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README.md

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+# PRRPC — Pico Real Rich Presence
+
+> Physical status monitor for Linux environments. Displays contextual active application information on a secondary LCD screen powered by RP2040.
+
+**Live:** [prrpc.jrodriiguezg.link](https://prrpc.jrodriiguezg.link)  
+**GitHub:** [jrodriiguezg/PRRPC](https://github.com/jrodriiguezg/PRRPC)
+
+---
+
+## Overview
+
+PRRPC is an open-source hardware/software project that bridges your Linux desktop with a physical secondary display. A Python service running on the host PC detects the currently active application via GNOME's accessibility API and sends that information over USB serial to an RP2040 microcontroller, which renders a graphical icon on a 1.69" IPS LCD screen.
+
+It operates in two distinct modes:
+
+| Version | Mode | Description |
+|---|---|---|
+| V1 | Auto Monitoring | Automatic active-app detection and display |
+| V2 | MacroDeck | Interactive mode with browser-based emoji control |
+
+## Architecture
+
+```
+Host PC (Linux / GNOME / Wayland)
+          │
+          │  pyatspi focus events
+          ▼
+  Python Service (monitor_pc.py)
+          │
+          │  Serial (USB-C)
+          ▼
+    RP2040-Zero (MicroPython)
+          │
+          │  SPI
+          ▼
+  1.69" IPS LCD (ST7789, 240×280)
+```
+
+**Key property:** The serial communication model means **zero CPU polling** on the host — events are pushed only when the active window changes.
+
+## Features
+
+### V1 — Auto Monitoring
+
+- GNOME window focus detection via `pyatspi`
+- Event-driven serial communication (no polling, near-zero CPU impact)
+- Real-time application switching reflected on the LCD
+- Session time tracking per application
+
+### V2 — MacroDeck
+
+- Flask web server on `localhost:5000`
+- Browser-accessible emoji selector UI
+- Manual display override from any device on the LAN
+- Multi-threaded architecture
+- Optimized 100×100px RGB565 image assets
+
+## Hardware Specifications
+
+| Component | Specification |
+|---|---|
+| Microcontroller | RP2040-Zero (or compatible Raspberry Pi Pico) |
+| Firmware | MicroPython |
+| Display | 1.69" IPS LCD, ST7789 controller, 240×280px |
+| Interface | SPI (display) + USB-C (data + power) |
+| Host OS | Linux with GNOME desktop (Wayland/X11) |
+| Host Language | Python + pyatspi |
+
+## Software Requirements
+
+- **Host:** Python 3, `pyatspi`, `pyserial`
+- **V2 additionally:** `flask`
+- **Microcontroller:** MicroPython with `st7789` display driver
+
+## App Mapping (V1)
+
+```python
+# Example: Adding a new app in monitor_pc.py
+APPS_MAPPING = {
+    "Code":      "VSCODE",
+    "Firefox":   "FIREFOX",
+    # Map window focus keyword to an internal ID
+    "Obsidian":  "NOTAS"
+}
+```
+
+## Web Control API (V2)
+
+```python
+# V2: Web control API snippet
+@app.route('/set_emoji/<emoji_id>')
+def set_emoji(emoji_id):
+    # Sends manual Emoji command via serial
+    send_to_serial(emoji_id.upper())
+    return {"status": "success"}
+```
+
+## Gallery
+
+The device has been tested and demonstrated with the following applications on Fedora Linux:
+- **VS Code** — Development environment detection
+- **Firefox** — Web browsing session tracking
+- **Terminal** — System shell activity
+- **YouTube Music** — Media playback tracking
+
+## Tested On
+
+- **OS:** Fedora Linux (GNOME, Wayland)
+- **Hardware:** RP2040-Zero + 1.69" ST7789 LCD
+
+## Support
+
+☕ [Support on Ko-fi](https://ko-fi.com/jrodriiguezg)
+
+## Author
+
+**Juan Raul Rodriguez Gil** — Built with passion for Linux & Hardware  
+[jrodriiguezg.link](https://jrodriiguezg.link) | [GitHub](https://github.com/jrodriiguezg) | [Instagram](https://www.instagram.com/jrodriiguezg.link/?hl=es)
+
+---
+
+© 2026 Juan Raul Rodriguez Gil