🚦 Smart Office Status Light

An automated "Do Not Disturb" light for your workspace powered by ESP32. It automatically changes the color of an LED strip based on your Google Calendar status and your physical Presence (detected via Bluetooth Low Energy).

✨ Features

• Fully Autonomous: No external servers (Home Assistant/MQTT) required. Runs entirely on the ESP32.
• Presence Detection: Uses your smartphone as an iBeacon. The light reacts instantly when you walk in or out.
• Google Calendar Sync: Checks your schedule in real-time. If you have a meeting, the light turns Red.
• Non-Invasive: Controls standard 12V RGB LED strips via Infrared (IR). No need to cut wires or solder into the strip controller.
• Smart Logic:
  • 🟢 Green: You are present and Free (no events).
  • 🔴 Red: You are Busy (meeting) OR you have been away for > 15 mins.
  • 🟡 Yellow: You stepped away for a short break (< 15 mins).
  • 🌈 Fade / Off: End of the work day (absent > 4 hours).

🛠 Hardware Required

1. ESP32 Development Board (e.g., ESP32 DevKit V1, NodeMCU-32S).
2. IR LED (940nm, 5mm recommended).
3. Resistor (100 Ohm or 220 Ohm).
4. Standard RGB LED Strip with an IR Remote.
5. Android/iOS Smartphone.

Wiring

A simple circuit to emulate the remote control:

• ESP32 GPIO 4 (or any digital pin) --> Resistor --> IR LED Anode (+)
• ESP32 GND --> IR LED Cathode (-)

---

🚀 Installation & Setup

1. Google Apps Script (The API)

To let the ESP32 check your calendar securely without complex OAuth, we use a simple Google Script proxy.

1. Go to script.google.com and create a New Project.
2. Paste the following code:

   function doGet(e) {
     var cal = CalendarApp.getDefaultCalendar();
     var now = new Date();
     var events = cal.getEventsForDay(now);
     var status = "FREE";
     
     for (var i = 0; i < events.length; i++) {
       var start = events[i].getStartTime();
       var end = events[i].getEndTime();
       // Check if current time is within an event
       if (now >= start && now <= end) {
         status = "BUSY";
         break;
       }
     }
     return ContentService.createTextOutput(status);
   }

3. Click Deploy -> New Deployment.
4. Select type: Web app.
5. Important: Set "Who has access" to "Anyone".
6. Click Deploy and copy the generated Web App URL (ends with /exec).

2. Smartphone Setup (The Beacon)

1. Install a Beacon app (e.g., "Beacon Simulator" for Android).
2. Create a new iBeacon.
3. Enable broadcasting.
4. Note down the UUID or use the scanner sketch provided in this repo to find your unique ID.

3. ESP32 Firmware

1. Install Arduino IDE.
2. Install required libraries via Library Manager:
   • NimBLE-Arduino (Crucial for memory optimization with SSL).
   • IRremote (By Armin Joachimsmeyer).
3. Open main.ino.
4. Edit the Configuration Section at the top:
   • Wi-Fi Credentials.
   • Google Script URL.
   • Your Beacon ID.
   • IR Codes (if your remote differs from the NEC standard used here).
5. Select Board: ESP32 Dev Module.
6. Select Partition Scheme: Huge APP (3MB No OTA) (Required to fit SSL + BLE).
7. Upload!

---

🔧 Troubleshooting

• Google Error -1: This usually means "Out of Memory". Ensure you are using the NimBLE library instead of the standard BLEDevice, and that you selected the "Huge APP" partition scheme.
• Light not reacting: Check the IR LED polarity and ensure it points towards the LED strip controller. You may need to update the IR HEX codes in the sketch (use the IRrecvDump example from the IRremote library to decode your specific remote).
• Compilation Error: Ensure you are using ESP32 Board version 2.0.17 or compatible. Versions 3.0+ might require syntax adjustments.

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.