Struct Gy21 

pub struct Gy21<I2C, DL> { /* private fields */ }

Represents the GY-21 sensor

Implementations

impl<I2C: Write + Read, DL> Gy21<I2C, DL>

where DL: DelayMs<u8>,

pub const fn new(i2c: I2C, delay: DL) -> Self

Create a new GY-21 sensor from an I2C bus and a delay object with the default I2C address (0x40)

The I2C object must be created with a frequency <= 400kHz, which is the maximum the sensor is able to keep up with as stated by the datasheet.

let gy_21 = Gy21::new(i2c, delay);

pub const fn with_address(i2c: I2C, delay: DL, address: u8) -> Self

Create a new GY-21 sensor from an I2C bus, a delay object and an I2C address

let gy_21 = Gy21::with_address(i2c, delay, 0x40);

pub fn temperature(&mut self) -> Result<f32, CommError<I2C>>

Read the temperature

let reading = match gy_21.temperature() {
    Ok(val) => val;
    Err(_) => panic()!
}

Errors

Will return an error in the following cases:

• Write(i2c_err) if writing to the I2C bus fails
• Read(i2c_err) if reading the I2C bus fails

pub fn humidity(&mut self) -> Result<f32, CommError<I2C>>

Read the relative humidity

let reading = match gy_21.humidity() {
    Ok(val) => val;
    Err(_) => panic()!
}

Errors

Will return an error in the following cases:

• Write(i2c_err) if writing to the I2C bus fails
• Read(i2c_err) if reading the I2C bus fails

pub fn dew_point_temp(&mut self) -> Result<f32, CommError<I2C>>

Calculate the dew point temperature based on temperature and relative humidity readings

The dew point of a given body of air is the temperature to which it must be cooled to become saturated with water vapor.

let reading = match gy_21.dew_point_temp() {
    Ok(val) => val;
    Err(_) => panic()!
}

Errors

Will return an error in the following cases:

• Write(i2c_err) if writing to the I2C bus fails
• Read(i2c_err) if reading the I2C bus fails