mirror of https://github.com/arendst/Tasmota.git
70 lines
2.3 KiB
Arduino
70 lines
2.3 KiB
Arduino
|
#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);
|
||
|
|
Serial.println("SGP30 test");
|
||
|
|
|
||
|
|
if (! sgp.begin()){
|
||
|
|
Serial.println("Sensor not found :(");
|
||
|
|
while (1);
|
||
|
|
}
|
||
|
|
Serial.print("Found SGP30 serial #");
|
||
|
|
Serial.print(sgp.serialnumber[0], HEX);
|
||
|
|
Serial.print(sgp.serialnumber[1], HEX);
|
||
|
|
Serial.println(sgp.serialnumber[2], HEX);
|
||
|
|
|
||
|
|
// 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() {
|
||
|
|
// 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));
|
||
|
|
|
||
|
|
if (! sgp.IAQmeasure()) {
|
||
|
|
Serial.println("Measurement failed");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
Serial.print("TVOC "); Serial.print(sgp.TVOC); Serial.print(" ppb\t");
|
||
|
|
Serial.print("eCO2 "); Serial.print(sgp.eCO2); Serial.println(" ppm");
|
||
|
|
|
||
|
|
if (! sgp.IAQmeasureRaw()) {
|
||
|
|
Serial.println("Raw Measurement failed");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
Serial.print("Raw H2 "); Serial.print(sgp.rawH2); Serial.print(" \t");
|
||
|
|
Serial.print("Raw Ethanol "); Serial.print(sgp.rawEthanol); Serial.println("");
|
||
|
|
|
||
|
|
delay(1000);
|
||
|
|
|
||
|
|
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");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
Serial.print("****Baseline values: eCO2: 0x"); Serial.print(eCO2_base, HEX);
|
||
|
|
Serial.print(" & TVOC: 0x"); Serial.println(TVOC_base, HEX);
|
||
|
|
}
|
||
|
|
}
|