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90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
#include "sht4x.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace sht4x {
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static const char *const TAG = "sht4x";
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static const uint8_t MEASURECOMMANDS[] = {0xFD, 0xF6, 0xE0};
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void SHT4XComponent::start_heater_() {
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uint8_t cmd[] = {MEASURECOMMANDS[this->heater_command_]};
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ESP_LOGD(TAG, "Heater turning on");
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this->write_bytes_raw(cmd, 1);
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}
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void SHT4XComponent::setup() {
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ESP_LOGCONFIG(TAG, "Setting up sht4x...");
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if (this->duty_cycle_ > 0.0) {
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uint32_t heater_interval = (uint32_t)(this->heater_time_ / this->duty_cycle_);
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ESP_LOGD(TAG, "Heater interval: %i", heater_interval);
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if (this->heater_power_ == SHT4X_HEATERPOWER_HIGH) {
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if (this->heater_time_ == SHT4X_HEATERTIME_LONG) {
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this->heater_command_ = 0x39;
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} else {
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this->heater_command_ = 0x32;
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}
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} else if (this->heater_power_ == SHT4X_HEATERPOWER_MED) {
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if (this->heater_time_ == SHT4X_HEATERTIME_LONG) {
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this->heater_command_ = 0x2F;
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} else {
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this->heater_command_ = 0x24;
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}
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} else {
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if (this->heater_time_ == SHT4X_HEATERTIME_LONG) {
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this->heater_command_ = 0x1E;
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} else {
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this->heater_command_ = 0x15;
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}
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}
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ESP_LOGD(TAG, "Heater command: %x", this->heater_command_);
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this->set_interval(heater_interval, std::bind(&SHT4XComponent::start_heater_, this));
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}
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}
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void SHT4XComponent::dump_config() { LOG_I2C_DEVICE(this); }
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void SHT4XComponent::update() {
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uint8_t cmd[] = {MEASURECOMMANDS[this->precision_]};
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// Send command
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this->write_bytes_raw(cmd, 1);
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this->set_timeout(10, [this]() {
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const uint8_t num_bytes = 6;
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uint8_t buffer[num_bytes];
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// Read measurement
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bool read_status = this->read_bytes_raw(buffer, num_bytes);
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if (read_status) {
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// Evaluate and publish measurements
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if (this->temp_sensor_ != nullptr) {
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// Temp is contained in the first 16 bits
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float sensor_value_temp = (buffer[0] << 8) + buffer[1];
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float temp = -45 + 175 * sensor_value_temp / 65535;
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this->temp_sensor_->publish_state(temp);
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}
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if (this->humidity_sensor_ != nullptr) {
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// Relative humidity is in the last 16 bits
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float sensor_value_rh = (buffer[3] << 8) + buffer[4];
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float rh = -6 + 125 * sensor_value_rh / 65535;
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this->humidity_sensor_->publish_state(rh);
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}
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} else {
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ESP_LOGD(TAG, "Sensor read failed");
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}
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});
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}
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} // namespace sht4x
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} // namespace esphome
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