GeoLinker GPS Visualizer
Real-time GPS tracking for IoT devices. Send location data from ESP32, Arduino, or any device and visualize on interactive maps.
Get Started in Minutes
Start sending IoT notifications in just a few simple steps
Create Account
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Get API Key
Generate your API key from dashboard
Send GPS Data
Send location from ESP32, Arduino, or NodeMCU
View Your Map
See real-time data visualized on map
GPS Simulator
Simulate GPS data and send it to GeoLinker in real-time
cd_xxxxxxxxxxxxxxxxxxxxKey names: letters, digits, underscores only. Sent as payload[0]. Sensor names (temperature, humidity, battery…) are stored as sensor fields. Any other name is custom: up to 5 per device (the first 5 it sends are kept), values up to 30 characters.
Before you write your firmware
- Send
timestampin UTC asYYYY-MM-DD HH:MM:SS(GPS modules already give UTC). Points timed in the future or more than a year ago are placed at the time we receive them. - Send sensor values as their own fields:
speed,battery,temperature,humidity,altitude,heading,accuracy,signal_strength,satellites. - Anything else goes in
payload: up to 5 custom names per device, with values up to 30 characters. The first 5 names a device sends are kept, so choose them before you deploy. To start over, use Delete All History on the Live Map.
1#include <WiFi.h>
2#include <HTTPClient.h>
3#include <TinyGPS++.h>
4#include <HardwareSerial.h>
5
6const char* ssid = "YOUR_WIFI_SSID";
7const char* password = "YOUR_WIFI_PASSWORD";
8const char* apiKey = "YOUR_API_KEY";
9const char* device = "esp32_tracker";
10
11TinyGPSPlus gps;
12HardwareSerial SerialGPS(1);
13
14void setup() {
15 Serial.begin(115200);
16 SerialGPS.begin(9600, SERIAL_8N1, 16, 17);
17 WiFi.begin(ssid, password);
18 while (WiFi.status() != WL_CONNECTED) delay(500);
19 Serial.println("WiFi connected!");
20}
21
22void loop() {
23 while (SerialGPS.available()) gps.encode(SerialGPS.read());
24 if (gps.location.isUpdated()) {
25 sendLocation(gps.location.lat(), gps.location.lng(),
26 gps.speed.kmph(), gps.altitude.meters());
27 delay(10000); // every 10 s
28 }
29}
30
31void sendLocation(float lat, float lng, float spd, float alt) {
32 HTTPClient http;
33 http.begin("https://circuitdigest.cloud/api/v1/geolinker");
34 http.addHeader("Content-Type", "application/json");
35 http.addHeader("Authorization", "Bearer " + String(apiKey));
36
37 char ts[20]; // UTC from the GPS, "YYYY-MM-DD HH:MM:SS"
38 snprintf(ts, sizeof(ts), "%04d-%02d-%02d %02d:%02d:%02d",
39 gps.date.year(), gps.date.month(), gps.date.day(),
40 gps.time.hour(), gps.time.minute(), gps.time.second());
41
42 String body = "{";
43 body += "\"device_id\":\"" + String(device) + "\",";
44 body += "\"timestamp\":[\"" + String(ts) + "\"],";
45 body += "\"lat\":[" + String(lat, 6) + "],";
46 body += "\"long\":[" + String(lng, 6) + "],";
47 body += "\"speed\":[" + String(spd, 1) + "],";
48 body += "\"altitude\":[" + String(alt, 1) + "],";
49 body += "\"satellites\":[" + String(gps.satellites.value()) + "],";
50 // Anything else goes in payload: up to 5 custom names per device
51 body += "\"payload\":[{\"hdop\":" + String(gps.hdop.hdop(), 1) + "}]";
52 body += "}";
53
54 int code = http.POST(body);
55 Serial.println(code == 200 ? "Sent!" : "Error: " + String(code));
56 http.end();
57}Tutorials
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