Tracking GPS data with the Tessel 2

GPS tracking using Tessel 2 and GPS modules: a real-time positioning project based on JavaScript

This article introduces how to build a real-time GPS tracking system using the Tessel 2 microcontroller and its GPS module. Tessel 2 supports JavaScript programming and can extend its functionality through various modules. We will learn how to connect GPS modules, write JavaScript code on Tessel 2-side to process GPS data, and build a Node.js server and front-end Google Maps integration to achieve real-time location visualization.

1. Hardware connection

Connect the GPS module to the A port of Tessel 2 (near the USB power connector). Make sure the GND pin is connected to the GND pin of Tessel 2.

2. Software preparation

1. Create a project: Create a folder named "gps" in the terminal, enter the folder, and run t2 init to initialize the new project.

2. Installing the GPS module: Use npm to install the GPS module: npm install gps-a2235h (Adjust the module name according to your GPS module model). If you encounter an error not found by the pakmanager command, please install it globally first: npm install pakmanager -g.

3. Tessel 2-side JavaScript code

The following code implements GPS data acquisition and sends it to the server through WebSocket:

var tessel = require("tessel"),
gpsLib = require("gps-a2235h"),
gps = gpsLib.use(tessel.port["A"]),
WebSocket = require('ws'),
ws = new WebSocket('ws://[您的服务器IP地址]:5000'), // 将[您的服务器IP地址]替换为您的服务器IP
latestCoords;

gps.setCoordinateFormat({'format': 'deg-dec'});

gps.on('ready', function() {
console.log('GPS模块正在搜索卫星...');

gps.on('coordinates', function(coords) {
console.log('纬度:', coords.lat, '\t经度:', coords.lon, '\t时间戳:', coords.timestamp);
latestCoords = coords.lat + ',' + coords.lon;
});

gps.on('fix', function(data) {
console.log(data.numSat, '颗卫星已锁定.');
});

gps.on('dropped', function(){
console.log('GPS信号已中断');
});
});

gps.on('error', function(err){
console.log('GPS错误: ', err);
});

ws.on('open', function() {
setInterval(function() {
if (latestCoords !== undefined) {
console.log('尝试发送坐标: ' + latestCoords);
ws.send(latestCoords);
} else {
console.log('未收到坐标数据');
}
}, 10000);
});

IV. Node.js server-side code

The following code builds a WebSocket server, receives GPS data sent by Tessel 2 and broadcasts it to all connected clients:

var http = require('http'),
express = require('express'),
app = express(),
bodyParser = require('body-parser'),
server = require('http').Server(app),
WebSocketServer = require('ws').Server,
wss = new WebSocketServer({server: server}),
port = process.env.PORT || 5000;

app.use(bodyParser.json());
app.use(express.static(__dirname + '/public'));

wss.on('connection', function connection(ws) {
ws.on('message', function incoming(message) {
console.log('收到消息: %s', message);
wss.clients.forEach(function each(client) {
if (client !== ws && client.readyState === WebSocket.OPEN) {
client.send(message);
}
});
});
});

server.listen(port, function() {
console.log('服务器监听端口 ' + port);
});

5. Front-end Google Maps integration

Add Google Maps API and JavaScript code in the public/index.html file to display real-time location information and heat maps. (The detailed Google Maps API code is omitted here, please refer to the original text or related tutorials.)

VI. Run the project

1. Run Node.js server: node index.js
2. Run Tessel 2 code: t2 run index.js
3. Open browser to visit http://[您的服务器IP地址]:5000 to view real-time GPS tracking results.

7. Frequently Asked Questions

At the end of this article, we provide FAQs on GPS data tracking using Node.js, including how to use GPS modules, build location-aware applications, tracking in real time with Socket.IO, and tracking in GPS with Tessel 2.

Note that you need to replace the placeholder "[your server IP address]" in the code to your actual server IP address, as well as obtain the Google Maps API key. Make sure Tessel 2 and the server are connected to the same network.

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