sascha/esphome
1
0
Fork 0
mirror of https://github.com/esphome/esphome.git synced 2025-10-02 18:12:20 +01:00
Code Issues Releases Wiki Activity

extend scd4x (#3409)

Browse Source 
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
This commit is contained in:
Martin
2022-05-10 11:25:44 +02:00
committed by GitHub
parent 4e1f6518e8
commit 782186e13d
6 changed files with 287 additions and 76 deletions
Download Patch File Download Diff File Expand all files Collapse all files

233
esphome/components/scd4x/scd4x.cpp
View File

@@ -13,39 +13,32 @@ static const uint16_t SCD4X_CMD_ALTITUDE_COMPENSATION = 0x2427;
static const uint16_t SCD4X_CMD_AMBIENT_PRESSURE_COMPENSATION = 0xe000;
static const uint16_t SCD4X_CMD_AUTOMATIC_SELF_CALIBRATION = 0x2416;
static const uint16_t SCD4X_CMD_START_CONTINUOUS_MEASUREMENTS = 0x21b1;
static const uint16_t SCD4X_CMD_START_LOW_POWER_CONTINUOUS_MEASUREMENTS = 0x21ac;
static const uint16_t SCD4X_CMD_START_LOW_POWER_SINGLE_SHOT = 0x219d; // SCD41 only
static const uint16_t SCD4X_CMD_START_LOW_POWER_SINGLE_SHOT_RHT_ONLY = 0x2196;
static const uint16_t SCD4X_CMD_GET_DATA_READY_STATUS = 0xe4b8;
static const uint16_t SCD4X_CMD_READ_MEASUREMENT = 0xec05;
static const uint16_t SCD4X_CMD_PERFORM_FORCED_CALIBRATION = 0x362f;
static const uint16_t SCD4X_CMD_STOP_MEASUREMENTS = 0x3f86;
static const uint16_t SCD4X_CMD_FACTORY_RESET = 0x3632;
static const uint16_t SCD4X_CMD_GET_FEATURESET = 0x202f;
static const float SCD4X_TEMPERATURE_OFFSET_MULTIPLIER = (1 << 16) / 175.0f;
static const uint16_t SCD41_ID = 0x1408;
static const uint16_t SCD40_ID = 0x440;
void SCD4XComponent::setup() {
ESP_LOGCONFIG(TAG, "Setting up scd4x...");
// the sensor needs 1000 ms to enter the idle state
this->set_timeout(1000, [this]() {
uint16_t raw_read_status;
if (!this->get_register(SCD4X_CMD_GET_DATA_READY_STATUS, raw_read_status)) {
ESP_LOGE(TAG, "Failed to read data ready status");
this->status_clear_error();
if (!this->write_command(SCD4X_CMD_STOP_MEASUREMENTS)) {
ESP_LOGE(TAG, "Failed to stop measurements");
this->mark_failed();
return;
}
uint32_t stop_measurement_delay = 0;
// In order to query the device periodic measurement must be ceased
if (raw_read_status) {
ESP_LOGD(TAG, "Sensor has data available, stopping periodic measurement");
if (!this->write_command(SCD4X_CMD_STOP_MEASUREMENTS)) {
ESP_LOGE(TAG, "Failed to stop measurements");
this->mark_failed();
return;
}
// According to the SCD4x datasheet the sensor will only respond to other commands after waiting 500 ms after
// issuing the stop_periodic_measurement command
stop_measurement_delay = 500;
}
this->set_timeout(stop_measurement_delay, [this]() {
// According to the SCD4x datasheet the sensor will only respond to other commands after waiting 500 ms after
// issuing the stop_periodic_measurement command
this->set_timeout(500, [this]() {
uint16_t raw_serial_number[3];
if (!this->get_register(SCD4X_CMD_GET_SERIAL_NUMBER, raw_serial_number, 3, 1)) {
ESP_LOGE(TAG, "Failed to read serial number");
@@ -89,15 +82,9 @@ void SCD4XComponent::setup() {
return;
}
// Finally start sensor measurements
if (!this->write_command(SCD4X_CMD_START_CONTINUOUS_MEASUREMENTS)) {
ESP_LOGE(TAG, "Error starting continuous measurements.");
this->error_code_ = MEASUREMENT_INIT_FAILED;
this->mark_failed();
return;
}
initialized_ = true;
// Finally start sensor measurements
this->start_measurement_();
ESP_LOGD(TAG, "Sensor initialized");
});
});
@@ -123,12 +110,31 @@ void SCD4XComponent::dump_config() {
}
}
ESP_LOGCONFIG(TAG, " Automatic self calibration: %s", ONOFF(this->enable_asc_));
if (this->ambient_pressure_compensation_) {
ESP_LOGCONFIG(TAG, " Altitude compensation disabled");
ESP_LOGCONFIG(TAG, " Ambient pressure compensation: %dmBar", this->ambient_pressure_);
if (this->ambient_pressure_source_ != nullptr) {
