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TCS34725 BugFix and GA factor (#2445)
- Fixed endianness bug on tcs34725 data read - Fixed lux adjustments based on gain, integration time and GA factor - Added glass attenuation factor to allow using this sensor behind semi transparent glass Co-authored-by: Razorback16 <razorback16@users.noreply.github.com>
This commit is contained in:
razorback16
GitHub
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commit
534ce11d54
4 changed files with 197 additions and 31 deletions
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@ -6,6 +6,7 @@ from esphome.const import (
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CONF_GAIN,
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CONF_ID,
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CONF_ILLUMINANCE,
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CONF_GLASS_ATTENUATION_FACTOR,
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CONF_INTEGRATION_TIME,
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DEVICE_CLASS_ILLUMINANCE,
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ICON_LIGHTBULB,
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@ -34,8 +35,20 @@ TCS34725_INTEGRATION_TIMES = {
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"24ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_24MS,
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"50ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_50MS,
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"101ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_101MS,
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"120ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_120MS,
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"154ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_154MS,
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"700ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_700MS,
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"180ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_180MS,
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"199ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_199MS,
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"240ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_240MS,
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"300ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_300MS,
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"360ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_360MS,
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"401ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_401MS,
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"420ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_420MS,
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"480ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_480MS,
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"499ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_499MS,
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"540ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_540MS,
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"600ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_600MS,
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"614ms": TCS34725IntegrationTime.TCS34725_INTEGRATION_TIME_614MS,
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}
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TCS34725Gain = tcs34725_ns.enum("TCS34725Gain")
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@ -79,6 +92,9 @@ CONFIG_SCHEMA = (
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TCS34725_INTEGRATION_TIMES, lower=True
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),
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cv.Optional(CONF_GAIN, default="1X"): cv.enum(TCS34725_GAINS, upper=True),
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cv.Optional(CONF_GLASS_ATTENUATION_FACTOR, default=1.0): cv.float_range(
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min=1.0
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),
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}
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)
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.extend(cv.polling_component_schema("60s"))
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@ -93,6 +109,7 @@ async def to_code(config):
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cg.add(var.set_integration_time(config[CONF_INTEGRATION_TIME]))
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cg.add(var.set_gain(config[CONF_GAIN]))
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cg.add(var.set_glass_attenuation_factor(config[CONF_GLASS_ATTENUATION_FACTOR]))
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if CONF_RED_CHANNEL in config:
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sens = await sensor.new_sensor(config[CONF_RED_CHANNEL])
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@ -26,10 +26,8 @@ void TCS34725Component::setup() {
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return;
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}
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uint8_t integration_reg = this->integration_time_;
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uint8_t gain_reg = this->gain_;
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if (!this->write_byte(TCS34725_REGISTER_ATIME, integration_reg) ||
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!this->write_byte(TCS34725_REGISTER_CONTROL, gain_reg)) {
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if (!this->write_byte(TCS34725_REGISTER_ATIME, this->integration_reg_) ||
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!this->write_byte(TCS34725_REGISTER_CONTROL, this->gain_reg_)) {
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this->mark_failed();
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return;
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}
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@ -61,6 +59,114 @@ void TCS34725Component::dump_config() {
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LOG_SENSOR(" ", "Color Temperature", this->color_temperature_sensor_);
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}
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float TCS34725Component::get_setup_priority() const { return setup_priority::DATA; }
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/*!
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* @brief Converts the raw R/G/B values to color temperature in degrees
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* Kelvin using the algorithm described in DN40 from Taos (now AMS).
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* @param r
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* Red value
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* @param g
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* Green value
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* @param b
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* Blue value
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* @param c
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* Clear channel value
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* @return Color temperature in degrees Kelvin
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*/
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void TCS34725Component::calculate_temperature_and_lux_(uint16_t r, uint16_t g, uint16_t b, uint16_t c) {
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float r2, g2, b2; /* RGB values minus IR component */
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float sat; /* Digital saturation level */
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float ir; /* Inferred IR content */
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this->illuminance_ = 0; // Assign 0 value before calculation
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this->color_temperature_ = 0;
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const float ga = this->glass_attenuation_; // Glass Attenuation Factor
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static const float DF = 310.f; // Device Factor
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static const float R_COEF = 0.136f; //
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static const float G_COEF = 1.f; // used in lux computation
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static const float B_COEF = -0.444f; //
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static const float CT_COEF = 3810.f; // Color Temperature Coefficient
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static const float CT_OFFSET = 1391.f; // Color Temperatuer Offset
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if (c == 0) {
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return;
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}
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/* Analog/Digital saturation:
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*
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* (a) As light becomes brighter, the clear channel will tend to
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* saturate first since R+G+B is approximately equal to C.
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* (b) The TCS34725 accumulates 1024 counts per 2.4ms of integration
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* time, up to a maximum values of 65535. This means analog
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* saturation can occur up to an integration time of 153.6ms
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* (64*2.4ms=153.6ms).
