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Author: Hug0x0

LE_SUPER_PROGRAMME.ino

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+uint32_t SLEEP_TIME = 30000; 
+float Ro = 10000.0;    
+int val = 0;           
+float valMQ =0.0;
+float lastMQ =0.0;
+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};   
+
+
+void setup()
+{
+    Ro = MQCalibration(
+             A2);         //Calibrating the sensor. Please make sure the sensor is in clean air
+}
+
+void loop()
+{
+    uint16_t valMQ = MQGetGasPercentage(MQRead(A2)/Ro,GAS_CO);
+    Serial.println(val);
+
+    Serial.print("LPG:");
+    Serial.print(MQGetGasPercentage(MQRead(A2)/Ro,GAS_LPG) );
+    Serial.print( "ppm" );
+    Serial.print("    ");
+    Serial.print("CO:");
+    Serial.print(MQGetGasPercentage(MQRead(A2)/Ro,GAS_CO) );
+    Serial.print( "ppm" );
+    Serial.print("    ");
+    Serial.print("SMOKE:");
+    Serial.print(MQGetGasPercentage(MQRead(A2)/Ro,GAS_SMOKE) );
+    Serial.print( "ppm" );
+    Serial.print("\n");
+
+    if (valMQ != lastMQ) {
+        send(msg.set((int16_t)ceil(valMQ)));
+        lastMQ = ceil(valMQ);
+    }
+
+    sleep(SLEEP_TIME); //sleep for: sleepTime
+}
+
+
+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(A2));
+        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(A2));
+        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 (pow(10,( ((log(rs_ro_ratio)-pcurve[1])/pcurve[2]) + pcurve[0])));
+}

Mh_Z19b.ino

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+//The pulseIn Function
+byte PWM_PIN = 3;
+ 
+int pwm_value;
+ 
+void setup() {
+  pinMode(PWM_PIN, INPUT);
+  Serial.begin(115200);
+}
+ 
+void loop() {
+  pwm_value = pulseIn(PWM_PIN, HIGH);
+  Serial.println(pwm_value);
+  delay(1000);
+  
+}