LoRa Pet Tracker

A low-power, LoRa-based pet tracking system that transmits GPS and activity data from a collar-mounted node to a base station, which relays the information to a visual dashboard and mobile app.

---

Project Structure

lora-pet-tracker/
├── node/              # Microcontroller code for pet collar node
├── base/              # Base station MCU code and Python dashboard scripts
├── app/       # Mobile app built with Flutter

Node Firmware (node/)

This firmware runs on a GPS + IMU + LoRa-equipped microcontroller worn by the pet. This includes:

• GPS data acquisition & compression
• IMU-based wake/sleep logic
• LoRa packet transmission (~912.5 MHz)
• Battery level monitoring
• Remote buzzer control
• Normal/Search mode toggle

For more detailed information, check out the seperate README in the /node folder. PCB Schematics, Assembly Drawings, and all hardware information is also located within /node/hardware.

Base Station (base/)

The base station receives LoRa packets and relays them to Supabase (PostgreSQL backend).

This includes the following features. For more detailed information, check out the Base Station README in the /base folder

• LoRa reception & decoding
• Command transmission to node
• Real-time dashboard (optional)
• Supabase integration for cloud logging

Mobile App (app/)

A Flutter-based mobile application to view location, battery, and command the node remotely. It is accessible both on iOS and Android. FOr installation information and more within the App README

This includes the following features:

• Real-time location & battery updates
• Historical GPS view
• Sleep/Active status
• Remote buzzer activation
• Normal/Search mode toggle

Data Flow Overview

Below is the node-side logic flowchart for LoRa GPS transmission. The node periodically evaluates whether a GPS update is required based on elapsed time. If in Search Mode, GPS is transmitted immediately. In Normal Mode, IMU activity is used to determine if the node is awake and should proceed with GPS transmission. All transmissions await an acknowledgment (ACK) to confirm delivery.

PostgreSQL Table Snapshot

Below are the example tables for device status and device commands.

Column	Type	Description
gps_latitude	float	Latitude in degrees
gps_longitude	float	Longitude in degrees
battery_level	float	Battery percentage
sleep	boolean	True if pet is asleep
timestamp	datetime	When data was recorded
device_id	int	0 (real), 1 (test), etc.

Column	Type	Description
id	uuid	Unique identifier for each command
device_id	text	ID of the device receiving the command
status	bool	Whether the command has been acknowledged
buzzer	bool	Activate (true) or deactivate (false) buzzer
mode	text	Set mode: e.g., "n" for normal, "s" for search
battery	bool	Request battery level if true
timestamp	timestamptz	When the command was sent
gps	bool	Request GPS data if true

Demo App Screenshots

Below are the images for the homepage and history page for the LoRa App

Questions and help

If you have any questions and help, feel free to reach out to the LoRa Pet Tracker Team, Emily, Lauryn, Margaret, and Anqi!