cdm7160 co2 sensor now works

CODEOWNERS

@@ -66,6 +66,7 @@ esphome/components/cap1188/* @mreditor97
 esphome/components/captive_portal/* @OttoWinter
 esphome/components/ccs811/* @habbie
 esphome/components/cd74hc4067/* @asoehlke
+esphome/components/cdm7160/* @goatchurchprime
 esphome/components/climate/* @esphome/core
 esphome/components/climate_ir/* @glmnet
 esphome/components/color_temperature/* @jesserockz

esphome/components/cdm7160/__init__.py

@@ -0,0 +1 @@
+

esphome/components/cdm7160/cdm7160.cpp

@@ -0,0 +1,70 @@
+#include "cdm7160.h"
+
+#include "esphome/core/hal.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace cdm7160 {
+
+static const uint8_t CDM7160_DATA_CO2_LO = 0x03;
+static const uint8_t CDM7160_DATA_CO2_HI = 0x04;
+static const uint8_t CDM7160_HPA_PRESSURE = 0x09;
+static const uint8_t CDM7160_HIT_ALTITUDE = 0x0A;
+
+static const char *const TAG = "cdm7160";
+
+void CDM7160Component::setup() {
+  ESP_LOGCONFIG(TAG, "Setting up CDM7160...");
+  if (!this->write_altitude_()) {
+    ESP_LOGE(TAG, "Communication with MLX90614 failed!");
+    this->mark_failed();
+    return;
+  }
+}
+
+bool CDM7160Component::write_altitude_() {
+  if (std::isnan(this->altitude_))
+    return true;
+  uint8_t value = (uint8_t) (this->altitude_ / 10);
+  if (!this->write_bytes(CDM7160_HIT_ALTITUDE, &value, 1)) {
+    return false;
+  }
+  delay(10);
+  if (!this->write_bytes(CDM7160_HIT_ALTITUDE, &value, 1)) {
+    return false;
+  }
+  delay(10);
+  return true;
+}
+
+
+void CDM7160Component::dump_config() {
+  ESP_LOGCONFIG(TAG, "CDM7160:");
+  LOG_I2C_DEVICE(this);
+  if (this->is_failed()) {
+    ESP_LOGE(TAG, "Communication with CDM7160 failed!");
+  }
+  LOG_UPDATE_INTERVAL(this);
+  LOG_SENSOR("  ", "co2", this->co2_sensor_);
+}
+
+float CDM7160Component::get_setup_priority() const { return setup_priority::DATA; }
+
+void CDM7160Component::update() {
+  uint8_t raw_co2[2];
+  if (this->read_register(CDM7160_DATA_CO2_LO, raw_co2, 2, false) != i2c::ERROR_OK) {
+    this->status_set_warning();
+    return;
+  }
+
+  int co2 = encode_uint16(raw_co2[1], raw_co2[0]);
+
+  ESP_LOGD(TAG, "Got CO2=%dppm", co2);
+
+  if (this->co2_sensor_ != nullptr && !std::isnan(co2))
+    this->co2_sensor_->publish_state(co2);
+  this->status_clear_warning();
+}
+
+}  // namespace cdm7160
+}  // namespace esphome

esphome/components/cdm7160/cdm7160.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "esphome/components/i2c/i2c.h"
+#include "esphome/components/sensor/sensor.h"
+#include "esphome/core/component.h"
+
+namespace esphome {
+namespace cdm7160 {
+
+class CDM7160Component : public PollingComponent, public i2c::I2CDevice {
+ public:
+  void setup() override;
+  void dump_config() override;
+  void update() override;
+  float get_setup_priority() const override;
+
+  void set_co2_sensor(sensor::Sensor *co2_sensor) { co2_sensor_ = co2_sensor; }
+
+  void set_altitude(float altitude) { altitude_ = altitude; }
+
+ protected:
+  sensor::Sensor *co2_sensor_{nullptr};
+  bool write_altitude_();
+  
+  float altitude_ = 5.0f;
+};
+}  // namespace cdm7160
+}  // namespace esphome

esphome/components/cdm7160/sensor.py

@@ -0,0 +1,49 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import i2c, sensor
+from esphome.const import (
+    CONF_ID,
+    CONF_CO2,
+    DEVICE_CLASS_CARBON_DIOXIDE,
+    STATE_CLASS_MEASUREMENT,
+    UNIT_PARTS_PER_MILLION,
+    ICON_MOLECULE_CO2,
+    UNIT_CELSIUS,
+)
+
+CODEOWNERS = ["@goatchurchprime"]
+DEPENDENCIES = ["i2c"]
+
+CONF_CO2 = "co2"
+
+cdm7160_ns = cg.esphome_ns.namespace("cdm7160")
+CDM7160Component = cdm7160_ns.class_(
+    "CDM7160Component", cg.PollingComponent, i2c.I2CDevice
+)
+
+CONFIG_SCHEMA = (
+    cv.Schema(
+        {
+            cv.GenerateID(): cv.declare_id(CDM7160Component),
+            cv.Optional(CONF_CO2): sensor.sensor_schema(
+                unit_of_measurement=UNIT_PARTS_PER_MILLION,
+                icon=ICON_MOLECULE_CO2,
+                accuracy_decimals=0,
+                device_class=DEVICE_CLASS_CARBON_DIOXIDE,
+                state_class=STATE_CLASS_MEASUREMENT,
+            ),
+        }
+    )
+    .extend(cv.polling_component_schema("60s"))
+    .extend(i2c.i2c_device_schema(0x69))
+)
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    await i2c.register_i2c_device(var, config)
+
+    if CONF_CO2 in config:
+        sens = await sensor.new_sensor(config[CONF_CO2])
+        cg.add(var.set_co2_sensor(sens))
+

tests/test1.yaml

@@ -740,6 +740,10 @@ sensor:
     update_interval: 15s
     iir_filter: 16x
     i2c_id: i2c_bus
+  - platform: cdm7160
+    i2c_id: i2c_bus
+    co2:
+      name: CDM7160 CO2 Value
   - platform: dallas
     address: 0x1C0000031EDD2A28
     name: Living Room Temperature