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884f087 2bacf16 38b579d 884f087 38b579d 884f087 2bacf16 884f087 2bacf16 884f087 2bacf16 884f087 38b579d 884f087 2bacf16 884f087 2bacf16 884f087 2bacf16 884f087 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 | <!DOCTYPE html>
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<title>FireGuardian 3000 - Schematic Diagram</title>
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FireGuardian 3000 - Complete Schematic Diagram
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<img src="https://raw.githubusercontent.com/arduino/ArduinoCore-avr/master/schematics/arduino-uno-schematic.png" alt="Arduino Uno Schematic" class="mx-auto mb-4" style="max-width: 800px;">
<img src="https://raw.githubusercontent.com/SeeedDocument/Grove-MQ2_Gas_Sensor/1a9a9a5f8f3e0e5f5a5f5f5f5f5f5f5f5f5f5f5f/res/MQ-2_Schematic.png" alt="MQ-2 Sensor Schematic" class="mx-auto mb-4" style="max-width: 600px;">
<img src="https://raw.githubusercontent.com/arduino-libraries/LiquidCrystal/main/extras/LCD_Schematic.png" alt="LCD Wiring Schematic" class="mx-auto" style="max-width: 600px;">
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<span><strong>Arduino Uno</strong> - Main microcontroller</span>
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<span><strong>MQ-2 Smoke Sensor</strong> - Detects smoke particles</span>
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<span><strong>Piezo Buzzer</strong> - Alarm sound output</span>
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<span><strong>Manual Call Point</strong> - Normally open switch</span>
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<span><strong>16x2 LCD Display</strong> - Status output</span>
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<span><strong>Control Buttons</strong> - Silence and reset</span>
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<i data-feather="zap" class="mr-2"></i> Wiring Guide
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<li><strong>Power:</strong> 9V DC supply (1A minimum) to Arduino barrel jack</li>
<li><strong>Smoke Sensor:</strong> A0 pin (5V and GND connections required)</li>
<li><strong>Manual Call:</strong> D7 with internal pull-up resistor</li>
<li><strong>Alarm Bell:</strong> D8 with 1K current limiting resistor</li>
<li><strong>Silence Button:</strong> D9 with 10K pull-down resistor</li>
<li><strong>Reset Button:</strong> D10 with 10K pull-down resistor</li>
<li><strong>LCD:</strong> RS(D12), E(D11), DB4-DB7(D5-D2) with contrast potentiometer</li>
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<i data-feather="file-text" class="mr-1 w-4 h-4"></i> Schematic PDF
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<i data-feather="file-text" class="mr-1 w-4 h-4"></i> Sensor Schematic
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<i data-feather="file-text" class="mr-1 w-4 h-4"></i> LCD Schematic
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