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* (c) If the integration time is > 153.6ms, digital saturation will
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* occur before analog saturation. Digital saturation occurs when
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* the count reaches 65535.
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*/
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if ((256 - this->integration_reg_) > 63) {
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/* Track digital saturation */
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sat = 65535.f;
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} else {
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/* Track analog saturation */
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sat = 1024.f * (256.f - this->integration_reg_);
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}
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/* Ripple rejection:
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*
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* (a) An integration time of 50ms or multiples of 50ms are required to
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* reject both 50Hz and 60Hz ripple.
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* (b) If an integration time faster than 50ms is required, you may need
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* to average a number of samples over a 50ms period to reject ripple
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* from fluorescent and incandescent light sources.
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*
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* Ripple saturation notes:
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*
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* (a) If there is ripple in the received signal, the value read from C
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* will be less than the max, but still have some effects of being
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* saturated. This means that you can be below the 'sat' value, but
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* still be saturating. At integration times >150ms this can be
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* ignored, but <= 150ms you should calculate the 75% saturation
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* level to avoid this problem.
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*/
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if (this->integration_time_ < 150) {
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/* Adjust sat to 75% to avoid analog saturation if atime < 153.6ms */
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sat -= sat / 4.f;
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}
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/* Check for saturation and mark the sample as invalid if true */
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if (c >= sat) {
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return;
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}
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/* AMS RGB sensors have no IR channel, so the IR content must be */
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/* calculated indirectly. */
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ir = ((r + g + b) > c) ? (r + g + b - c) / 2 : 0;
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/* Remove the IR component from the raw RGB values */
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r2 = r - ir;
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g2 = g - ir;
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b2 = b - ir;
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if (r2 == 0) {
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return;
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}
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// Lux Calculation (DN40 3.2)
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float g1 = R_COEF * r2 + G_COEF * g2 + B_COEF * b2;
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float cpl = (this->integration_time_ * this->gain_) / (ga * DF);
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this->illuminance_ = g1 / cpl;
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// Color Temperature Calculation (DN40)
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/* A simple method of measuring color temp is to use the ratio of blue */
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/* to red light, taking IR cancellation into account. */
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this->color_temperature_ = (CT_COEF * b2) / /** Color temp coefficient. */
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r2 +
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CT_OFFSET; /** Color temp offset. */
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}
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void TCS34725Component::update() {
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uint16_t raw_c;
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uint16_t raw_r;
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@ -74,6 +180,12 @@ void TCS34725Component::update() {
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return;
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}
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// May need to fix endianness as the data read over I2C is big-endian, but most ESP platforms are little-endian
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raw_c = i2c::i2ctohs(raw_c);
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raw_r = i2c::i2ctohs(raw_r);
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raw_g = i2c::i2ctohs(raw_g);
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raw_b = i2c::i2ctohs(raw_b);
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const float channel_c = raw_c / 655.35f;
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const float channel_r = raw_r / 655.35f;
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const float channel_g = raw_g / 655.35f;
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@ -87,38 +199,54 @@ void TCS34725Component::update() {
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if (this->blue_sensor_ != nullptr)
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this->blue_sensor_->publish_state(channel_b);
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// Formulae taken from Adafruit TCS35725 library
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float illuminance = (-0.32466f * channel_r) + (1.57837f * channel_g) + (-0.73191f * channel_b);
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if (this->illuminance_sensor_ || this->color_temperature_sensor_) {
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calculate_temperature_and_lux_(raw_r, raw_g, raw_b, raw_c);
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}
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if (this->illuminance_sensor_ != nullptr)
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this->illuminance_sensor_->publish_state(illuminance);
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this->illuminance_sensor_->publish_state(this->illuminance_);
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// Color temperature
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// 1. Convert RGB to XYZ color space
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const float x = (-0.14282f * raw_r) + (1.54924f * raw_g) + (-0.95641f * raw_b);
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const float y = (-0.32466f * raw_r) + (1.57837f * raw_g) + (-0.73191f * raw_b);
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const float z = (-0.68202f * raw_r) + (0.77073f * raw_g) + (0.56332f * raw_b);
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// 2. Calculate chromacity coordinates
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const float xc = (x) / (x + y + z);
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const float yc = (y) / (x + y + z);
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// 3. Use McCamy's formula to determine the color temperature
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const float n = (xc - 0.3320f) / (0.1858f - yc);
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// 4. final color temperature in Kelvin.
