DropSlot

Real-Time Calendar Integration

DropSlot connects directly to Google Calendar APIs, syncing meeting room status in real time.
If a booking isn’t confirmed within 3 minutes, the event is automatically deleted.

Smart Presence Logic

The button runs a simple, reliable state machine that monitors meeting room activity: free → upcoming → confirmation → in progress. Every press updates both the device state and the cloud record instantly.

Visual Feedback System

DropSlot communicates entirely through color signals:

• Green solid – room free
• Blue pulsing – meeting starts soon (< 5 minutes)
• Red flashing – confirm meeting attendance
• Red solid – meeting in progress

All patterns are handled by onboard LED logic with millisecond precision.

Instant Local Booking

When no meeting is scheduled, pressing DropSlot creates an instant 5-minute reservation.
This quick-book mode integrates seamlessly with Calendar and shows up as “Quick Booking” in your calendar.

Hardware Architecture

Built around an ESP32 microcontroller for Wi-Fi connectivity.
Features common cathode RGB LED (GPIOs 25, 26, 27), capacitive touch button, and PWM control (5kHz, 8-bit).
Power-efficient, designed for 24/7 uptime.

Cloud-Connected & Secure

DropSlot communicates over HTTPS with SHA256 hash-based authentication to the backend.
Server uses caching architecture with 30-second background polling.
Easily scalable for multiple rooms or entire office deployments.