adds sgp30

Author: tablatronix

sense_env.h

@@ -52,18 +52,20 @@ Average<float> avg_a(20);
 // I2C
 
 //MOTION
-#defineMPU6050// MPU 6050 GY521 3axis gyro/accel
-#defineHMC5883L// NI Honeywell HMC5883L
-#defineMLX90393// 3 axis magnetometer
+//#define MPU6050 // MPU 6050 GY521 3axis gyro/accel
+//#define HMC5883L // NI Honeywell HMC5883L
+//#define MLX90393 // 3 axis magnetometer
 
 // TEMP/HUMIDITY/GAS
-#defineSI7021
+//#define SI7021
 
-#defineAHTX0
+// #define AHTX0
+
+#defineSGP30
 
 // Sensiron
-#defineUSESHT31// SHT31 Temp/Humidity
-#defineUSESHT21// SHT21 / HTU21D Temp/Humidity
+//#define USESHT31 // SHT31 Temp/Humidity
+//#define USESHT21 // SHT21 / HTU21D Temp/Humidity
 
 
 // BOSCH
@@ -77,19 +79,19 @@ Up to 0.03hPa / 0.25m resolution
 -40 to +85°C operational range, +-2°C temperature accuracy
 This board/chip uses I2C 7-bit address 0x77.
 */
-#defineUSEBMP280// BMP280 Temp/Pressure/Altitude (upgrade for BMP085/BMP180/BMP183)
+//#define USEBMP280 // BMP280 Temp/Pressure/Altitude (upgrade for BMP085/BMP180/BMP183)
 // #define USEBME280 // BME280 Humidity/Pressure/Altitude
 // Pressure: 300...1100 hPa
 
-#defineSDC4X// SDC40 Co2/Temp/Humidity
-#defineUSECS811// CCS811 Temp/CO2/VOC
+//#define SDC4X // SDC40 Co2/Temp/Humidity
+//#define USECS811 // CCS811 Temp/CO2/VOC
 // #define USEGP2Y // Sharp Particle/Dust sensor GP2Y1010AU0F, GP2Y1014AU0F
-#definePMSx
+//#define PMSx
 
 // LIGHT
-#defineAPDS9960// Proximity, Light, RGB, and Gesture Sensor
+//#define APDS9960 // Proximity, Light, RGB, and Gesture Sensor
 
-#defineUSEBH1750// Light Sensor
+//#define USEBH1750 // Light Sensor
 /*
  BH1750 has six different measurement modes. They are divided in two groups;
  continuous and one-time measurements. In continuous mode, sensor continuously
@@ -120,7 +122,7 @@ This board/chip uses I2C 7-bit address 0x77.
  BH1750_ONE_TIME_HIGH_RES_MODE_2
 */
 
-#defineVEML6070// UV Sensor
+//#define VEML6070 // UV Sensor
 
 
 // #define TSL2561 // Luminosity/Lux/Light Address = 0x39 //Slave addr also 0x29 or 0x49
@@ -144,15 +146,15 @@ Interface: I2C
 */
 
 // SOUND
-#defineMAX9814// MAX9814 Auto GC amplifier
-#defineMAX4466// MAX4466 Adj GC amplifier
+//#define MAX9814 // MAX9814 Auto GC amplifier
+//#define MAX4466 // MAX4466 Adj GC amplifier
 
 // Energy
-#defineINA219// INA219 current sense
+//#define INA219 // INA219 current sense
 
 // IO
-#defineMCP4725// 12bit DAC with EEPROM
-#defineMCP3421// 18bit delta-sigma ADC
+//#define MCP4725 // 12bit DAC with EEPROM
+//#define MCP3421 // 18bit delta-sigma ADC
 // #define PCF8591 // PCF8591 io expander
 
 
@@ -1401,4 +1403,84 @@ float get_aht(uint8_t channel = 0){
 }
 #endif
 
+
+
+#ifdef SGP30
+#include"Adafruit_SGP30.h"
+Adafruit_SGP30 sgp;
+
+voidinit_sgp30(){
+bool ret = false;
+ ret = sgp.begin();
+if(!ret){
+ Logger.println("[ERROR] _sgp30 init FAILED");
+ }
+else Logger.println("[ENV] _sgp30 is ACTIVE");
+
+// 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! 
+// return ret; 
+
+// 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]
+//float humidity = 45.2; // [%RH]
+//sgp.setHumidity(getAbsoluteHumidity(temperature, humidity));
+
+}
+
+voidprint_sgp30(){
+ Logger.print("Found SGP30 serial #");
+ Logger.print(sgp.serialnumber[0], HEX);
+ Logger.print(sgp.serialnumber[1], HEX);
+ Logger.println(sgp.serialnumber[2], HEX);
+
+if (! sgp.IAQmeasure()){
+ Logger.println("Measurement failed");
+return;
+ }
+ Logger.print("TVOC "); Logger.print(sgp.TVOC); Logger.println(" ppb\t");
+ Logger.print("eCO2 "); Logger.print(sgp.eCO2); Logger.println(" ppm");
+
+if (! sgp.IAQmeasureRaw()){
+ Logger.println("Raw Measurement failed");
+return;
+ }
+ Logger.print("Raw H2 "); Logger.println(sgp.rawH2);
+ Logger.print("Raw Ethanol "); Logger.println(sgp.rawEthanol);
+
+uint16_t TVOC_base, eCO2_base;
+if (! sgp.getIAQBaseline(&eCO2_base, &TVOC_base)){
+ Logger.println("Failed to get baseline readings");
+return;
+ }
+ Logger.print("****Baseline values: \neCO2: 0x"); Logger.println(eCO2_base, HEX);
+ Logger.print("TVOC: 0x"); Logger.println(TVOC_base, HEX); 
+}
+
+floatget_sgp30(uint8_t channel = 0){
+print_sgp30();
+if(sgp.IAQmeasure()){
+if(channel == 0) return sgp.TVOC;
+if(channel == 1) return sgp.eCO2;
+
+if(sgp.IAQmeasureRaw()){
+if(channel == 2) return sgp.rawH2;
+if(channel == 3) return sgp.rawEthanol;
+ }
+ }
+// else "error"
+}
+#endif
+
+/* return absolute humidity [mg/m^3] with approximation formula
+* @param temperature [°C]
+* @param humidity [%RH]
+*/
+uint32_tgetAbsoluteHumidity(float temperature, float humidity){
+// approximation formula from Sensirion SGP30 Driver Integration chapter 3.15
+constfloat absoluteHumidity = 216.7f * ((humidity / 100.0f) * 6.112f * exp((17.62f * temperature) / (243.12f + temperature)) / (273.15f + temperature)); // [g/m^3]
+constuint32_t absoluteHumidityScaled = static_cast<uint32_t>(1000.0f * absoluteHumidity); // [mg/m^3]
+return absoluteHumidityScaled;
+}
+
 #endif