Add CUBIC CM1106 Single Beam NDIR CO2 Sensor Module

CODEOWNERS

@@ -95,6 +95,7 @@ esphome/components/cd74hc4067/* @asoehlke
 esphome/components/ch422g/* @clydebarrow @jesterret
 esphome/components/climate/* @esphome/core
 esphome/components/climate_ir/* @glmnet
+esphome/components/cm1106/* @andrewjswan
 esphome/components/color_temperature/* @jesserockz
 esphome/components/combination/* @Cat-Ion @kahrendt
 esphome/components/coolix/* @glmnet

esphome/components/cm1106/__init__.py

@@ -0,0 +1 @@
+"""CM1106 component for ESPHome."""

esphome/components/cm1106/cm1106.cpp

@@ -0,0 +1,94 @@
+#include "cm1106.h"
+#include "esphome/core/log.h"
+
+#include <cinttypes>
+
+namespace esphome {
+namespace cm1106 {
+
+uint8_t cm1106_checksum(const uint8_t *response, size_t len) {
+  uint8_t crc = 0;
+  for (int i = 0; i < len - 1; i++) {
+    crc -= response[i];
+  }
+  return crc;
+}
+
+void CM1106Component::update() {
+  uint8_t response[8] = {0};
+  if (!this->cm1106_write_command_(c_m1106_cmd_get_c_o2_, sizeof(c_m1106_cmd_get_c_o2_), response, sizeof(response))) {
+    ESP_LOGW(TAG, "Reading data from CM1106 failed!");
+    this->status_set_warning();
+    return;
+  }
+
+  if (!(response[0] == 0x16 && response[1] == 0x05 && response[2] == 0x01)) {
+    ESP_LOGW(TAG, "Got wrong UART response from CM1106: %02X %02X %02X %02X...", response[0], response[1], response[2],
+             response[3]);
+    this->status_set_warning();
+    return;
+  }
+
+  uint8_t checksum = cm1106_checksum(response, sizeof(response));
+  if (response[7] != checksum) {
+    ESP_LOGW(TAG, "CM1106 Checksum doesn't match: 0x%02X!=0x%02X", response[7], checksum);
+    this->status_set_warning();
+    return;
+  }
+
+  this->status_clear_warning();
+
+  int16_t ppm = response[3] << 8 | response[4];
+  ESP_LOGD(TAG, "CM1106 Received CO₂=%uppm DF3=%02X DF4=%02X", ppm, response[5], response[6]);
+  if (this->co2_sensor_ != nullptr)
+    this->co2_sensor_->publish_state(ppm);
+}
+
+void CM1106Component::calibrate_zero(uint16_t ppm) {
+  uint8_t cmd[6];
+  memcpy(cmd, c_m1106_cmd_set_c_o2_calib_, sizeof(cmd));
+  cmd[3] = ppm >> 8;
+  cmd[4] = ppm & 0xFF;
+  uint8_t response[4] = {0};
+
+  if (!this->cm1106_write_command_(cmd, sizeof(cmd), response, sizeof(response))) {
+    ESP_LOGW(TAG, "Reading data from CM1106 failed!");
+    this->status_set_warning();
+    return;
+  }
+
+  // check if correct response received
+  if (memcmp(response, c_m1106_cmd_set_c_o2_calib_response_, sizeof(response)) != 0) {
+    ESP_LOGW(TAG, "Got wrong UART response from CM1106: %02X %02X %02X %02X", response[0], response[1], response[2],
+             response[3]);
+    this->status_set_warning();
+    return;
+  }
+
+  this->status_clear_warning();
+  ESP_LOGD(TAG, "CM1106 Successfully calibrated sensor to %uppm", ppm);
+}
+
+bool CM1106Component::cm1106_write_command_(uint8_t *command, size_t command_len, uint8_t *response,
+                                            size_t response_len) {
+  // Empty RX Buffer
+  while (this->available())
+    this->read();
+  command[command_len - 1] = cm1106_checksum(command, command_len);
+  this->write_array(command, command_len);
+  this->flush();
+
+  if (response == nullptr)
+    return true;
+
+  return this->read_array(response, response_len);
+}
+
+void CM1106Component::dump_config() {
+  ESP_LOGCONFIG(TAG, "CM1106:");
+  LOG_SENSOR("  ", "CO2", this->co2_sensor_);
+  this->check_uart_settings(9600);
+}
+
+}  // namespace cm1106
+}  // namespace esphome

esphome/components/cm1106/cm1106.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/core/automation.h"
+#include "esphome/components/sensor/sensor.h"
+#include "esphome/components/uart/uart.h"
+
+namespace esphome {
+namespace cm1106 {
+
+static const char *const TAG = "cm1106";
+
+class CM1106Component : public PollingComponent, public uart::UARTDevice {
+ public:
+  float get_setup_priority() const override { return esphome::setup_priority::DATA; }
+
+  void update() override;
+  void dump_config() override;
+
+  void calibrate_zero(uint16_t ppm);
+
+  void set_co2_sensor(sensor::Sensor *co2_sensor) { co2_sensor_ = co2_sensor; }
+
+ private:
+  uint8_t c_m1106_cmd_get_c_o2_[4] = {0x11, 0x01, 0x01, 0xED};
+  uint8_t c_m1106_cmd_set_c_o2_calib_[6] = {0x11, 0x03, 0x03, 0x00, 0x00, 0x00};
+  uint8_t c_m1106_cmd_set_c_o2_calib_response_[4] = {0x16, 0x01, 0x03, 0xE6};
+
+ protected:
+  bool cm1106_write_command_(uint8_t *command, size_t command_len, uint8_t *response, size_t response_len);
+
+  sensor::Sensor *co2_sensor_{nullptr};
+};
+
+template<typename... Ts> class CM1106CalibrateZeroAction : public Action<Ts...> {
+ public:
+  CM1106CalibrateZeroAction(CM1106Component *cm1106) : cm1106_(cm1106) {}
+
+  void play(Ts... x) override { this->cm1106_->calibrate_zero(400); }
+
+ protected:
+  CM1106Component *cm1106_;
+};
+
+}  // namespace cm1106
+}  // namespace esphome

