BootBoots - Autonomous Cat Territory Management System

An IoT system using an ESP32-S3 CAM device with AI-powered cat recognition and a humane deterrent mechanism. The system identifies specific cats and can activate deterrents to manage cat territory boundaries.

Table of Contents

• Overview
• Architecture Diagram
• Components
  • Embedded Firmware
  • AWS Infrastructure
  • Documentation
  • Utilities
• Supported Hardware
  • Primary: ESP32-S3 WROOM N16R8 CAM
  • Legacy: ESP32-CAM AI-Thinker
• Project Structure
• Quick Start
  • Prerequisites
  • Initial Device Setup
  • OTA Updates (Preferred)
• Cat Safety Logic
• Related Projects
• License

Overview

I have four cats. My neighbour also has a cat — Mr Boots — who has worked out that my cat flap is unlocked and that my cats' food bowl is, from his perspective, a free buffet. For a while the solution was shooing him out whenever I spotted him, but he's persistent, fast, and frankly quite smug about the whole thing. So I built this.

Meet the culprit. Boots is a sleek all-black cat with bright green eyes and an expression of complete innocence that frankly cannot be trusted.

Mr Boots — looking like he's never stolen a meal in his life

The system needs to tell Boots apart from my own cats, who are allowed in and must never be on the receiving end of a water mist. Introducing the household:

Mu — Maine Coon; undisputed matriarch of the household and absolutely aware of it	Tau — black and white tuxedo; perches in high places and judges everyone	Chi — Maine Coon dark tabby; patriarch of the family and apparently very interested in electronics
Kappa — Chi and Tau's son; inherited his dad's fur and his mum's attitude	Wolf — not a real cat; a stuffed toy pressed into service as a test subject because he's much easier to pose than the others

The AI model is a seven-class classifier trained to recognise each cat individually: Boots, Chi, Tau, Kappa, Mu, Wolf (the stuffed-toy test subject), and NoCat (empty frames). At inference time the classification collapses to a binary spray decision — Boots triggers the deterrent; everyone else is safe. The whole pipeline — camera capture, cloud inference via a SageMaker serverless endpoint running EfficientNetV2B1, and a deterrent sequence of LEDs and a short water mist — runs autonomously. Boots has so far remained unimpressed, but the data is promising.

Architecture Diagram

Components

Embedded Firmware

The embedded directory contains Arduino-based firmware for ESP32 camera devices:

• bootloader - Factory bootloader that checks for pending OTA updates on every boot. Enables single-partition OTA architecture for maximum firmware space.

• catcam - Main application with camera capture, WiFi, Bluetooth LE, SD card logging, and AI inference integration. Includes 15+ custom libraries:

  • BluetoothOTA - Bluetooth-based OTA control
  • BluetoothService - Device status monitoring and image transfer via BLE
  • Camera - Image capture and PSRAM buffer management
  • CaptureController - Capture orchestration
  • CatCamHttpClient - HTTPS POST to AWS SageMaker inference API
  • ImageStorage - Image file management
  • InputManager - Button and input handling
  • LedController - RGB LED control
  • NeoPixel - WS2812 LED driver
  • OTAUpdate - Two-stage OTA update mechanism
  • PCF8574Manager - I2C GPIO expander control
  • SDLogger - Thread-safe SD card logging with FreeRTOS mutex
  • SystemManager - System state management
  • VideoRecorder - MJPEG video recording to SD card
  • WifiConnect - WiFi connection management

The bootloader-based OTA architecture maximises available flash space by using a single large application partition (7MB on ESP32-S3) instead of the traditional dual-partition approach.

AI / ML Training

The local-training directory contains the full offline training and deployment pipeline, designed to run on an M-series Mac with Metal GPU acceleration:

• download_data_multiclass.py — Pulls labelled training images from S3/DynamoDB, organises them into per-cat class directories, and applies an 80/20 training/validation split
• train_multiclass.py — Trains an EfficientNetV2B1-based seven-class classifier (90.97% validation accuracy; 240×240 input, pipeline augmentation, LR range test support)
• predict.py — Runs the trained model against individual images or directories for offline evaluation
• serve.py — Local inference server (localhost:8765) used by the sandbox app to show prediction badges during manual labelling
• export_for_sagemaker.py — Exports the .keras model to TF Serving SavedModel format and packages it as model.tar.gz
• deploy_model.sh — Full deploy pipeline: export → S3 upload → new SageMaker model + endpoint config → live endpoint update

See local-training/README.md for the full workflow.

