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tcs34725: Remove IR compensation and improve illuminance and color temperature handling in extreme conditions (#7492)
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01e03b76a7
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1 changed files with 43 additions and 39 deletions
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@ -73,20 +73,21 @@ float TCS34725Component::get_setup_priority() const { return setup_priority::DAT
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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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float sat; /* Digital saturation level */
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this->illuminance_ = 0; // Assign 0 value before calculation
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this->color_temperature_ = 0;
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this->illuminance_ = NAN;
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this->color_temperature_ = NAN;
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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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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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static const float MAX_ILLUMINANCE = 100000.0f; // Cap illuminance at 100,000 lux
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static const float MAX_COLOR_TEMPERATURE = 15000.0f; // Maximum expected color temperature in Kelvin
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static const float MIN_COLOR_TEMPERATURE = 1000.0f; // Maximum reasonable color temperature in Kelvin
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if (c == 0) {
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return;
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@ -137,45 +138,48 @@ void TCS34725Component::calculate_temperature_and_lux_(uint16_t r, uint16_t g, u
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if (c >= sat) {
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if (this->integration_time_auto_) {
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ESP_LOGI(TAG, "Saturation too high, sample discarded, autogain ongoing");
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return;
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} else {
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ESP_LOGW(
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TAG,
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"Saturation too high, sample with saturation %.1f and clear %d treat values carefully or use grey filter",
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sat, c);
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}
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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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// discarding super low values? not recemmonded, and avoided by using auto gain.
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if (r2 == 0) {
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// legacy code
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if (!this->integration_time_auto_) {
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ESP_LOGW(TAG,
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"No light detected on red channel, switch to auto gain or adjust timing, values will be unreliable");
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"Saturation too high, sample with saturation %.1f and clear %d lux/color temperature cannot reliably "
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"calculated, reduce integration/gain or use a grey filter.",
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sat, c);
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return;
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}
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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 g1 = R_COEF * (float) r + G_COEF * (float) g + B_COEF * (float) b;
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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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this->illuminance_ = std::max(g1 / cpl, 0.0f);
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if (this->illuminance_ > MAX_ILLUMINANCE) {
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ESP_LOGW(TAG, "Calculated illuminance greater than limit (%f), setting to NAN", this->illuminance_);
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this->illuminance_ = NAN;
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return;
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}
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if (r == 0) {
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ESP_LOGW(TAG, "Red channel is zero, cannot compute color temperature");
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return;
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}
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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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/* to red light. */
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this->color_temperature_ = (CT_COEF * (float) b) / (float) r + CT_OFFSET;
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// Ensure the color temperature stays within reasonable bounds
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if (this->color_temperature_ < MIN_COLOR_TEMPERATURE) {
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ESP_LOGW(TAG, "Calculated color temperature value too low (%f), setting to NAN", this->color_temperature_);
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this->color_temperature_ = NAN;
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} else if (this->color_temperature_ > MAX_COLOR_TEMPERATURE) {
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ESP_LOGW(TAG, "Calculated color temperature value too high (%f), setting to NAN", this->color_temperature_);
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this->color_temperature_ = NAN;
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}
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}
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void TCS34725Component::update() {
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