esphome/components/cm1106/sensor.py

@@ -0,0 +1,78 @@
+"""CM1106 Sensor component for ESPHome."""
+
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome import automation
+from esphome.automation import maybe_simple_id
+from esphome.components import sensor, uart
+from esphome.const import (
+    CONF_CO2,
+    CONF_ID,
+    DEVICE_CLASS_CARBON_DIOXIDE,
+    ICON_MOLECULE_CO2,
+    STATE_CLASS_MEASUREMENT,
+    UNIT_PARTS_PER_MILLION,
+)
+
+DEPENDENCIES = ["uart"]
+CODEOWNERS = ["@andrewjswan"]
+
+CONF_AUTOMATIC_BASELINE_CALIBRATION = "automatic_baseline_calibration"
+
+cm1106_ns = cg.esphome_ns.namespace("cm1106")
+CM1106Component = cm1106_ns.class_(
+    "CM1106Component", cg.PollingComponent, uart.UARTDevice
+)
+CM1106CalibrateZeroAction = cm1106_ns.class_(
+    "CM1106CalibrateZeroAction",
+    automation.Action,
+)
+CM1106ABCEnableAction = cm1106_ns.class_("CM1106ABCEnableAction", automation.Action)
+CM1106ABCDisableAction = cm1106_ns.class_("CM1106ABCDisableAction", automation.Action)
+
+CONFIG_SCHEMA = (
+    cv.Schema(
+        {
+            cv.GenerateID(): cv.declare_id(CM1106Component),
+            cv.Required(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,
+            ),
+            cv.Optional(CONF_AUTOMATIC_BASELINE_CALIBRATION): cv.boolean,
+        },
+    )
+    .extend(cv.polling_component_schema("60s"))
+    .extend(uart.UART_DEVICE_SCHEMA)
+)
+
+
+async def to_code(config) -> None:
+    """Code generation entry point."""
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    await uart.register_uart_device(var, config)
+
+    if CONF_CO2 in config:
+        sens = await sensor.new_sensor(config[CONF_CO2])
+        cg.add(var.set_co2_sensor(sens))
+
+
+CALIBRATION_ACTION_SCHEMA = maybe_simple_id(
+    {
+        cv.Required(CONF_ID): cv.use_id(CM1106Component),
+    },
+)
+
+
+@automation.register_action(
+    "cm1106.calibrate_zero",
+    CM1106CalibrateZeroAction,
+    CALIBRATION_ACTION_SCHEMA,
+)
+async def cm1106_calibration_to_code(config, action_id, template_arg, args) -> None:  # noqa: ARG001
+    """Service code generation entry point."""
+    paren = await cg.get_variable(config[CONF_ID])
+    return cg.new_Pvariable(action_id, template_arg, paren)

tests/components/cm1106/common.yaml

@@ -0,0 +1,11 @@
+uart:
+  - id: uart_cm1106
+    tx_pin: ${tx_pin}
+    rx_pin: ${rx_pin}
+    baud_rate: 9600
+
+sensor:
+  - platform: cm1106
+    co2:
+      name: CM1106 CO2 Value
+    update_interval: 15s

tests/components/cm1106/test.esp32-ard.yaml

@@ -0,0 +1,5 @@
+substitutions:
+  tx_pin: GPIO17
+  rx_pin: GPIO16
+
+<<: !include common.yaml

tests/components/cm1106/test.esp32-c3-ard.yaml

@@ -0,0 +1,5 @@
+substitutions:
+  tx_pin: GPIO4
+  rx_pin: GPIO5
+
+<<: !include common.yaml

tests/components/cm1106/test.esp32-c3-idf.yaml

@@ -0,0 +1,5 @@
+substitutions:
+  tx_pin: GPIO4
+  rx_pin: GPIO5
+
+<<: !include common.yaml

tests/components/cm1106/test.esp32-idf.yaml

@@ -0,0 +1,5 @@
+substitutions:
+  tx_pin: GPIO17
+  rx_pin: GPIO16
+
+<<: !include common.yaml

tests/components/cm1106/test.esp8266-ard.yaml

@@ -0,0 +1,5 @@
+substitutions:
+  tx_pin: GPIO4
+  rx_pin: GPIO5
+
+<<: !include common.yaml

tests/components/cm1106/test.rp2040-ard.yaml

@@ -0,0 +1,5 @@
+substitutions:
+  tx_pin: GPIO4
+  rx_pin: GPIO5
+
+<<: !include common.yaml