GCBASIC / Discussion / Contributors: AS7262 Visible Light 6-channel spectral (visible) sensor

A new library that uses the new float capability, but, you can use this sensor with out having to use floats.

The library supports:

AS7262 Visible Light 6-channel spectral (visible) sensor
AS7263 Near Infrared Spectral Sensor

These sensors detects six distinct channels of visible light with this spectral sensor.
Unlike normal RGB colour sensors, with the AS7262 provides six bands of colour readings that roughly translate to red, orange, yellow, green, blue, and violet. The rainbow.

The two onboard white LEDs provides illumination to give more accurate spectral readings and also measure the reflectivity of surfaces.

The LEDs are typically high-quality ones with a CRI of >=90 and a colour temperature of 4,000K for consistent and accurate colour rendering.

With this sensor, like analysing different light sources, measuring the transmission of light through materials or solutions (with an additional light source).

The AS7262 6-Channel Spectral Sensor Breakout is an I2C interface and is 3.3V or 5V compatible.

Demonstration program is here: https://github.com/GreatCowBASIC/Demonstration_Sources/blob/main/Spectral_Sensor_Solutions/Spectral_Sensor_AS726X/AS7262_Spectral_Sensor.gcb

See this video

Enjoy

Documentation

I2C interface (address: 0x49)
6 spectral channels (450, 500, 550, 570, 600, 650nm)
2 onboard illumination LEDs
3.3V or 5V compatible
Reverse polarity protection

*************************************************************************

! Utility methods
Sub AS726X_Init( ( optional AS726XGain as Byte = 3, optional AS726XMeasurementMode as Byte = 3 )     )
    Sets up the sensor for constant read
    Returns the sensor version (AS7262 or AS7263)
    Returns the sensor error number

    Set to 12.5mA (minimum)
    Turn off to avoid heating the sensor
    Set to 8mA (maximum)
    Turn off lights to save power
    setIntegrationTime 50 * 2.8ms = 140ms. 0 to 255 is valid.
    If you use Mode 2 or 3 (all the colors) then integration time is double. 140*2 = 280ms between readings.
    Set gain to 64x
    One-shot reading of VBGYOR

Sub AS726X_SetGain( in AS726XSetGain = 0b00..0b11 )
    Sets the measurement mode
    Mode 0: Continuous reading of VBGY (7262) / STUV (7263)
    Mode 1: Continuous reading of GYOR (7262) / RTUX (7263)
    Mode 2: Continuous reading of all channels (power-on default)
    Mode 3: One-shot reading of all channels

Sub AS726X_TakeMeasurements()
    Tells IC to take measurements and polls for data ready flag
    Clear DATA_RDY flag when using Mode 3
    Set mode 3 for one shot measurement of all channels
    Wait for data to be ready
    Readings can now be accessed via getViolet(), getBlue(), etc

Function AS726X_getVersion()
    Return version value

Sub AS726X_TakeMeasurementsWithBulb()
    Turns on bulb, takes measurements, turns off bulb

Function AS726X_GetTemperature()
    Returns the temperature in C
    Pretty inaccurate: +/-8.5C

Sub AS726X_SetMeasurementMode( in AS726XMeasurementMode = 0b00..0b11 )
    Sets the measurement mode
    Mode 0: Continuous reading of VBGY (7262) / STUV (7263)
    Mode 1: Continuous reading of GYOR (7262) / RTUX (7263)
    Mode 2: Continuous reading of all channels (power-on default)
    Mode 3: One-shot reading of all channels

Function AS726X_DataAvailable()
    Checks to see if DRDY flag is set in the control setup register

Sub AS726X_ClearDataAvailable()
    Clears the DRDY flag
    Normally this should clear when data registers are read

Sub AS726X_EnableIndicator()
    Enable the onboard indicator LED

Sub AS726X_DisableIndicator()
    Disable the onboard indicator LED

Sub AS726X_SetIndicatorCurrent( in AS726xCurrent = 0b00..0b11 )
    Set the current limit of onboard LED. Default is max 8mA = 0b11.

Sub AS726X_EnableBulb()
    Enable the onboard 5700k or external incandescent bulb

Sub AS726X_DisableBulb()
    Disable the onboard 5700k or external incandescent bulb

Sub AS726X_SetBulbCurrent( in AS726xCurrent = 0b00..0b11 )
    Set the current limit of bulb/LED.
    Current 0: 12.5mA
    Current 1: 25mA
    Current 2: 50mA
    Current 3: 100mA

Sub AS726X_SoftReset()
    Does a soft reset
    Delays sensor operations for 1000ms to reset

Sub AS726X_SetIntegrationTime( in AS726XValue as Byte)
    Sets the integration value
    Give this function a from 0 to 255.
    Time will be 2.8ms * [AS726XValue]

Sub AS726X_enableInterrupt()
Sub AS726X_disableInterrupt()

!Get the various color readings - the 16-bit value stored in a given channel register

Function AS7262_getViolet()
Function AS7262_getBlue()
Function AS7262_getGreen()
Function AS7262_getYellow()
Function AS7262_getOrange()
Function AS7262_getRed()

!Get the various NIR readings - the 16-bit value stored in a given channel register
Function AS7263_getR()
Function AS7263_getS()
Function AS7263_getT()
Function AS7263_getU()
Function AS7263_getV()
Function AS7263_getW()

!AS7263 specific - returns the various calibration data as float
Function AS7262_getCalibratedViolet()
Function AS7262_ggetCalibratedBlue()
Function AS7262_ggetCalibratedGreen()
Function AS7262_ggetCalibratedYellow()
Function AS7262_ggetCalibratedOrange()
Function AS7262_ggetCalibratedRed()

! AS7263 specific - returns the various calibration data as float
Function AS7263_getCalibratedR()
Function AS7263_getCalibratedS()
Function AS7263_getCalibratedT()
Function AS7263_getCalibratedU()
Function AS7263_getCalibratedV()
Function AS7263_getCalibratedW()

!Private methods
Function AS726X_GetCalibrated ( AS726XCalAddress as Byte ) as Single
    Given an address, read four uint8_ts and return the floating point calibrated value

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AS7262 Visible Light 6-channel spectral (visible) sensor

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AS7262 Visible Light 6-channel spectral (visible) sensor

AS7262 Visible Light 6-channel spectral (visible) sensor

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AS7262 Visible Light 6-channel spectral (visible) sensor