Expand description
This is a platform agnostic Rust driver for the VEML6040 RGBW color light
sensor, based on the embedded-hal traits.
This driver allows you to:
- Enable/disable the sensor.
- Set the integration time.
- Set the measurement mode.
- Trigger a measurement when on manual mode.
- Read the red channel measurement.
- Read the green channel measurement.
- Read the blue channel measurement.
- Read the white channel measurement.
- Read measurement of all channels at once.
The device
VEML6040 color sensor senses red, green, blue, and white light and incorporates photodiodes, amplifiers, and analog / digital circuits into a single chip using CMOS process. With the color sensor applied, the brightness, and color temperature of backlight can be adjusted base on ambient light source that makes panel looks more comfortable for end user’s eyes. VEML6040’s adoption of Filtron TM technology achieves the closest ambient light spectral sensitivity to real human eye responses. VEML6040 provides excellent temperature compensation capability for keeping the output stable under changing temperature. VEML6040’s function are easily operated via the simple command format of I2C (SMBus compatible) interface protocol. VEML6040’s operating voltage ranges from 2.5 V to 3.6 V.
Datasheet:
Application note:
Usage examples (see also examples folder)
Enable and read the color measurement
Import this crate and an embedded_hal implementation, then instantiate
the device:
extern crate linux_embedded_hal as hal;
extern crate veml6040;
use hal::I2cdev;
use veml6040::Veml6040;
let dev = I2cdev::new("/dev/i2c-1").unwrap();
let mut sensor = Veml6040::new(dev);
sensor.enable().unwrap();
let red = sensor.read_red_channel().unwrap();
let green = sensor.read_green_channel().unwrap();
let blue = sensor.read_blue_channel().unwrap();
let white = sensor.read_white_channel().unwrap();
println!("Measurements: red = {}, green = {}, blue = {}, white = {}",
red, green, blue, white);Read all the channels at once
extern crate linux_embedded_hal as hal;
extern crate veml6040;
use hal::I2cdev;
use veml6040::Veml6040;
let dev = I2cdev::new("/dev/i2c-1").unwrap();
let mut sensor = Veml6040::new(dev);
sensor.enable().unwrap();
let measurement = sensor.read_all_channels().unwrap();
println!("Measurements: red = {}, green = {}, blue = {}, white = {}",
measurement.red, measurement.green, measurement.blue,
measurement.white);Set the integration time to 320ms
extern crate linux_embedded_hal as hal;
extern crate veml6040;
use hal::I2cdev;
use veml6040::{ Veml6040, IntegrationTime };
let dev = I2cdev::new("/dev/i2c-1").unwrap();
let mut sensor = Veml6040::new(dev);
sensor.enable().unwrap();
sensor.set_integration_time(IntegrationTime::_320ms).unwrap();Set the measurement mode to manual and trigger a measurement
extern crate linux_embedded_hal as hal;
extern crate veml6040;
use hal::I2cdev;
use veml6040::{ Veml6040, MeasurementMode };
let dev = I2cdev::new("/dev/i2c-1").unwrap();
let mut sensor = Veml6040::new(dev);
sensor.enable().unwrap();
sensor.set_measurement_mode(MeasurementMode::Manual).unwrap();
sensor.trigger_measurement().unwrap();