ESP_LOGCONFIG(TAG, " Dynamic ambient pressure compensation using sensor '%s'",
this->ambient_pressure_source_->get_name().c_str());
} else {
ESP_LOGCONFIG(TAG, " Ambient pressure compensation disabled");
ESP_LOGCONFIG(TAG, " Altitude compensation: %dm", this->altitude_compensation_);
if (this->ambient_pressure_compensation_) {
ESP_LOGCONFIG(TAG, " Altitude compensation disabled");
ESP_LOGCONFIG(TAG, " Ambient pressure compensation: %dmBar", this->ambient_pressure_);
} else {
ESP_LOGCONFIG(TAG, " Ambient pressure compensation disabled");
ESP_LOGCONFIG(TAG, " Altitude compensation: %dm", this->altitude_compensation_);
}
}
switch (this->measurement_mode_) {
case PERIODIC:
ESP_LOGCONFIG(TAG, " Measurement mode: periodic (5s)");
break;
case LOW_POWER_PERIODIC:
ESP_LOGCONFIG(TAG, " Measurement mode: low power periodic (30s)");
break;
case SINGLE_SHOT:
ESP_LOGCONFIG(TAG, " Measurement mode: single shot");
break;
case SINGLE_SHOT_RHT_ONLY:
ESP_LOGCONFIG(TAG, " Measurement mode: single shot rht only");
break;
}
ESP_LOGCONFIG(TAG, " Temperature offset: %.2f °C", this->temperature_offset_);
LOG_UPDATE_INTERVAL(this);
@@ -149,47 +155,105 @@ void SCD4XComponent::update() {
}
}
// Check if data is ready
if (!this->write_command(SCD4X_CMD_GET_DATA_READY_STATUS)) {
this->status_set_warning();
return;
uint32_t wait_time = 0;
if (this->measurement_mode_ == SINGLE_SHOT || this->measurement_mode_ == SINGLE_SHOT_RHT_ONLY) {
start_measurement_();
wait_time =
this->measurement_mode_ == SINGLE_SHOT ? 5000 : 50; // Single shot measurement takes 5 secs rht mode 50 ms
}
this->set_timeout(wait_time, [this]() {
// Check if data is ready
if (!this->write_command(SCD4X_CMD_GET_DATA_READY_STATUS)) {
this->status_set_warning();
return;
}
uint16_t raw_read_status;
if (!this->read_data(raw_read_status) || raw_read_status == 0x00) {
this->status_set_warning();
ESP_LOGW(TAG, "Data not ready yet!");
return;
}
uint16_t raw_read_status;
if (!this->write_command(SCD4X_CMD_READ_MEASUREMENT)) {
ESP_LOGW(TAG, "Error reading measurement!");
this->status_set_warning();
return;
}
if (!this->read_data(raw_read_status) || raw_read_status == 0x00) {
this->status_set_warning();
ESP_LOGW(TAG, "Data not ready yet!");
return;
}
// Read off sensor data
uint16_t raw_data[3];
if (!this->read_data(raw_data, 3)) {
this->status_set_warning();
return;
}
if (!this->write_command(SCD4X_CMD_READ_MEASUREMENT)) {
ESP_LOGW(TAG, "Error reading measurement!");
this->status_set_warning();
return; // NO RETRY
}
// Read off sensor data
uint16_t raw_data[3];
if (!this->read_data(raw_data, 3)) {
this->status_set_warning();
return;
}
if (this->co2_sensor_ != nullptr)
this->co2_sensor_->publish_state(raw_data[0]);
if (this->co2_sensor_ != nullptr)
this->co2_sensor_->publish_state(raw_data[0]);
if (this->temperature_sensor_ != nullptr) {
const float temperature = -45.0f + (175.0f * (raw_data[1])) / (1 << 16);
this->temperature_sensor_->publish_state(temperature);
}
if (this->humidity_sensor_ != nullptr) {
const float humidity = (100.0f * raw_data[2]) / (1 << 16);
this->humidity_sensor_->publish_state(humidity);
}
this->status_clear_warning();
if (this->temperature_sensor_ != nullptr) {
const float temperature = -45.0f + (175.0f * (raw_data[1])) / (1 << 16);
this->temperature_sensor_->publish_state(temperature);
}
if (this->humidity_sensor_ != nullptr) {
const float humidity = (100.0f * raw_data[2]) / (1 << 16);
this->humidity_sensor_->publish_state(humidity);
}
this->status_clear_warning();
}); // set_timeout
}
bool SCD4XComponent::perform_forced_calibration(uint16_t current_co2_concentration) {
/*
Operate the SCD4x in the operation mode later used in normal sensor operation (periodic measurement, low power
periodic measurement or single shot) for > 3 minutes in an environment with homogenous and constant CO2
concentration before performing a forced recalibration.
