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Smoke Detector Arduino Shield

2 years ago 3473
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Description

This Smoke Detector Circuit sense the smoke in the air and displays the level of smoke in PPM (parts per million) on LCD display. This circuit triggers the Buzzer when Smoke level becomes higher than 1000 ppm, this threshold value can be changed in the code according to the requirement. This circuit mainly uses MQ2 Smoke/Gas sensor and Arduino to detect and calculate the level of smoke. MQ2 gas sensor is also sensible to LPG, Alcohol, and Methane etc.

In the schematic diagram, we have a comparator circuit for comparing output voltage of smoke sensor with preset voltage (output connected at pin D7). Also smoke sensor output is connected at an analog pin of Arduino (A0). Buzzer is connected at Pin D9. And LCD connections are same as Arduino LCD examples that are available in Arduino IDE (12, 11, 5, 4, 3, 2). Remaining connections are shown in the circuit diagram.

For the complete DIY project and step by step guide to build this project, check out the project page on circuit digest.

Documents

MQ2 Smoke Detector Arduino Shield Circuit

MQ2 Smoke Detector Arduino Shield

Smoke Detector PCB

New PCB

Smoke Detector PPM PCB

BOM

ID Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier Supplier Part Price LCSC Assembly Mounted SeeedStudio
1 ARDUINO_R3_SHIELD J1 UNO_R3_SHIELD 1
2 LCD-16X2 U1 LCD-16X2 1
3 10k R1,R3 TRIM_POT_PTH 2
4 1k R2,R4,R5,R7 R1206 4 RC1206FR-071RL SeeedStudio 301010433
5 LM358 U2 DIP8 1
6 P125-1103A0BS116A1 J2 H3-2.54 1 P125-1103A0BS116A1 SeeedStudio 320020038
7 19-217-R6C-AL1M2VY-3T D1,D2 Seeed-LED-0603 2 19-217-R6C-AL1M2VY-3T SeeedStudio 304090042
8 Smoke Module J3 H4-2.54 1 F185-1104A1BSYA1 SeeedStudio 320030017
9 Smoke_SENSOR U3 MQ-3 1
10 BUZZER SG1 BUZZER-12MM 1
11 BC547 U4 Seeed-SOT-23 1 MMBT3904LT1G SeeedStudio 305010013
12 10k R6,R8 R1206 2 RC1206FR-071RL SeeedStudio 301010433

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