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71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
// Implementation based on:
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// - ESPEasy: https://github.com/letscontrolit/ESPEasy/blob/mega/src/_P034_DHT12.ino
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// - DHT12_sensor_library: https://github.com/xreef/DHT12_sensor_library/blob/master/DHT12.cpp
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#include "dht12.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace dht12 {
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static const char *const TAG = "dht12";
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void DHT12Component::update() {
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uint8_t data[5];
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if (!this->read_data_(data)) {
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this->status_set_warning();
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return;
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}
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const uint16_t raw_temperature = uint16_t(data[2]) * 10 + (data[3] & 0x7F);
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float temperature = raw_temperature / 10.0f;
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if ((data[3] & 0x80) != 0) {
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// negative
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temperature *= -1;
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}
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const uint16_t raw_humidity = uint16_t(data[0]) * 10 + data[1];
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float humidity = raw_humidity / 10.0f;
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ESP_LOGD(TAG, "Got temperature=%.2f°C humidity=%.2f%%", temperature, humidity);
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if (this->temperature_sensor_ != nullptr)
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this->temperature_sensor_->publish_state(temperature);
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if (this->humidity_sensor_ != nullptr)
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this->humidity_sensor_->publish_state(humidity);
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this->status_clear_warning();
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}
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void DHT12Component::setup() {
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ESP_LOGCONFIG(TAG, "Setting up DHT12...");
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uint8_t data[5];
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if (!this->read_data_(data)) {
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this->mark_failed();
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return;
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}
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}
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void DHT12Component::dump_config() {
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ESP_LOGD(TAG, "DHT12:");
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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 DHT12 failed!");
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}
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LOG_SENSOR(" ", "Temperature", this->temperature_sensor_);
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LOG_SENSOR(" ", "Humidity", this->humidity_sensor_);
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}
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float DHT12Component::get_setup_priority() const { return setup_priority::DATA; }
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bool DHT12Component::read_data_(uint8_t *data) {
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if (!this->read_bytes(0, data, 5)) {
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ESP_LOGW(TAG, "Updating DHT12 failed!");
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return false;
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}
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uint8_t checksum = data[0] + data[1] + data[2] + data[3];
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if (data[4] != checksum) {
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ESP_LOGW(TAG, "DHT12 Checksum invalid!");
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return false;
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}
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return true;
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}
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} // namespace dht12
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} // namespace esphome
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