Struct Measurement 

pub struct Measurement {
    pub co2_ppm: u16,
    pub temperature_raw: u16,
    pub humidity_raw: u16,
}

One SCD4x measurement, as the three words of read_measurement.

The temperature and humidity words are kept raw so the decode stays exact; the methods convert them.

Fields

co2_ppm: u16

The CO2 concentration in parts per million (word[0]).

temperature_raw: u16

The 16-bit temperature word (word[1]).

humidity_raw: u16

The 16-bit humidity word (word[2]).

Implementations

impl Measurement

pub fn parse(frame: &[u8; 9]) -> Result<Measurement, SensorError>

Parses the nine bytes read after command::READ_MEASUREMENT.

Table 11: CO2, temperature, and humidity words in that order, each most significant byte first and followed by its CRC.

Arguments

• frame - the nine response bytes.

Returns

The measurement.

Errors

Returns SensorError::Crc if any of the three CRC bytes does not match its word.

pub fn from_physical( co2_ppm: u16, milli_celsius: i32, humidity_milli_percent: u32, ) -> Measurement

Builds a measurement from physical values.

The inverse of the decode methods, so a node can be fed the frame a sensor would send for a chosen reading.

Arguments

• co2_ppm - the CO2 concentration in ppm.
• milli_celsius - the temperature in milli-degrees Celsius.
• humidity_milli_percent - the relative humidity in milli-percent.

Returns

The measurement with its raw words built by temperature_raw and humidity_raw.

pub fn to_bytes(&self) -> [u8; 9]

Builds the nine bytes a sensor sends for this measurement.

The inverse of Measurement::parse.

Returns

The three word frames, each word followed by its CRC.

pub fn milli_celsius(&self) -> i32

Returns the temperature in milli-degrees Celsius.

pub fn celsius(&self) -> f32

Returns the temperature in degrees Celsius.

pub fn humidity_milli_percent(&self) -> u32

Returns the relative humidity in milli-percent.

pub fn relative_humidity_percent(&self) -> f32

Returns the relative humidity in percent.

Trait Implementations

impl Clone for Measurement

fn clone(&self) -> Measurement

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Measurement

impl Debug for Measurement

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Measurement

impl PartialEq for Measurement

fn eq(&self, other: &Measurement) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Measurement