Senti-Scan 2000

The Senti-Scan 2000 is a compact, intelligent security turret that autonomously monitors its surroundings using ultrasonic sensors, delivers real-time threat assessments via LCD, and escalates alerts with custom LED indicators and multi-stage alarm tones. Designed for home security, lab protection, or tactical training, this system combines military-grade responsiveness with Arduino’s versatility.
Supplies
- Arduino Uno
- HC-SR04 Ultrasonic Sensor
- 16x2 Parallel LCD (Non-I2C)
- Active Buzzer
- LEDs (White, Red, Yellow)
- 220Ω Resistors (x3, for LEDs)
- 10K Potentiometer (for LCD contrast)
- Breadboard
- Jumper Wires
🔧 Step-by-Step Build Guide
1. Assemble the Circuit
Wiring Map:
ComponentArduino PinNotes
LCD RS
D7
Register Select
LCD E
D8
Enable
LCD D4-D7
D9-D12
Data pins (4-bit mode)
LCD V0
Pot Middle Pin
Contrast control
LCD A/K
5V/GND
Backlight power
Ultrasonic Trig
D2
HC-SR04 Trigger
Ultrasonic Echo
D3
HC-SR04 Echo
Buzzer (+)
D13
Active buzzer control
White LED (+)
D4 → 220Ω → LED
Standby indicator
Red LED (+)
D5 → 220Ω → LED
Threat indicator
Yellow LED (+)
D6 → 220Ω → LED
Warning indicator
Steps:
- Power Rails: Connect Arduino 5V and GND to breadboard rails.
- LCD Setup:
- Wire RS, E, D4-D7 to Arduino.
- Connect potentiometer outer pins to 5V/GND, middle pin to LCD V0.
- Ultrasonic: Attach Trig/Echo to D2/D3, power to 5V/GND.
- LEDs: Connect each LED through a 220Ω resistor to GND.
- Buzzer: Link (+) to D13, (-) to GND.
2. Upload the Code
- Copy the code
- In Arduino IDE:
- Select Tools → Board → Arduino Uno.
- Tools → Port → [Your Arduino COM Port].
- Click Upload.