FireGuardian 3000 - Complete Schematic Diagram

Back
Arduino Uno Schematic MQ-2 Sensor Schematic LCD Wiring Schematic
Download Schematic (PNG)

Components Legend

  • Arduino Uno - Main microcontroller
  • MQ-2 Smoke Sensor - Detects smoke particles
  • Piezo Buzzer - Alarm sound output
  • Manual Call Point - Normally open switch
  • 16x2 LCD Display - Status output
  • Control Buttons - Silence and reset

Wiring Guide

  • Power: 9V DC supply (1A minimum) to Arduino barrel jack
  • Smoke Sensor: A0 pin (5V and GND connections required)
  • Manual Call: D7 with internal pull-up resistor
  • Alarm Bell: D8 with 1K current limiting resistor
  • Silence Button: D9 with 10K pull-down resistor
  • Reset Button: D10 with 10K pull-down resistor
  • LCD: RS(D12), E(D11), DB4-DB7(D5-D2) with contrast potentiometer

Download Resources

Schematic PDF Sensor Schematic LCD Schematic