Door Sentinel
Door open/close detection with event logging
Watch the circuit build itself: components drop in, wires connect, and the output comes alive.
Components
Everything you need for this project.
1x Tactile push button (as door sensor)
1x 10KΩ resistor
1x Red LED
1x Active buzzer
1x 220Ω resistor
5x jumper wires
How It Works
Digital input with pull-up resistors, interrupt-driven programming, event logging, and debouncing.
What You Build
Button simulates a door reed switch on D1, LED on D2, buzzer on D3. Each "door open" event is logged with timestamp.
African Context
Door and entry monitoring is used in warehouses, pharmacies, and school supply rooms. Event logging teaches the foundation of security audit trails.
What You'll See
Pressing the button simulates door opening: LED lights, buzzer sounds, event logged on display with timestamp.