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Add NTC and resistance sensor (#560)

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* Add NTC and resistance sensor

Fixes https://github.com/esphome/feature-requests/issues/248

* Fix

* Fix platformio4 moved get_project_dir
This commit is contained in:
Otto Winter
2019-05-28 16:00:00 +02:00
committed by GitHub
parent 9fa1a334e6
commit 61ba2e0f35
12 changed files with 321 additions and 2 deletions
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esphome/components/resistance/resistance_sensor.cpp
+42
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#include "resistance_sensor.h"
#include "esphome/core/log.h"
namespace esphome {
namespace resistance {
static const char *TAG = "resistance";
void ResistanceSensor::dump_config() {
LOG_SENSOR("", "Resistance Sensor", this);
ESP_LOGCONFIG(TAG, " Configuration: %s", this->configuration_ == UPSTREAM ? "UPSTREAM" : "DOWNSTREAM");
ESP_LOGCONFIG(TAG, " Resistor: %.2fΩ", this->resistor_);
ESP_LOGCONFIG(TAG, " Reference Voltage: %.1fV", this->reference_voltage_);
}
void ResistanceSensor::process_(float value) {
if (isnan(value)) {
this->publish_state(NAN);
return;
}
float res = 0;
switch (this->configuration_) {
case UPSTREAM:
if (value == 0.0f)
res = NAN;
else
res = (this->reference_voltage_ - value) / value;
break;
case DOWNSTREAM:
if (value == this->reference_voltage_)
res = NAN;
else
res = value / (this->reference_voltage_ - value);
break;
}
res *= this->resistor_;
ESP_LOGD(TAG, "'%s' - Resistance %.1fΩ", this->name_.c_str(), res);
this->publish_state(res);
}
} // namespace resistance
} // namespace esphome