Tasmota/lib/lib_i2c/arduino-i2c-sgp41/examples/exampleUsage/exampleUsage.ino

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/*
 * Copyright (c) 2021, Sensirion AG
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
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 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
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 * * Neither the name of Sensirion AG nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 */

#include <Arduino.h>
#include <SensirionI2CSgp41.h>
#include <Wire.h>

SensirionI2CSgp41 sgp41;

// time in seconds needed for NOx conditioning
uint16_t conditioning_s = 10;

void setup() {

    Serial.begin(115200);
    while (!Serial) {
        delay(100);
    }

    Wire.begin();

    uint16_t error;
    char errorMessage[256];

    sgp41.begin(Wire);

    uint16_t serialNumber[3];
    uint8_t serialNumberSize = 3;

    error = sgp41.getSerialNumber(serialNumber, serialNumberSize);

    if (error) {
        Serial.print("Error trying to execute getSerialNumber(): ");
        errorToString(error, errorMessage, 256);
        Serial.println(errorMessage);
    } else {
        Serial.print("SerialNumber:");
        Serial.print("0x");
        for (size_t i = 0; i < serialNumberSize; i++) {
            uint16_t value = serialNumber[i];
            Serial.print(value < 4096 ? "0" : "");
            Serial.print(value < 256 ? "0" : "");
            Serial.print(value < 16 ? "0" : "");
            Serial.print(value, HEX);
        }
        Serial.println();
    }

    uint16_t testResult;
    error = sgp41.executeSelfTest(testResult);
    if (error) {
        Serial.print("Error trying to execute executeSelfTest(): ");
        errorToString(error, errorMessage, 256);
        Serial.println(errorMessage);
    } else if (testResult != 0xD400) {
        Serial.print("executeSelfTest failed with error: ");
        Serial.println(testResult);
    }
}

void loop() {
    uint16_t error;
    char errorMessage[256];
    uint16_t defaultRh = 0x8000;
    uint16_t defaultT = 0x6666;
    uint16_t srawVoc = 0;
    uint16_t srawNox = 0;

    delay(1000);

    if (conditioning_s > 0) {
        // During NOx conditioning (10s) SRAW NOx will remain 0
        error = sgp41.executeConditioning(defaultRh, defaultT, srawVoc);
        conditioning_s--;
    } else {
        // Read Measurement
        error = sgp41.measureRawSignals(defaultRh, defaultT, srawVoc, srawNox);
    }

    if (error) {
        Serial.print("Error trying to execute measureRawSignals(): ");
        errorToString(error, errorMessage, 256);
        Serial.println(errorMessage);
    } else {
        Serial.print("SRAW_VOC:");
        Serial.print(srawVoc);
        Serial.print("\t");
        Serial.print("SRAW_NOx:");
        Serial.println(srawNox);
    }
}