          }
          if (comand == 'S') {
            try { 
              controls.playpause(function(){
                  coms = false;
              });
            } catch (e) {coms = false;}
          }
        }
        // correct mag reading using calibration data
        var vMag = new Vec3(xyz).sub(vAve);
        //console.log('mag: ',vMag);
        h = (Math.atan2(vMag.y, vMag.x) * 180) / Math.PI;
        if (h > 360) {
          h = h - 360; 
        }
        if (h < 0) {
          h = h + 360;
        }
        
        r = Math.round(h - oldh);
        if ((r > 300)) {r = r - 360;} 
        if ((r < -300)) {r = r + 360;} 
        
        if (Math.abs(r) >4) {
          if (vMag.z > 0) {
            if (r>0) {
              comQueue.push('U');
              //try { controls.volumeUp();} catch (e) { }
            } else {
              comQueue.push('D');
            }
          } else {
            if (r>0) {
              comQueue.push('P');
            } else {
              comQueue.push('N');
            }
          }
          //console.log('-------------');
          if (!calibrated) {console.log('uncalibrated!');}
            //console.log('heading: ',Math.round(h));
            //console.log('rotate: ',r);
          if (vMag.z > 0) {
            //console.log('upwards');
          } else {
            //console.log('downwards');
          }
        }
        oldh = h;
      });
    }
    
    
    //calibrate by holding button down for 4 seconds
    calibrate()
    calibratedMag();
    
    
    
    
    
    

    Reset to remove stop code

  • in Projects
    Avatar for user101436

    I will do some optimisation and tidying up then post the final code

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