SGP30 doesn't work on Gen3 devices

Troubleshooting
, ,
25

Sorry for delay, no idea how to post a lib to github… ill get there.

The first thing (after cloning the adafruit library) was to move the .h and .cpp into src. then also created a properties file. Then, not 100% sure if needed, but added the Wire.h as that was in the example.

Capture
Capture719×579 46.9 KB

note: using udp as a workaround for posting my data to InfluxDB whilst Particle tech sort out my webhook issue. Not holding my breath on that though. So, you dont need to call UDP or TCPClient unless posting to web.

Then added the library to properties

Capture
Capture915×647 41.6 KB

Now into SGP30.h and changed it to Particle.h

Capture
Capture1123×849 109 KB

I also had some issues with the default address on my sensor. I think this is the default, but some other makers use slightly different addresses such as 0x5A, 0x45, etc… look yours up, but the image worked for my adafruit branded one.

As for code, this is what is in my SGP30.ino

/*
 * Project SGP30
 * Description:
 * Author:
 * Date:
 */
#include "Particle.h"
#include "Wire.h"
#include "Adafruit_SGP30.h"

Adafruit_SGP30 sgp;


/* return absolute humidity [mg/m^3] with approximation formula
* @param temperature [°C]
* @param humidity [%RH]
*/
uint32_t getAbsoluteHumidity(float temperature, float humidity)
{
  // approximation formula from Sensirion SGP30 Driver Integration chapter 3.15
  const float absoluteHumidity = 216.7f * ((humidity / 100.0f) * 6.112f * exp((17.62f * temperature) / (243.12f + temperature)) / (273.15f + temperature)); // [g/m^3]
  const uint32_t absoluteHumidityScaled = static_cast<uint32_t>(1000.0f * absoluteHumidity);                                                                // [mg/m^3]
  return absoluteHumidityScaled;
}

void setup()
{
  Serial.begin(9600);
  Particle.publish("Argon_002", "SGP30 test", PRIVATE); // Argon_002 can be renamed to whatever you like.

  if (!sgp.begin())
  {
    Particle.publish("Argon_002", "SGP NOT FOUND", PRIVATE);
  }

  String serialString = "SGP30 Serial:";
  serialString += String(sgp.serialnumber[0], HEX);
  serialString += String(sgp.serialnumber[1], HEX);
  serialString += String(sgp.serialnumber[2], HEX);
  Particle.publish("Argon_002", serialString, PRIVATE);
  // If you have a baseline measurement from before you can assign it to start, to 'self-calibrate'
  //sgp.setIAQBaseline(0x8E68, 0x8F41);  // Will vary for each sensor!
}

int counter = 0;
void loop()
{

  /////// CO2 Sensor ///////
  // If you have a temperature / humidity sensor, you can set the absolute humidity to enable the humditiy compensation for the air quality signals
  float temperature = 22.1; // [°C]    <-- SET THESE FROM TEMP/HUMI SENSOR WHEN WORKING
  float humidity = 45.2;    // [%RH]   <-- SET THESE FROM TEMP/HUMI SENSOR WHEN WORKING
  sgp.setHumidity(getAbsoluteHumidity(temperature, humidity));

  if (!sgp.IAQmeasure())
  {
    Particle.publish("Argon_002", "Measurement Failed", PRIVATE);
    return;
  }

  if (!sgp.IAQmeasureRaw())
  {
    //Serial.println("Raw Measurement failed");
    Particle.publish("Argon_002", "Raw Measurement failed", PRIVATE);
    return;
  }
  Particle.publish("Argon_002",String(sgp.eCO2),PRIVATE); // <-- can also call tvoc here. but I'm only interested in co2
  delay(9000);

  counter++;
  if (counter == 30)
  {
    counter = 0;

    uint16_t TVOC_base, eCO2_base;
    if (!sgp.getIAQBaseline(&eCO2_base, &TVOC_base))
    {
      //Serial.println("Failed to get baseline readings");

      Particle.publish("Argon_002", "Failed to get baseline readings", PRIVATE);
      return;
    }
    String baselineString = "****Baseline values: eCO2: 0x";
    baselineString += String(eCO2_base, HEX);
    baselineString += " & TVOC: 0x";
    baselineString += String(TVOC_base, HEX);

    Particle.publish("Argon_002", baselineString, PRIVATE);
  }
  float voltage = analogRead(BATT) * 0.0011224;
}
2 Likes