ntc.cpp

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#include "ntc.h"
#include "esphome/core/log.h"
 
namespace esphome::ntc {
 
ESPHOME_LOG_TAG(TAG, "ntc");
 
void NTC::setup() {
  this->sensor_->add_on_state_callback([this](float value) { this->process_(value); });
  if (this->sensor_->has_state())
    this->process_(this->sensor_->state);
}
void NTC::dump_config() { LOG_SENSOR("", "NTC Sensor", this); }
void NTC::process_(float value) {
  if (std::isnan(value)) {
    this->publish_state(NAN);
    return;
  }
 
  double lr = log(double(value));
  double v = this->a_ + this->b_ * lr + this->c_ * lr * lr * lr;
  auto temp = float(1.0 / v - 273.15);
 
  ESP_LOGV(TAG, "'%s' - Temperature: %.1f°C", LOG_STR_ARG(this->get_log_name()), temp);
  this->publish_state(temp);
}
 
}  // namespace esphome::ntc