app: integrate SEN0466 CO sensor into sensor module

Add SEN0466 electrochemical CO sensor support to the fire detection
system with CO concentration and temperature data reading.

Changes:
- Add SENSOR_TYPE_SEN0466 enum and sensor info entry
- Implement CO/temperature channel reading with graceful error handling
- Add 5000ms warmup configuration for electrochemical sensor
- Enable SEN0466 in device tree (I2C 0x74) and project config
- Extend sensor message structure and controller logging

The SEN0466 provides CO measurements (0-1000 ppm) and optional
temperature readings through the unified sensor module framework.

Refs: #19

Signed-off-by: Natalia Pluta <pluta.natalia.m@gmail.com>

Author: nmpluta

app/boards/nrf9160dk_nrf9160.overlay

@@ -46,6 +46,12 @@
 		reg = <0x40>;
 		status = "okay";
 	};
+
+	sen0466: sen0466@74 {
+		compatible = "dfrobot,sen0466";
+		reg = <0x74>;
+		status = "okay";
+	};
 };
 
 / {

app/prj.conf

@@ -13,6 +13,7 @@ CONFIG_BME280=y
 CONFIG_CCS811=y
 CONFIG_CCS811_ENV_COMPENSATION=y
 CONFIG_HM330X=y
+CONFIG_SEN0466=y
 
 # Enable ZBUS for inter-module communication
 CONFIG_ZBUS=y

app/src/modules/controller/controller_module.c

@@ -343,6 +343,10 @@ static void log_sensor_data(const struct sensor_msg *msg)
 	LOG_INF("HM3301: PM1.0: %d ug/m3, PM2.5: %d ug/m3, PM10: %d ug/m3", msg->pm1_0.val1,
 		msg->pm2_5.val1, msg->pm10.val1);
 
+	/* Log SEN0466 data */
+	LOG_INF("SEN0466: CO: %d ppm, Temp: %d.%06d C", msg->co.val1, msg->temperature_sen0466.val1,
+		msg->temperature_sen0466.val2);
+
 	LOG_INF("Sensor data timestamp: %lld ms", msg->timestamp);
 }
 

app/src/modules/sensor/Kconfig.sensor

@@ -76,6 +76,14 @@ config SENSOR_MODULE_HM3301_WARMUP_MS
 	help
 	  Warmup time required for HM3301 sensor before first valid reading.
 
+config SENSOR_MODULE_SEN0466_WARMUP_MS
+	int "SEN0466 warmup period (ms)"
+	default 5000
+	depends on SENSOR_MODULE_WARMUP_ENABLE
+	help
+	  Warmup time required for SEN0466 CO sensor before first valid reading.
+	  Electrochemical CO sensors typically need stabilization time.
+
 config CCS811_ENV_COMPENSATION
 	bool "Enable environmental compensation for CCS811"
 	default y

app/src/modules/sensor/sensor_module.c

@@ -5,6 +5,7 @@
 
 #include "sensor_module.h"
 #include <zephyr/drivers/sensor/ccs811.h>
+#include <zephyr/drivers/sensor/sen0466.h>
 #include <zephyr/logging/log.h>
 #include <zephyr/smf.h>
 
@@ -113,8 +114,11 @@ static struct sensor_info sensors[SENSOR_TYPE_COUNT] = {
 	[SENSOR_TYPE_CCS811] = {.device = DEVICE_DT_GET(DT_NODELABEL(ccs811)),
 				.health = {0},
 				.enabled = true},
-	[SENSOR_TYPE_HM3301] = {
-		.device = DEVICE_DT_GET(DT_NODELABEL(hm3301)), .health = {0}, .enabled = true}};
+	[SENSOR_TYPE_HM3301] = {.device = DEVICE_DT_GET(DT_NODELABEL(hm3301)),
+				.health = {0},
+				.enabled = true},
+	[SENSOR_TYPE_SEN0466] = {
+		.device = DEVICE_DT_GET(DT_NODELABEL(sen0466)), .health = {0}, .enabled = true}};
 
 /* Thread stack and data */
 static K_THREAD_STACK_DEFINE(sensor_thread_stack, CONFIG_SENSOR_MODULE_STACK_SIZE);
@@ -573,6 +577,22 @@ static int read_sensor_data(enum sensor_type type, struct sensor_msg *data)
 		}
 		break;
 
+	case SENSOR_TYPE_SEN0466:
+		ret = sensor_channel_get(device, SENSOR_CHAN_SEN0466_CO, &data->co);
+		if (ret < 0) {
+			LOG_ERR("Could not get CO (%d)", ret);
+			return ret;
+		}
+
+		/* Optionally read temperature if available */
+		ret = sensor_channel_get(device, SENSOR_CHAN_SEN0466_TEMP,
+					 &data->temperature_sen0466);
+		if (ret < 0) {
+			LOG_DBG("SEN0466 temperature not available (%d)", ret);
+			/* Temperature reading is optional, don't fail */
+		}
+		break;
+
 	default:
 		LOG_ERR("Unknown sensor type: %d", type);
 		return -EINVAL;
@@ -752,6 +772,8 @@ static const char *get_sensor_name(enum sensor_type type)
 		return "CCS811";
 	case SENSOR_TYPE_HM3301:
 		return "HM3301";
+	case SENSOR_TYPE_SEN0466:
+		return "SEN0466";
 	default:
 		return "Unknown";
 	}
@@ -775,6 +797,8 @@ static int64_t get_sensor_warmup_time(enum sensor_type type)
 		return CONFIG_SENSOR_MODULE_CCS811_WARMUP_MS;
 	case SENSOR_TYPE_HM3301:
 		return CONFIG_SENSOR_MODULE_HM3301_WARMUP_MS;
+	case SENSOR_TYPE_SEN0466:
+		return CONFIG_SENSOR_MODULE_SEN0466_WARMUP_MS;
 	default:
 		return 0;
 	}

app/src/modules/sensor/sensor_module.h

@@ -28,6 +28,7 @@ enum sensor_type {
 	SENSOR_TYPE_BME280 = 0,
 	SENSOR_TYPE_CCS811,
 	SENSOR_TYPE_HM3301,
+	SENSOR_TYPE_SEN0466,
 	SENSOR_TYPE_COUNT /* Keep this last - represents total number of sensors */
 };
 
@@ -65,6 +66,8 @@ struct sensor_msg {
 	struct sensor_value pm1_0;
 	struct sensor_value pm2_5;
 	struct sensor_value pm10;
+	struct sensor_value co;
+	struct sensor_value temperature_sen0466;
 
 	/* Timestamp - only valid for SENSOR_SAMPLE_RESPONSE */
 	int64_t timestamp;