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<section id="opt4060-driver">
<h1>OPT4060 driver<a class="headerlink" href="#opt4060-driver" title="Link to this heading">¶</a></h1>
<section id="overview">
<h2>1. Overview<a class="headerlink" href="#overview" title="Link to this heading">¶</a></h2>
<p>This driver supports the Texas Instrument RGBW high resolution color sensor over
I2C.
<a class="reference external" href="https://www.ti.com/lit/gpn/opt4060">https://www.ti.com/lit/gpn/opt4060</a></p>
<p>The driver supports:
- Raw values for red, green, blue and clear.
- Illuminance values.
- Scaled color values for red, green and blue.
- IIO events for thresholds.
- IIO triggered buffer using both its own data ready trigger and triggers from
other drivers.</p>
</section>
<section id="illuminance-calculation">
<h2>2. Illuminance calculation<a class="headerlink" href="#illuminance-calculation" title="Link to this heading">¶</a></h2>
<p>Illuminance is calculated using the wide spectrum green channel.</p>
<p>lux = GREEN_RAW x 2.15e-3</p>
<p>The value is accessed from:
/sys/bus/iio/devices/iio:deviceX/in_illuminance_input</p>
<p>See section 8.4.5.2 in the data sheet for additional details.</p>
</section>
<section id="color-scale-values">
<h2>3. Color scale values<a class="headerlink" href="#color-scale-values" title="Link to this heading">¶</a></h2>
<p>The sensor has different sensitivity for the different color components and
compensating factors are exposed from the driver.</p>
<p>The values are accessed from:
/sys/bus/iio/devices/iio:deviceX/in_intensity_red_scale
/sys/bus/iio/devices/iio:deviceX/in_intensity_green_scale
/sys/bus/iio/devices/iio:deviceX/in_intensity_blue_scale</p>
<p>A userspace application can multiply the raw values with the scale values so
that for a particular test light source, typically white, the measurement
intensity is the same across the different color channels. This is calculated
in the following way:</p>
<p>R = RED_RAW x SCALE_RED(2.4)
G = GREEN_RAW x SCALE_GREEN(1.0)
B = BLUE_RAW x SCALE_BLUE(1.3)</p>
<p>The data sheet suggests using the scaled values to normalize the scaled R, G
and B values. This is useful to get a value for the ratio between colors
independent of light intensity. A userspace application can do this in the
following way:</p>
<p>R_NORMALIZED = R / (R + G + B)
G_NORMALIZED = G / (R + G + B)
B_NORMALIZED = B / (R + G + B)</p>
<p>See section 8.4.5.2 in the data sheet for additional details.</p>
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