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

• 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 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 a= Math.sin(diffLat/2) * Math.sin(diffLat/2) +
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);

}

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;

});

``````