Nikhil NairAnirudh kanfadeMeghana RTexas Instruments University Program
Published

Wood Gas Generator (Energy From Waste)

Generation of wood gas (fuel) using waste around us.

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Wood Gas Generator (Energy From Waste)

Things used in this project

Hardware components

MSP-EXP430G2 MSP430 LaunchPad
Texas Instruments MSP-EXP430G2 MSP430 LaunchPad
×1
Grove - Gas Sensor(MQ2)
Seeed Studio Grove - Gas Sensor(MQ2)
×1

Software apps and online services

Energia
Texas Instruments Energia

Story

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Code

Hydrogen Concentration

C/C++
const int AOUTpin=0;//the AOUT pin of the hydrogen sensor goes into analog pin A0 of the arduino

int limit;
int value;

void setup() {
Serial.begin(9600);//sets the baud rate
}

void loop()
{
value= analogRead(AOUTpin);//reads the analaog value from the hydrogen sensor's AOUT pin
Serial.print("Hydrogen value: ");
Serial.println(value);//prints the hydrogen value
delay(100);
}

Smoke Concentration in PPM

C/C++
#define         MQ_PIN                       (2)
#define         RL_VALUE                     (5) 
#define         RO_CLEAN_AIR_FACTOR          (9.83)
#define         CALIBARAION_SAMPLE_TIMES     (50)
#define         CALIBRATION_SAMPLE_INTERVAL  (500)
#define         READ_SAMPLE_INTERVAL         (50)
#define         READ_SAMPLE_TIMES            (5) 
                                                     
#define         GAS_LPG                      (0)
#define         GAS_CO                       (1)
#define         GAS_SMOKE                    (2)

float           LPGCurve[3]  =  {2.3,0.21,-0.47};                                               
float           COCurve[3]  =  {2.3,0.72,-0.34};
float           SmokeCurve[3] = {2.3,0.53,-0.44};                                                     
float           Ro =  10;

void setup()
{
  Serial.begin(9600); 
  Serial.print("Calibrating...\n");                
  Ro = MQCalibration(MQ_PIN);                
  Serial.print("Calibration is done...\n"); 
  Serial.print("Ro=");
  Serial.print(Ro);
  Serial.print("kohm");
  Serial.print("\n");
}

void loop()
{
   Serial.print("LPG:"); 
   Serial.print(MQGetGasPercentage(MQRead(MQ_PIN)/Ro,GAS_LPG) );
   Serial.print( "ppm" );
   Serial.print("    ");   
   Serial.print("CO:"); 
   Serial.print(MQGetGasPercentage(MQRead(MQ_PIN)/Ro,GAS_CO) );
   Serial.print( "ppm" );
   Serial.print("    ");   
   Serial.print("SMOKE:"); 
   Serial.print(MQGetGasPercentage(MQRead(MQ_PIN)/Ro,GAS_SMOKE) );
   Serial.print( "ppm" );
   Serial.print("\n");
   delay(500);
}

float MQResistanceCalculation(int raw_adc)
{
  return ( ((float)RL_VALUE*(1023-raw_adc)/raw_adc));
}

float MQCalibration(int mq_pin)
{
  int i;
  float val=0;
  for (i=0;i<CALIBARAION_SAMPLE_TIMES;i++) {
    val += MQResistanceCalculation(analogRead(mq_pin));
    delay(CALIBRATION_SAMPLE_INTERVAL);
  }
  val = val/CALIBARAION_SAMPLE_TIMES; 
  val = val/RO_CLEAN_AIR_FACTOR;
  return val; 
}

float MQRead(int mq_pin)
{
  int i;
  float rs=0;
  for (i=0;i<READ_SAMPLE_TIMES;i++) {
    rs += MQResistanceCalculation(analogRead(mq_pin));
    delay(READ_SAMPLE_INTERVAL);
  }
  rs = rs/READ_SAMPLE_TIMES;
  return rs;  
}
 
int MQGetGasPercentage(float rs_ro_ratio, int gas_id)
{
  if ( gas_id == GAS_LPG ) {
     return MQGetPercentage(rs_ro_ratio,LPGCurve);
  } else if ( gas_id == GAS_CO ) {
     return MQGetPercentage(rs_ro_ratio,COCurve);
  } else if ( gas_id == GAS_SMOKE ) {
     return MQGetPercentage(rs_ro_ratio,SmokeCurve);
  }    
  return 0;
}

int  MQGetPercentage(float rs_ro_ratio, float *pcurve)
{
  return (powf(10,( ((logf(rs_ro_ratio)-pcurve[1])/pcurve[2]) + pcurve[0])));
}

Credits

Nikhil Nair

Nikhil Nair

1 project • 1 follower
Anirudh kanfade

Anirudh kanfade

1 project • 0 followers
Meghana R

Meghana R

1 project • 4 followers
Texas Instruments University Program

Texas Instruments University Program

91 projects • 119 followers
TI helps students discover what's possible to engineer their future.

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