MQ135 AirQuality Sensor migrate sketch to MySensors 2.0
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hello,
i would like to build a MQ135 AirQuality Sensor. The sketch i have found from empierre ist not compatible with the 2.0 libery. I don`t know what i musst change on this sketch. Can anyone help me?
/* Arduino MQ135 connect the sensor as follows : A H A >>> 5V B >>> A0 H >>> GND B >>> 10K ohm >>> GND Contribution: epierre Based on David Gironi http://davidegironi.blogspot.fr/2014/01/cheap-co2-meter-using-mq135-sensor-with.html http://skylink.dl.sourceforge.net/project/davidegironi/avr-lib/avr_lib_mq135_01.zip */ #include <SPI.h> #include <MySensor.h> #include <Wire.h> #define CHILD_ID_AIQ 0 #define AIQ_SENSOR_ANALOG_PIN 0 #define MQ135_DEFAULTPPM 399 //default ppm of CO2 for calibration #define MQ135_DEFAULTRO 68550 //default Ro for MQ135_DEFAULTPPM ppm of CO2 #define MQ135_SCALINGFACTOR 116.6020682 //CO2 gas value #define MQ135_EXPONENT -2.769034857 //CO2 gas value #define MQ135_MAXRSRO 2.428 //for CO2 #define MQ135_MINRSRO 0.358 //for CO2 unsigned long SLEEP_TIME = 30000; // Sleep time between reads (in seconds) //VARIABLES float mq135_ro = 10000.0; // this has to be tuned 10K Ohm int val = 0; // variable to store the value coming from the sensor float valAIQ =0.0; float lastAIQ =0.0; MySensor gw; MyMessage msg(CHILD_ID_AIQ, V_LEVEL); void setup() { gw.begin(); // Send the sketch version information to the gateway and Controller gw.sendSketchInfo("AIQ Sensor MQ135", "1.0"); // Register all sensors to gateway (they will be created as child devices) gw.present(CHILD_ID_AIQ, S_AIR_QUALITY); } /* * get the calibrated ro based upon read resistance, and a know ppm */ long mq135_getro(long resvalue, double ppm) { return (long)(resvalue * exp( log(MQ135_SCALINGFACTOR/ppm) / MQ135_EXPONENT )); } /* * get the ppm concentration */ double mq135_getppm(long resvalue, long ro) { double ret = 0; double validinterval = 0; validinterval = resvalue/(double)ro; if(validinterval<MQ135_MAXRSRO && validinterval>MQ135_MINRSRO) { ret = (double)MQ135_SCALINGFACTOR * pow( ((double)resvalue/ro), MQ135_EXPONENT); } return ret; } void loop() { uint16_t valr = analogRead(AIQ_SENSOR_ANALOG_PIN);// Get AIQ value Serial.println(val); uint16_t val = ((float)22000*(1023-valr)/valr); //during clean air calibration, read the Ro value and replace MQ135_DEFAULTRO value with it, you can even deactivate following function call. mq135_ro = mq135_getro(val, MQ135_DEFAULTPPM); //convert to ppm (using default ro) valAIQ = mq135_getppm(val, MQ135_DEFAULTRO); Serial.print ( "Val / Ro / value:"); Serial.print ( val); Serial.print ( " / "); Serial.print ( mq135_ro); Serial.print ( " / "); Serial.print ( valAIQ); if (valAIQ != lastAIQ) { gw.send(msg.set(MQ135_DEFAULTPPM+(int)ceil(valAIQ))); lastAIQ = ceil(valAIQ); } // Power down the radio. Note that the radio will get powered back up // on the next write() call. gw.sleep(SLEEP_TIME); //sleep for: sleepTime } /***************************** MQGetPercentage ********************************** Input: rs_ro_ratio - Rs divided by Ro pcurve - pointer to the curve of the target gas Output: ppm of the target gas Remarks: By using the slope and a point of the line. The x(logarithmic value of ppm) of the line could be derived if y(rs_ro_ratio) is provided. As it is a logarithmic coordinate, power of 10 is used to convert the result to non-logarithmic value. ************************************************************************************/ int MQGetPercentage(float rs_ro_ratio, float ro, float *pcurve) { return (double)(pcurve[0] * pow(((double)rs_ro_ratio/ro), pcurve[1])); }
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@scaleoblack
Try this
