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An extended SCD30 library based on the SparkFun SCD30 CO2 Sensor Library, see information below

• tested on UNO R4 WiFI with Wire (5V): Works correct unmodified.
• tested on UNO R4 WIFI with QWICC/Wire1 (3v3) : WORKS but needs more time to warm up /get stable
  

• added option autoCalibrate to begin() to enable disable auto calibration (contribution of jhengstermann)
• begin(TwoWire &wirePort = Wire, bool m_begin = true, boolean autoCalibrate = true);
• wirePort : I2C channel to use. Wire by default.
• m_begin : if true will start measurement every 2 seconds. True / start by default.
• autoCalibrate : if true will enable or false disable autocalibrate at begin. True / Enable ASC by default.

• solved a conflict with ByteToFloat when using SPS30 at the same time

• Update in readmeasurement to translate byte to float. It did not work on Arduino. Tested on Uno, Artemis Apollo3, ESP32
• added example4 to manual input temperature offset and see impact.
• SECOND UPDATE IN OCTOBER
• Added example5 to work with Sparkfun LCD
• update to example4 to set and calibrate temperature offset

Changes based on Datasheet May 2020

• added functions : getForceRecalibration, getMeasurementInterval, getTemperatureOffset, getAltitudeCompensation, getFirmwareLevel
• updated the keywords.txt file
• added example14 to demonstrate the new functions
• A number of library enhancements
• updated sketches and library where needed

Changes:

• Added option in examples 10 and 13 to set BME280 I2C address. (some use 0x76 instead of 0x77)
• Added SoftWire (a port of the ESP8266 I2C library) for ESP32 (which does NOT support clockstretching)
• Removed StartSingleMeasurement as that is not working in the SCD30 as it should.
• Added option to begin() to disable starting measurement. (needed in case one wants to read serial number)
• updated the keywords.txt file
• updated sketches and library where needed

Changes:

• Added ESP8266 board detection in begin() to support the ESP8266 clockstretching
• Added setting debug messages
• Added obtaining serial number of SCD30
• Added StopMeasurement
• Added StartSingleMeasurement (removed February 2019 as it IS unstable)
• Added GetTemperature in Fahrenheit
• Added CRC checks on different places in de driver
• Updated existing sketches fom Sparkfun to new library
• Added new sketches : Example 10: combined read with BME280 Example 11: Set ESP8266 as Access Point and read SCD30 in browser Example 12: Set ESP8266 as WIFI server and read SCD30 in browser

More work to be follow on connecting / comparing with other sensors and document the learnings.

check for updated datasheet and information on

============= ORIGINAL INFORMATION FROM SPARKFUN ===========================

SparkX CO₂ Humidity and Temperature Sensor - SCD30 (SPX-14751)

The SCD30 from Sensirion is a high quality NDIR based CO₂ sensor capable of detecting 400 to 10000ppm with an accuracy of ±(30ppm+3%). In order to improve accuracy the SCD30 has temperature and humidity sensing built-in, as well as commands to set the current altitude.

We've written an Arduino library to make reading the CO₂, humidity, and temperature very easy. It can be downloaded through the Arduino Library manager: search for 'SparkFun SCD30'. We recommend using a Qwiic Breadboard Cable to connect the SCD30 to a Qwiic compatible board. The YeLLow wire goes in the SCL pin. The SCD30 also supports a serial interface but we haven't worked with it.

The CO₂ sensor works very well and for additional accuracy the SCD30 accepts ambient pressure readings. We recommend using the SCD30 in conjunction with the Qwiic Pressure Sensor - MS5637 or the Qwiic Environmental Sensor - BME680 to obtain the current barometric pressure.

Note: The SCD30 has an automatic self-calibration routine. Sensirion recommends 7 days of continuous readings with at least 1 hour a day of 'fresh air' for self-calibration to complete.

Library written by Nathan Seidle (SparkFun).

• /examples - Example sketches for the library (.ino). Run these from the Arduino IDE.
• /src - Source files for the library (.cpp, .h).
• keywords.txt - Keywords from this library that will be highlighted in the Arduino IDE.
• library.properties - General library properties for the Arduino package manager.

• Installing an Arduino Library Guide - Basic information on how to install an Arduino library.

This product is open source!

Various bits of the code have different licenses applied. Anything SparkFun wrote is beerware; if you see me (or any other SparkFun employee) at the local, and you've found our code helpful, please buy us a round!

Please use, reuse, and modify these files as you see fit. Please maintain attribution to SparkFun Electronics and release anything derivative under the same license.

Distributed as-is; no warranty is given.

• Your friends at SparkFun.