abnormal measurements

[matigumma]

Describe the bug
high values on measurements

im using:
nodemcu v1.0 (cp2102)

grove multi sensor v2

code:

#include <Multichannel_Gas_GMXXX.h>
#include <Wire.h>

GAS_GMXXX<TwoWire> gas;

unsigned int no2, c2h5ch, voc, co;

void setup() {

  Serial.begin(115200);
  gas.begin(Wire, 0x08);

}
void loop() {

//VOC
  voc = gas.getGM502B();
  Serial.print("VOC: ");
  Serial.print(voc);
  Serial.print(" ppm");Serial.print("  =  ");Serial.print(gas.calcVol(voc)); Serial.println("V");
  //CO
  co = gas.getGM702B();
  if (co > 999) co = 999;
  Serial.print("CO: ");
  Serial.print(co);
  Serial.print(" ppm");Serial.print("  =  ");Serial.print(gas.calcVol(co)); Serial.println("V");
  
  //NO2
  no2 = gas.getGM102B();
  if (no2 > 999) no2 = 999;
  Serial.print("NO2: ");
  Serial.print(no2);
  Serial.print(" ppm");Serial.print("  =  ");Serial.print(gas.calcVol(no2)); Serial.println("V");

  //C2H5CH
  c2h5ch = gas.getGM302B();
  if (c2h5ch > 999) c2h5ch = 999;
  Serial.print("C2H5CH: ");
  Serial.print(c2h5ch);
  Serial.print(" ppm");Serial.print("  =  ");Serial.print(gas.calcVol(c2h5ch)); Serial.println("V");

  Serial.println("----------------------------------------------------------------");
  delay(2000);
}

and i getting this as result :img attached

[Pillar1989]

@matigumma I don't see exaggerated anomalous data.

[nor2101]

@matigumma those are not ppm. The value returned for all gases is in raw adc points, which for some reason are named as "eq" in the example files. If you need ppm values you need to calculate them yourself from the raw adc values.

[moemuses]

@Pillar1989 @nor2101 Can you please explain more how we can calculate ppm from "eq" ?

[lakshanthad]

@matigumma

Please follow this:
#5