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https://github.com/esphome/esphome.git
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94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
#include "bh1750.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace bh1750 {
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static const char *const TAG = "bh1750.sensor";
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static const uint8_t BH1750_COMMAND_POWER_ON = 0b00000001;
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static const uint8_t BH1750_COMMAND_MT_REG_HI = 0b01000000; // last 3 bits
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static const uint8_t BH1750_COMMAND_MT_REG_LO = 0b01100000; // last 5 bits
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void BH1750Sensor::setup() {
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ESP_LOGCONFIG(TAG, "Setting up BH1750 '%s'...", this->name_.c_str());
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if (!this->write_bytes(BH1750_COMMAND_POWER_ON, nullptr, 0)) {
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this->mark_failed();
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return;
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}
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uint8_t mtreg_hi = (this->measurement_duration_ >> 5) & 0b111;
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uint8_t mtreg_lo = (this->measurement_duration_ >> 0) & 0b11111;
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this->write_bytes(BH1750_COMMAND_MT_REG_HI | mtreg_hi, nullptr, 0);
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this->write_bytes(BH1750_COMMAND_MT_REG_LO | mtreg_lo, nullptr, 0);
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}
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void BH1750Sensor::dump_config() {
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LOG_SENSOR("", "BH1750", this);
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LOG_I2C_DEVICE(this);
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if (this->is_failed()) {
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ESP_LOGE(TAG, "Communication with BH1750 failed!");
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}
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const char *resolution_s;
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switch (this->resolution_) {
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case BH1750_RESOLUTION_0P5_LX:
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resolution_s = "0.5";
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break;
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case BH1750_RESOLUTION_1P0_LX:
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resolution_s = "1";
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break;
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case BH1750_RESOLUTION_4P0_LX:
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resolution_s = "4";
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break;
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default:
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resolution_s = "Unknown";
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break;
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}
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ESP_LOGCONFIG(TAG, " Resolution: %s", resolution_s);
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LOG_UPDATE_INTERVAL(this);
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}
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void BH1750Sensor::update() {
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if (!this->write_bytes(this->resolution_, nullptr, 0))
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return;
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uint32_t wait = 0;
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// use max conversion times
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switch (this->resolution_) {
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case BH1750_RESOLUTION_0P5_LX:
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case BH1750_RESOLUTION_1P0_LX:
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wait = 180;
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break;
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case BH1750_RESOLUTION_4P0_LX:
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wait = 24;
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break;
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}
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this->set_timeout("illuminance", wait, [this]() { this->read_data_(); });
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}
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float BH1750Sensor::get_setup_priority() const { return setup_priority::DATA; }
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void BH1750Sensor::read_data_() {
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uint16_t raw_value;
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if (this->read(reinterpret_cast<uint8_t *>(&raw_value), 2) != i2c::ERROR_OK) {
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this->status_set_warning();
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return;
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}
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raw_value = i2c::i2ctohs(raw_value);
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float lx = float(raw_value) / 1.2f;
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lx *= 69.0f / this->measurement_duration_;
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if (this->resolution_ == BH1750_RESOLUTION_0P5_LX) {
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lx /= 2.0f;
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}
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ESP_LOGD(TAG, "'%s': Got illuminance=%.1flx", this->get_name().c_str(), lx);
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this->publish_state(lx);
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this->status_clear_warning();
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}
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void BH1750Sensor::set_resolution(BH1750Resolution resolution) { this->resolution_ = resolution; }
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} // namespace bh1750
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} // namespace esphome
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