*/
if (!this->write_command(SCD4X_CMD_STOP_MEASUREMENTS)) {
ESP_LOGE(TAG, "Failed to stop measurements");
this->status_set_warning();
}
this->set_timeout(500, [this, current_co2_concentration]() {
if (this->write_command(SCD4X_CMD_PERFORM_FORCED_CALIBRATION, current_co2_concentration)) {
ESP_LOGD(TAG, "setting forced calibration Co2 level %d ppm", current_co2_concentration);
// frc takes 400 ms
// because this method will be used very rarly
// the simple aproach with delay is ok
delay(400); // NOLINT'
if (!this->start_measurement_()) {
return false;
} else {
ESP_LOGD(TAG, "forced calibration complete");
}
return true;
} else {
ESP_LOGE(TAG, "force calibration failed");
this->error_code_ = FRC_FAILED;
this->status_set_warning();
return false;
}
});
return true;
}
bool SCD4XComponent::factory_reset() {
if (!this->write_command(SCD4X_CMD_STOP_MEASUREMENTS)) {
ESP_LOGE(TAG, "Failed to stop measurements");
this->status_set_warning();
return false;
}
this->set_timeout(500, [this]() {
if (!this->write_command(SCD4X_CMD_FACTORY_RESET)) {
ESP_LOGE(TAG, "Failed to send factory reset command");
this->status_set_warning();
return false;
}
ESP_LOGD(TAG, "Factory reset complete");
return true;
});
return true;
}
// Note pressure in bar here. Convert to hPa
void SCD4XComponent::set_ambient_pressure_compensation(float pressure_in_bar) {
ambient_pressure_compensation_ = true;
@@ -213,5 +277,38 @@ bool SCD4XComponent::update_ambient_pressure_compensation_(uint16_t pressure_in_
}
}
bool SCD4XComponent::start_measurement_() {
uint16_t measurement_command = SCD4X_CMD_START_CONTINUOUS_MEASUREMENTS;
switch (this->measurement_mode_) {
case PERIODIC:
measurement_command = SCD4X_CMD_START_CONTINUOUS_MEASUREMENTS;
break;
case LOW_POWER_PERIODIC:
measurement_command = SCD4X_CMD_START_LOW_POWER_CONTINUOUS_MEASUREMENTS;
break;
case SINGLE_SHOT:
measurement_command = SCD4X_CMD_START_LOW_POWER_SINGLE_SHOT;
break;
case SINGLE_SHOT_RHT_ONLY:
measurement_command = SCD4X_CMD_START_LOW_POWER_SINGLE_SHOT_RHT_ONLY;
break;
}
static uint8_t remaining_retries = 3;
while (remaining_retries) {
if (!this->write_command(measurement_command)) {
ESP_LOGE(TAG, "Error starting measurements.");
this->error_code_ = MEASUREMENT_INIT_FAILED;
this->status_set_warning();
if (--remaining_retries == 0)
return false;
delay(50); // NOLINT wait 50 ms and try again
}
this->status_clear_warning();
return true;
}
return false;
}
} // namespace scd4x
} // namespace esphome