Anton

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• How to connect espruino and the receiver from an electric skateboard???

  @Anton started

  • 2 comments
  • 2,495 views

  @DrAzzy replied
• How to connect espruino and the receiver from an electric skateboard???

  in Electronics • 6 years, 11 months

  

  Hi hi hi. I decided to make an electric skateboard.
  I need to connect the receiver to Espruino.
  I have such a transmitter and receiver:
  
  
  
  How to connect? How to receive a signal? Where can I connect pins? There are a lot of them here =)

• GPS modul. How to get speed and put it in variable?

  @Anton started

  • 4 comments
  • 4,493 views

  @Anton replied
• GPS modul. How to get speed and put it in variable?

  in Tutorials • 6 years, 11 months

  

  In general, going on the path 1 with yours help, I wrote such code, but there are some strange mistakes = (such as 45 km / h at rest). I tested it in my car. Visually it coincides with the speedometer in my smartphone =)

  //********* 
  Serial3.setup (115200, {rx: P0, tx: P1});
  
  var R = 6371e3; //
  var Led= require('@amperka/led').connect(A1);
  
  var lastData; // 
  var lastData2; //
  var lastLon;  //  
  var lastLat; //  
  var LastTime;
  var toRad=Math.PI/180;
  var i=0;
  
  
  var gps = require ("GPS"). connect (Serial3, function (data) {
    
    if (lastData,i<50) {
     // do stuff here - eg. the difference between the two readings
    //****** distance calc  
      var Lon=data.lon*toRad; // lon в  t1
      var Lat=data.lat*toRad; //lat в  t1
      var diffLon=Math.abs(Lon-lastLon*toRad);
      var diffLat= Math.abs(Lat-lastLat*toRad);
          var a= Math.sin(diffLat/2) * Math.sin(diffLat/2) +
          Math.cos(Lat) * Math.cos(lastLat*toRad) *
          Math.sin(diffLon/2) * Math.sin(diffLon/2);
      
      var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
  var distansP = R * c;
  //****** time diff
  var tTime= data.time.split(':'); // time array
  tTime=tTime[2];
  var diffTime=tTime-LastTime;
      //****** speed
      var speed1= distansP/diffTime; // m/s
      var speed2= speed1*3.6; // km/h 
      
      if(speed2>60){
        
        Led.turnOn();
      }
      else{Led.turnOff();}
   console.log(speed2,speed1);
   //console.log ('1',Math.sin(diffLat/2),diffLat/2,'2',M­ath.cos(Lat),  '3',Math.cos(lastLat*toRad),lastLat*toRa­d,'4',Math.sin(diffLon/2),'5',Math.sin(d­iffLon/2),'6',Math.sqrt(a),a,'7',Math.sq­rt(1-a),'8',diffTime ); Debugging
   
    }
    
  lastData=data;
  lastLon=data.lon; // in degrees
  
  lastLat=data.lat; //in degrees
  
  
  LastTime=  data.time.split(':');
  LastTime= LastTime[2];  
    
  //  lastData = data.time.split(':');
  //lastData2 = lastData[2];
  //  lastLon= data.lon;
    i=i+1;
   
  });
  
  

• GPS modul. How to get speed and put it in variable?

  in Tutorials • 6 years, 11 months

  

  Wow great. it works!!!

  Serial3.setup (115200, {rx: P0, tx: P1});
  var lastData;
  var gps = require ("GPS"). connect (Serial3, function (data) {
    
    if (lastData) {
     // do stuff here - eg. the difference between the two readings
      var dlat =data.time;
   //   var dlon = data.lon - lastData.lon;   
    console.log (dlat);
   console.log ('*->',lastData);
   
    }
    
  
    lastData = data.time;
   // return lastData;
  });
  

• GPS modul. How to get speed and put it in variable?

  in Tutorials • 6 years, 11 months

  

  Hi guys!
  I want to get the speed and, depending on it do an actions, for example, to light the LED.
  I see 2 ways of solving this problem.
  the first one
  Use the standard Esprino library, taken from the link below.
  https://www.espruino.com/GPS

  Serial3.setup (115200, {rx: P0, tx: P1});
  var gps = require ("GPS"). connect (Serial3, function (data) {
    console.log (data);
  });
  

  The following data is displayed:

  {"time": "16:35:29", "lat": 53.068403, "lon": - 4.076282, "fix": 1, "satellites": 7, "altitude": 1085.0}
  

  There is no speed but I can get it if i know Time1 and Time0 and latitude, longitude at Time1, Time0.
  I can colculat the distance pased using formulas from there http://www.movable-type.co.uk/scripts/la­tlong.html.

  , then devide it on diff betvin T1 and T0

  The problem is

  How get latitude, longitude at T1, T0 from this code?
  Serial3.setup (115200, {rx: P0, tx: P1});
  var gps = require ("GPS"). connect (Serial3, function (data) {
    console.log (data);
  });
  if i try somth like this

  Serial3.setup(115200, {rx: P0, tx: P1});
  var gps = require("GPS").connect(Serial3, function(data) {
    T1=data;
  return T1;
  })
  console.log(gps)enter code here
  

  i get empty valus in console.

  .
  the second way is to communicate with serial
  I use such cod

  Serial3.setup (115200, {rx: P0, tx: P1});
  var bufer = '';
  Serial3.on ('data', function (data) {
  bufer + = data;
  var lines = bufer.split ('$');
  bufer = lines [lines.length-1];
  if (lines.length> 1) {
  for (l = 0; l <lines.length-1; l ++) {print (lines [l]);}}});
  

  Problem
  As a result, it get all data from GPS controller but here http://www.gpsinformation.org/dale/nmea.­htm
  I have not found any messages with such codes, and accordingly I do not understand what position, what it means, and how it's to pars it to get the speed. How to pars the
  NMEA sentent ?