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const float color_temperature = (449.0f * powf(n, 3.0f)) + (3525.0f * powf(n, 2.0f)) + (6823.3f * n) + 5520.33f;
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if (this->color_temperature_sensor_ != nullptr)
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this->color_temperature_sensor_->publish_state(color_temperature);
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this->color_temperature_sensor_->publish_state(this->color_temperature_);
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ESP_LOGD(TAG, "Got R=%.1f%%,G=%.1f%%,B=%.1f%%,C=%.1f%% Illuminance=%.1flx Color Temperature=%.1fK", channel_r,
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channel_g, channel_b, channel_c, illuminance, color_temperature);
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channel_g, channel_b, channel_c, this->illuminance_, this->color_temperature_);
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this->status_clear_warning();
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}
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void TCS34725Component::set_integration_time(TCS34725IntegrationTime integration_time) {
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this->integration_time_ = integration_time;
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this->integration_reg_ = integration_time;
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this->integration_time_ = (256.f - integration_time) * 2.4f;
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}
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void TCS34725Component::set_gain(TCS34725Gain gain) {
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this->gain_reg_ = gain;
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switch (gain) {
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case TCS34725Gain::TCS34725_GAIN_1X:
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this->gain_ = 1.f;
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break;
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case TCS34725Gain::TCS34725_GAIN_4X:
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this->gain_ = 4.f;
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break;
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case TCS34725Gain::TCS34725_GAIN_16X:
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this->gain_ = 16.f;
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break;
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case TCS34725Gain::TCS34725_GAIN_60X:
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this->gain_ = 60.f;
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break;
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default:
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this->gain_ = 1.f;
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break;
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}
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}
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void TCS34725Component::set_glass_attenuation_factor(float ga) {
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// The Glass Attenuation (FA) factor used to compensate for lower light
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// levels at the device due to the possible presence of glass. The GA is
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// the inverse of the glass transmissivity (T), so GA = 1/T. A transmissivity
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// of 50% gives GA = 1 / 0.50 = 2. If no glass is present, use GA = 1.
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// See Application Note: DN40-Rev 1.0
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this->glass_attenuation_ = ga;
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}
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void TCS34725Component::set_gain(TCS34725Gain gain) { this->gain_ = gain; }
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} // namespace tcs34725
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} // namespace esphome
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@ -12,8 +12,20 @@ enum TCS34725IntegrationTime {
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TCS34725_INTEGRATION_TIME_24MS = 0xF6,
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TCS34725_INTEGRATION_TIME_50MS = 0xEB,
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TCS34725_INTEGRATION_TIME_101MS = 0xD5,
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TCS34725_INTEGRATION_TIME_120MS = 0xCE,
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TCS34725_INTEGRATION_TIME_154MS = 0xC0,
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TCS34725_INTEGRATION_TIME_700MS = 0x00,
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TCS34725_INTEGRATION_TIME_180MS = 0xB5,
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TCS34725_INTEGRATION_TIME_199MS = 0xAD,
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TCS34725_INTEGRATION_TIME_240MS = 0x9C,
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TCS34725_INTEGRATION_TIME_300MS = 0x83,
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TCS34725_INTEGRATION_TIME_360MS = 0x6A,
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TCS34725_INTEGRATION_TIME_401MS = 0x59,
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TCS34725_INTEGRATION_TIME_420MS = 0x51,
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TCS34725_INTEGRATION_TIME_480MS = 0x38,
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TCS34725_INTEGRATION_TIME_499MS = 0x30,
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TCS34725_INTEGRATION_TIME_540MS = 0x1F,
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TCS34725_INTEGRATION_TIME_600MS = 0x06,
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TCS34725_INTEGRATION_TIME_614MS = 0x00,
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};
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enum TCS34725Gain {
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@ -27,6 +39,7 @@ class TCS34725Component : public PollingComponent, public i2c::I2CDevice {
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public:
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void set_integration_time(TCS34725IntegrationTime integration_time);
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void set_gain(TCS34725Gain gain);
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void set_glass_attenuation_factor(float ga);
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void set_clear_sensor(sensor::Sensor *clear_sensor) { clear_sensor_ = clear_sensor; }
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void set_red_sensor(sensor::Sensor *red_sensor) { red_sensor_ = red_sensor; }
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@ -49,8 +62,16 @@ class TCS34725Component : public PollingComponent, public i2c::I2CDevice {
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sensor::Sensor *blue_sensor_{nullptr};
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sensor::Sensor *illuminance_sensor_{nullptr};
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sensor::Sensor *color_temperature_sensor_{nullptr};
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TCS34725IntegrationTime integration_time_{TCS34725_INTEGRATION_TIME_2_4MS};
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TCS34725Gain gain_{TCS34725_GAIN_1X};
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float integration_time_{2.4};
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float gain_{1.0};
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float glass_attenuation_{1.0};
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float illuminance_;
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float color_temperature_;
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private:
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void calculate_temperature_and_lux_(uint16_t r, uint16_t g, uint16_t b, uint16_t c);
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uint8_t integration_reg_{TCS34725_INTEGRATION_TIME_2_4MS};
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uint8_t gain_reg_{TCS34725_GAIN_1X};
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};
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} // namespace tcs34725
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@ -403,7 +403,7 @@ sensor:
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name: Illuminance
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color_temperature:
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name: Color Temperature
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integration_time: 700ms
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integration_time: 614ms
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gain: 60x
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- platform: custom
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lambda: |-
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