Smoke Detector Sensor Using Arduino
In this project, am going to build a smoke detector sensor using Arduino that not only detects the smoke but also reads the level of the smoke in the air and displays it in the PPM.
I will attach all the schematics and the PCBs design for the project. I will start by doing the PCB design for the smoke sensor detector.
Components:
#include
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
#define buzzer 9
#define sensor A0
#define load_Res 10
#define air_factor 9.83
float SmokeCurve[3] ={2.3,0.53,-0.44}; // (x, y, slope) x,y coordinate of one point and the slope between two points
float Res=0;
void setup()
{
lcd.begin(16,2);
lcd.print("Calibrating.....");
Res = SensorCalibration();
lcd.print("Calibration done.");
lcd.setCursor(0,1);
lcd.print("Res=");
lcd.print(Res);
lcd.print("kohm");
delay(2000);
lcd.clear();
pinMode(buzzer, OUTPUT);
}
void loop()
{
lcd.setCursor(0,0);
lcd.print("SMOKE:");
float res=resistance(5,50);
res/=Res;
int result=pow(10,(((log(res)-SmokeCurve[1])/SmokeCurve[2]) + SmokeCurve[0]));
lcd.print(result);
lcd.print( " ppm ");
if(result>1000)
{
digitalWrite(buzzer, HIGH);
delay(2000);
}
else
digitalWrite(buzzer, LOW);
delay(500);
}
float resistance(int samples, int interval)
{
int i;
float res=0;
for (i=0;i {
int adc_value=analogRead(sensor);
res+=((float)load_Res*(1023-adc_value)/adc_value);
delay(interval);
}
res/=samples;
return res;
}
float SensorCalibration()
{
int i;
float val=0;
val=resistance(50,500);
val = val/air_factor;
return val;
}
Components:
- Arduino UNO
- Power Supply
- Smoke Sensor (MQ2)
- Resistors (10K and 1K)
- Buzzer
- 16x2 LCD
- 10k POT
- LED
- LM358
- Burg strips code;
#include
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
#define buzzer 9
#define sensor A0
#define load_Res 10
#define air_factor 9.83
float SmokeCurve[3] ={2.3,0.53,-0.44}; // (x, y, slope) x,y coordinate of one point and the slope between two points
float Res=0;
void setup()
{
lcd.begin(16,2);
lcd.print("Calibrating.....");
Res = SensorCalibration();
lcd.print("Calibration done.");
lcd.setCursor(0,1);
lcd.print("Res=");
lcd.print(Res);
lcd.print("kohm");
delay(2000);
lcd.clear();
pinMode(buzzer, OUTPUT);
}
void loop()
{
lcd.setCursor(0,0);
lcd.print("SMOKE:");
float res=resistance(5,50);
res/=Res;
int result=pow(10,(((log(res)-SmokeCurve[1])/SmokeCurve[2]) + SmokeCurve[0]));
lcd.print(result);
lcd.print( " ppm ");
if(result>1000)
{
digitalWrite(buzzer, HIGH);
delay(2000);
}
else
digitalWrite(buzzer, LOW);
delay(500);
}
float resistance(int samples, int interval)
{
int i;
float res=0;
for (i=0;i
int adc_value=analogRead(sensor);
res+=((float)load_Res*(1023-adc_value)/adc_value);
delay(interval);
}
res/=samples;
return res;
}
float SensorCalibration()
{
int i;
float val=0;
val=resistance(50,500);
val = val/air_factor;
return val;
}
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