Add Sensirion SEN66 driver

1 files changed, 102 insertions, 0 deletions

diff --git a/include/driver/sen66.h b/include/driver/sen66.h
new file mode 100644
index 0000000..117c32b
--- /dev/null
+++ b/include/driver/sen66.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright 2025 Birte Kristina Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#ifndef SEN66_H
+#define SEN66_H
+
+class SEN66 {
+	private:
+		SEN66(const SEN66 &copy);
+		unsigned char const address = 0x6b;
+		unsigned char txbuf[2];
+		unsigned char rxbuf[27];
+
+		unsigned char crcWord(unsigned char byte1, unsigned char byte2);
+		bool crcValid(unsigned char* data, unsigned char length);
+
+	public:
+		SEN66() {}
+
+		unsigned short const PM_INVALID = 0xffff;
+		signed short const TEMPERATURE_INVALID = 0x7fff;
+		signed short const HUMIDITY_INVALID = 0x7fff;
+		signed short const VOC_INVALID = 0x7fff;
+		signed short const NOX_INVALID = 0x7fff;
+		signed short const CO2_INVALID = 0xffff;
+
+		struct {
+			unsigned int fan_speed_warning : 1;
+			unsigned int gas_sensor_error : 1;
+			unsigned int rht_sensor_error : 1;
+			unsigned int co2_sensor_error : 1;
+			unsigned int pm_sensor_error : 1;
+			unsigned int fan_error : 1;
+		};
+
+		/*
+		 * PM1.0 value, scaled by 10.
+		 * PM1.0 [µg/m³] = pm10 / 10
+		 */
+		unsigned short pm1;
+
+		/*
+		 * PM2.5 value, scaled by 10.
+		 * PM2.5 [µg/m3] = pm2_5 / 10
+		 */
+		unsigned short pm2_5;
+
+		/*
+		 * PM4.0 value, scaled by 10.
+		 * PM4.0 [µg/m3] = pm4 / 10
+		 */
+		unsigned short pm4;
+
+		/*
+		 * PM10 value, scaled by 10.
+		 * PM10 [µg/m3] = pm10 / 10
+		 */
+		unsigned short pm10;
+
+		/*
+		 * Temperature, scaled by 200.
+		 * Temperature [°c] = temperature / 200
+		 */
+		signed short temperature;
+
+		/*
+		 * Relative Humidity, scaled by 100.
+		 * Relative Humidity [%] = humidity / 100
+		 */
+		signed short humidity;
+
+		/*
+		 * VOC Index, scaled by 10.
+		 * VOC index = voc / 10
+		 */
+		signed short voc;
+
+		/*
+		 * NOx Index, scaled by 10.
+		 * NOx index = nox / 10
+		 */
+		signed short nox;
+
+		/*
+		 * CO₂ concentration [ppm].
+		 */
+		unsigned short co2;
+
+		void start();
+		void stop();
+
+		void cleanFan();
+
+		bool read();
+		bool readStatus();
+};
+
+extern SEN66 sen66;
+
+#endif