/* Arduino MQ135 connect the sensor as follows : A H A >>> 5V B >>> A0 H >>> GND B >>> 10K ohm >>> GND Contribution: epierre Based on David Gironi http://davidegironi.blogspot.fr/2014/01/cheap-co2-meter-using-mq135-sensor-with.html http://skylink.dl.sourceforge.net/project/davidegironi/avr-lib/avr_lib_mq135_01.zip */ // Enable debug prints #define MY_DEBUG // Enable and select radio type attached #define MY_RADIO_NRF24 //#define MY_RADIO_RFM69 // #include <SPI.h> //#include <MySensor.h> #include <MySensors.h> #include <Wire.h> #define CHILD_ID_AIQ 0 #define AIQ_SENSOR_ANALOG_PIN 0 #define MQ135_DEFAULTPPM 399 //default ppm of CO2 for calibration #define MQ135_DEFAULTRO 68550 //default Ro for MQ135_DEFAULTPPM ppm of CO2 #define MQ135_SCALINGFACTOR 116.6020682 //CO2 gas value #define MQ135_EXPONENT -2.769034857 //CO2 gas value #define MQ135_MAXRSRO 2.428 //for CO2 #define MQ135_MINRSRO 0.358 //for CO2 unsigned long SLEEP_TIME = 30000; // Sleep time between reads (in seconds) //VARIABLES float mq135_ro = 10000.0; // this has to be tuned 10K Ohm int val = 0; // variable to store the value coming from the sensor float valAIQ =0.0; float lastAIQ =0.0; // MySensor gw; MyMessage msg(CHILD_ID_AIQ, V_LEVEL); void setup() { // gw.begin(); // Send the sketch version information to the gateway and Controller // gw.sendSketchInfo("AIQ Sensor MQ135", "1.0"); // Register all sensors to gateway (they will be created as child devices) // gw.present(CHILD_ID_AIQ, S_AIR_QUALITY); } void presentation() { // Send the sketch version information to the gateway and Controller sendSketchInfo("AIQ Sensor MQ135", "1.0"); // Register all sensors to gw (they will be created as child devices) present(CHILD_ID_AIQ, S_AIR_QUALITY); } /* * get the calibrated ro based upon read resistance, and a know ppm */ long mq135_getro(long resvalue, double ppm) { return (long)(resvalue * exp( log(MQ135_SCALINGFACTOR/ppm) / MQ135_EXPONENT )); } /* * get the ppm concentration */ double mq135_getppm(long resvalue, long ro) { double ret = 0; double validinterval = 0; validinterval = resvalue/(double)ro; if(validinterval<MQ135_MAXRSRO && validinterval>MQ135_MINRSRO) { ret = (double)MQ135_SCALINGFACTOR * pow( ((double)resvalue/ro), MQ135_EXPONENT); } return ret; } void loop() { uint16_t valr = analogRead(AIQ_SENSOR_ANALOG_PIN);// Get AIQ value Serial.println(val); uint16_t val = ((float)22000*(1023-valr)/valr); //during clean air calibration, read the Ro value and replace MQ135_DEFAULTRO value with it, you can even deactivate following function call. mq135_ro = mq135_getro(val, MQ135_DEFAULTPPM); //convert to ppm (using default ro) valAIQ = mq135_getppm(val, MQ135_DEFAULTRO); Serial.print ( "Val / Ro / value:"); Serial.print ( val); Serial.print ( " / "); Serial.print ( mq135_ro); Serial.print ( " / "); Serial.print ( valAIQ); if (valAIQ != lastAIQ) { // gw.send(msg.set(MQ135_DEFAULTPPM+(int)ceil(valAIQ))); send(msg.set(MQ135_DEFAULTPPM+(int)ceil(valAIQ))); lastAIQ = ceil(valAIQ); } // Power down the radio. Note that the radio will get powered back up // on the next write() call. //gw.sleep(SLEEP_TIME); //sleep for: sleepTime sleep(SLEEP_TIME); //sleep for: sleepTime } /***************************** MQGetPercentage ********************************** Input: rs_ro_ratio - Rs divided by Ro pcurve - pointer to the curve of the target gas Output: ppm of the target gas Remarks: By using the slope and a point of the line. The x(logarithmic value of ppm) of the line could be derived if y(rs_ro_ratio) is provided. As it is a logarithmic coordinate, power of 10 is used to convert the result to non-logarithmic value. ************************************************************************************/ int MQGetPercentage(float rs_ro_ratio, float ro, float *pcurve) { return (double)(pcurve[0] * pow(((double)rs_ro_ratio/ro), pcurve[1])); }
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thank you. it works:)