AWS Infrastructure

The infra directory contains AWS CDK stacks (TypeScript) for cloud services:

• IoT Device Stack - AWS IoT Thing provisioning, certificate generation, and SSM Parameter Store integration
• API Gateway Stack - REST API endpoints for device communication
• AI Training Stack - SageMaker serverless endpoint (TF Serving 2.16, EfficientNetV2B1), inference Lambda, and API Gateway for camera-to-cloud classification requests
• Firmware Cleanup Stack - Lambda function that manages firmware versions in S3, keeping only the 3 most recent versions and auto-updating the manifest

Documentation

The docs directory contains architecture diagrams:

• architecture/architecture-deterrence.drawio - Live deterrence system architecture
• architecture/architecture-training.drawio - ML training pipeline architecture

SVG versions are auto-generated via pre-commit hook when .drawio files change.

Utilities

The scripts directory contains:

• install-hooks.sh - Git hooks installation script

The githooks directory contains git hooks for auto-generating architecture SVGs and TOC updates.

Supported Hardware

Primary: ESP32-S3 WROOM N16R8 CAM

Feature	Specification
Chipset	ESP32-S3 (dual-core 240MHz Xtensa LX7)
Flash	16MB (QSPI)
PSRAM	8MB (Octal SPI)
Camera	OV5640 (5MP, autofocus)
LED	WS2812 RGB addressable (GPIO 48)
Storage	microSD card slot

Legacy: ESP32-CAM AI-Thinker

Feature	Specification
Flash	4MB
PSRAM	4MB
Camera	OV2640 (2MP)

Project Structure

bootboots/
├── docs/
│   └── architecture/          # System architecture diagrams (.drawio + .svg)
│
├── embedded/
│   ├── bootloader/            # Factory bootloader (OTA staging)
│   ├── catcam/                # Main camera application
│   │   ├── include/           # Header files
│   │   ├── lib/               # Custom libraries (15+)
│   │   ├── scripts/           # Build and deployment scripts
│   │   └── src/               # Main application source
│   ├── CLAUDE.md              # Detailed technical context
│   └── README.md              # Embedded firmware documentation
│
├── githooks/                  # Git hooks for automation
│
├── infra/                     # AWS CDK infrastructure (TypeScript)
│   ├── lib/                   # CDK stack definitions
│   └── lambda/                # Lambda function code
│
├── local-training/            # Offline ML training pipeline (M-series Mac)
│   ├── download_data_multiclass.py   # Pull labelled images from S3/DynamoDB
│   ├── train_multiclass.py           # Train EfficientNetV2B1 classifier
│   ├── predict.py                    # Offline inference on images
│   ├── serve.py                      # Local inference server (port 8765)
│   ├── export_for_sagemaker.py       # Export to TF Serving format
│   ├── deploy_model.sh               # Full deploy → SageMaker
│   └── README.md                     # Full training workflow
│
├── scripts/                   # Project-wide utility scripts
│
└── README.md                  # This file

Quick Start

Prerequisites

• Python 3.11 (managed via asdf; required for TensorFlow)
• PlatformIO CLI
• Node.js and npm (for infrastructure)
• AWS CLI configured with nakom.is-sandbox profile
• draw.io desktop app (for architecture diagram generation)
• githooks installed using ./scripts/install-hooks.sh

Initial Device Setup

1. Generate secrets from AWS SSM Parameter Store:

   cd embedded/catcam
   export AWS_PROFILE=nakom.is-sandbox
   python3 scripts/generate_secrets.py

2. Build and flash (USB - for factory-new devices):

   cd embedded/catcam
   ./scripts/factory_setup.sh /dev/cu.usbserial-XXXX

See embedded/README.md for detailed setup instructions.

OTA Updates (Preferred)

Once a device is set up, use OTA updates via Bluetooth:

cd embedded/catcam
export AWS_PROFILE=nakom.is-sandbox
python3 scripts/build_and_upload.py

Then use the web interface to push the update to the device via Bluetooth.

Cat Safety Logic

The deterrence system includes multiple safety layers to prevent false activations:

• Multiclass classification — The model identifies each cat individually (Boots, Chi, Tau, Kappa, Mu, Wolf, NoCat) rather than a binary Boots/NotBoots decision, giving greater flexibility in per-cat logic
• Ultra-safe thresholds — 90%+ confidence required before triggering the spray
• Protected cats — Household cats (Chi, Tau, Kappa, Mu) are hardcoded to never trigger deterrents, regardless of confidence
• False positive prevention — Requires 2+ consecutive positive detections
• Confidence validation — All non-target classes must show low confidence before acting

Related Projects

• sandboxsite - React web interface for OTA updates and device control via Web Bluetooth, plus AWS CDK infrastructure (CloudFront, Cognito, S3)

License

This project is released under CC0 1.0 Universal - public domain dedication.