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The SGP40 features a "standard" hot plate MOX sensor as well as a small microcontroller that controls the power supply of the board, reads the analog voltage and provides an I2C interface for reading. Unlike the CCS811, this sensor does not require an I2C clock extension. We currently have an Arduino library with examples for reading the raw value and running the Sensirion algorithm to calculate the VOC index, as well as a Python/CircuitPython library that works with Linux computers such as the Raspberry Pi or our CircuitPython boards can be used.
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