add support for EZO sensor circuits (#1239)

Co-authored-by: Samuel Sieb <samuel@sieb.net>
2026-06-01 02:28:28 +02:00 · 2020-11-17 01:01:42 -08:00
parent 7e40d4246c
commit d20caa9d60
6 changed files with 143 additions and 0 deletions
@@ -0,0 +1,86 @@
+#include "ezo.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace ezo {
+
+static const char *TAG = "ezo.sensor";
+
+static const uint16_t EZO_STATE_WAIT = 1;
+static const uint16_t EZO_STATE_SEND_TEMP = 2;
+static const uint16_t EZO_STATE_WAIT_TEMP = 4;
+
+void EZOSensor::dump_config() {
+  LOG_SENSOR("", "EZO", this);
+  LOG_I2C_DEVICE(this);
+  if (this->is_failed())
+    ESP_LOGE(TAG, "Communication with EZO circuit failed!");
+  LOG_UPDATE_INTERVAL(this);
+}
+
+void EZOSensor::update() {
+  if (this->state_ & EZO_STATE_WAIT) {
+    ESP_LOGE(TAG, "update overrun, still waiting for previous response");
+    return;
+  }
+  uint8_t c = 'R';
+  this->write_bytes_raw(&c, 1);
+  this->state_ |= EZO_STATE_WAIT;
+  this->start_time_ = millis();
+  this->wait_time_ = 900;
+}
+
+void EZOSensor::loop() {
+  uint8_t buf[20];
+  if (!(this->state_ & EZO_STATE_WAIT)) {
+    if (this->state_ & EZO_STATE_SEND_TEMP) {
+      int len = sprintf((char *) buf, "T,%0.3f", this->tempcomp_);
+      this->write_bytes_raw(buf, len);
+      this->state_ = EZO_STATE_WAIT | EZO_STATE_WAIT_TEMP;
+      this->start_time_ = millis();
+      this->wait_time_ = 300;
+    }
+    return;
+  }
+  if (millis() - this->start_time_ < this->wait_time_)
+    return;
+  buf[0] = 0;
+  if (!this->read_bytes_raw(buf, 20)) {
+    ESP_LOGE(TAG, "read error");
+    this->state_ = 0;
+    return;
+  }
+  switch (buf[0]) {
+    case 1:
+      break;
+    case 2:
+      ESP_LOGE(TAG, "device returned a syntax error");
+      break;
+    case 254:
+      return;  // keep waiting
+    case 255:
+      ESP_LOGE(TAG, "device returned no data");
+      break;
+    default:
+      ESP_LOGE(TAG, "device returned an unknown response: %d", buf[0]);
+      break;
+  }
+  if (this->state_ & EZO_STATE_WAIT_TEMP) {
+    this->state_ = 0;
+    return;
+  }
+  this->state_ &= ~EZO_STATE_WAIT;
+  if (buf[0] != 1)
+    return;
+
+  float val = strtof((char *) &buf[1], nullptr);
+  this->publish_state(val);
+}
+
+void EZOSensor::set_tempcomp_value(float temp) {
+  this->tempcomp_ = temp;
+  this->state_ |= EZO_STATE_SEND_TEMP;
+}
+
+}  // namespace ezo
+}  // namespace esphome