FindMyCat - The Open Source Pet Tracker

The only pet tracker you will ever need. Months long battery life, works outdoors and indoors. It’s Purr-fectly Empowered.

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Most existing pet tracking options I came across were like asking for a gourmet meal and getting a frozen half-cooked microwaved burrito – all for the price of a five-star restaurant.

After being disappointed by them and seeing a lack of a comprehensive open source solution, I embarked on the journey to create one.

FindMyCat is the ultimate pet tracking solution. With a battery that can last up-to 6 months, works indoors and outdoors it outperforms 90% of the commercial options. With no monthly subscription fees and a fully open-source solution, it just might be the only pet tracker you'll ever need.


Official Website:


Let’s look at the Meaowster-mind innovation packed into FindMyCat. Later in this post, I'll provide a more detailed breakdown of the engineering that powers the device.

1. Real GPS for outdoors

For your pets outdoor adventures, there is real GPS tracking powered by Nordic NRF9160, it operates over future proof LTE network so as long as there is a cellular network available, you will have visibility of your pets location.

2. Precise Find

Powered by Apple Nearby Interaction Framework, Bluetooth Low Energy and modern Ultrawideband technology, we have a precise find mode for when your pet decides it’s hide-and-seek time. Whether indoors or outdoors, you can use precise find to locate your pet to an accuracy of 10cm!

3. Smart Tether

For exceptional battery life and a very reliable geo-fence, we have the Smart Tether. When your pet is at home, a tether is created between the FindMyCat Tracker Device and the FindMyCat HomeStation (think of it as a virtual leash). 

This does two things, the Smart Tether instructs the GPS and LTE functionality to go to deep sleep, and send the location updates over your home wifi instead. When your pet leaves the home radius, the outdoor tracking peripherals are enabled, providing seamless transitions between indoors/outdoor location visibility and also a very reliable geo fencing solution.

4. Flexible tracking modes

a. Ping mode

When you want to know where they are, just hit “Ping” on the iOS app, and you’ll know their location within 40 seconds. 

b. Active Mode

If you care to record the history of where they have been, you can put the tracker in active mode. By default the device will report every 7 minutes until commanded to stop. 

c. Lost Mode

Hopefully you never have to use it, but when your pet seems lost, you can put the device in Lost mode and it will broadcast it’s location every 30 seconds until you have found your friend. 

Technical Overview

I’m constantly improving this project, which means that some of the documentation/instructions will evolve over time. Please find the latest extensively detailed engineering documentation at


The Hardware is built around NRF-9160 and DWM3001C. These two SOCs provide the location services for outdoors and indoors using the combination of GPS, LTE, Bluetooth Low Energy and Ultra-WideBand. 

The power delivery to the sub-systems and charging of the lithium-ion battery is managed by ADP-5360 PMIC.   

The HomeStation PCB [under development] is being built around NRF52833 and NRF7002. These are the BLE and Wifi SOCs that make the Smart Tether possible. 

Embedded Software

There are three parts to the embedded software. 

  • Outdoor Location Engine
  • Indoor Location Engine
  • Home-Station

The following figure demonstrates the overview of how they play together in harmony.

There are two ways the FindMyCat device responds (reports location), one internally from the Tracker PCB (Responder) and externally from the HomeStation. The goal is to use these two responders in a way that minimizes the usage of the device's valuable resource, the Tracker Battery, while still ensuring visibility of the device's location.

Both HomeStation and Tracker PCB advertises BLE advertisement packets and scan for packets at different intervals to communicate visibility to each other.

The HomeStation advertises BLE ADV packets every second which the IndoorLocationEngine scans for every 30s. While the packets are visible the IndoorLocationEngine puts the NRF-9160 in deep sleep and HomeStation reports the location via WiFi.

The IndoorLocationEngine activates the OutdoorLocationEngine along with its periodic reporting or goes to ping mode depending on which is selected as default, when it doesn't see the HomeStation nearby.

iOS App

The FindMyCat iOS application is used to manage all your devices and...

Read more »


PCB Schematic for FindMyCat PCB.

Adobe Portable Document Format - 750.82 kB - 09/10/2023 at 23:33


Gerber files for FindMyCat Tracker Device PCB manufacturing.

Zip Archive - 338.73 kB - 09/10/2023 at 23:33



Bill of Materials you can directly import in Mouser cart.

Comma-Separated Values - 2.54 kB - 09/10/2023 at 23:33



Top part of the Tracker Device Case.

Standard Tesselated Geometry - 421.76 kB - 09/10/2023 at 23:34



Bottom Part of the Tracker Device Case.

Standard Tesselated Geometry - 390.90 kB - 09/10/2023 at 23:34


View all 6 files

View all 2 project logs

  • 1
    Engineering Documentation

    All the latest engineering documentation and build instructions can be found at

  • 2
    Source Code Files

    Please find the source code for all software, hardware and iOS App under in Github Organization:

View all instructions

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dofollowlinker wrote a day ago point

Thank you so much for your valuable input and assistance on this forum. Your insights and advice have been incredibly helpful,

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jvrijn wrote 3 days ago point

Nice project, I am only wondering how de USB connector fits in de case while it completely enclosed and the connections for it show on the top of the PCB. Also for future changes I would suggest you make it USB-C.

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Jami Griffin wrote 09/13/2023 at 04:11 point

Cool project! I would definitely make these available commercially

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Sahas Chitlange wrote 09/13/2023 at 14:15 point

Thank you Jami, if there is enough interest, definitely a possibility. I've been thinking about starting a non-profit for this product. 

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Nic wrote 09/13/2023 at 03:27 point

Nice work on the software it looks really clean

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Sahas Chitlange wrote 09/13/2023 at 03:35 point

Thank you Nic, I appreciate it!

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