93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
#include "wts01.h"
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#include "esphome/core/log.h"
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#include <cmath>
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namespace esphome::wts01 {
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constexpr uint8_t HEADER_1 = 0x55;
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constexpr uint8_t HEADER_2 = 0x01;
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constexpr uint8_t HEADER_3 = 0x01;
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constexpr uint8_t HEADER_4 = 0x04;
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static const char *const TAG = "wts01";
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void WTS01Sensor::loop() {
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// Process all available data at once
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while (this->available()) {
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uint8_t c;
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if (this->read_byte(&c)) {
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this->handle_char_(c);
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}
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}
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}
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void WTS01Sensor::dump_config() { LOG_SENSOR("", "WTS01 Sensor", this); }
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void WTS01Sensor::handle_char_(uint8_t c) {
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// State machine for processing the header. Reset if something doesn't match.
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if (this->buffer_pos_ == 0 && c != HEADER_1) {
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return;
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}
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if (this->buffer_pos_ == 1 && c != HEADER_2) {
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this->buffer_pos_ = 0;
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return;
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}
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if (this->buffer_pos_ == 2 && c != HEADER_3) {
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this->buffer_pos_ = 0;
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return;
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}
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if (this->buffer_pos_ == 3 && c != HEADER_4) {
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this->buffer_pos_ = 0;
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return;
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}
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// Add byte to buffer
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this->buffer_[this->buffer_pos_++] = c;
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// Process complete packet
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if (this->buffer_pos_ >= PACKET_SIZE) {
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this->process_packet_();
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this->buffer_pos_ = 0;
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}
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}
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void WTS01Sensor::process_packet_() {
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// Based on Tasmota implementation
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// Format: 55 01 01 04 01 11 16 12 95
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// header T Td Ck - T = Temperature, Td = Temperature decimal, Ck = Checksum
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uint8_t calculated_checksum = 0;
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for (uint8_t i = 0; i < PACKET_SIZE - 1; i++) {
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calculated_checksum += this->buffer_[i];
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}
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uint8_t received_checksum = this->buffer_[PACKET_SIZE - 1];
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if (calculated_checksum != received_checksum) {
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ESP_LOGW(TAG, "WTS01 Checksum doesn't match: 0x%02X != 0x%02X", received_checksum, calculated_checksum);
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return;
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}
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// Extract temperature value
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const uint8_t raw = this->buffer_[6];
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// WTS01 encodes sign in bit 7, magnitude in bits 0-6
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const bool negative = (raw & 0x80) != 0;
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const uint8_t magnitude = raw & 0x7F;
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const float decimal = static_cast<float>(this->buffer_[7]) / 100.0f;
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float temperature = static_cast<float>(magnitude) + decimal;
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if (negative) {
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temperature = -temperature;
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}
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ESP_LOGV(TAG, "Received new temperature: %.2f°C", temperature);
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this->publish_state(temperature);
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}
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} // namespace esphome::wts01
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