Add Sensirion SEN66 driver (b956db43) · Commits · derf / multipass

Makefile

+4 −0

Original line number	Diff line number	Diff line
		@@ -122,6 +122,10 @@ ifdef CONFIG_driver_sen5x
		CXX_TARGETS += src/driver/sen5x.cc
		endif

		ifdef CONFIG_driver_sen66
		CXX_TARGETS += src/driver/sen66.cc
		endif

		ifdef CONFIG_driver_veml6075
		CXX_TARGETS += src/driver/veml6075.cc
		endif

include/driver/sen66.h

0 → 100644

+102 −0

Original line number	Diff line number	Diff line
		/*
		* 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

src/app/datalogger/main.cc

+62 −0

Original line number	Diff line number	Diff line
		@@ -60,6 +60,9 @@
		#ifdef CONFIG_driver_sen5x
		#include "driver/sen5x.h"
		#endif
		#ifdef CONFIG_driver_sen66
		#include "driver/sen66.h"
		#endif
		#ifdef CONFIG_driver_veml6075
		#include "driver/veml6075.h"
		#endif
		@@ -266,6 +269,61 @@ void loop(void)
		}
		#endif

		#ifdef CONFIG_driver_sen66
		if (sen66.read()) {
		kout << dec;
		if (sen66.co2 != sen66.CO2_INVALID) {
		kout << "CO₂ : " << sen66.co2 << " ppm" << endl;
		}
		if (sen66.pm1 != sen66.PM_INVALID) {
		kout << "PM1.0: " << (sen66.pm1 / 10) << "." << (sen66.pm1 % 10) << " µg/m³" << endl;
		}
		if (sen66.pm2_5 != sen66.PM_INVALID) {
		kout << "PM2.5: " << (sen66.pm2_5 / 10) << "." << (sen66.pm2_5 % 10) << " µg/m³" << endl;
		}
		if (sen66.pm4 != sen66.PM_INVALID) {
		kout << "PM4.0: " << (sen66.pm4 / 10) << "." << (sen66.pm4 % 10) << " µg/m³" << endl;
		}
		if (sen66.pm10 != sen66.PM_INVALID) {
		kout << "PM10 : " << (sen66.pm10 / 10) << "." << (sen66.pm10 % 10) << " µg/m³" << endl;
		}
		if (sen66.humidity != sen66.HUMIDITY_INVALID) {
		kout << "Humidity: " << (sen66.humidity / 100) << "." << ((sen66.humidity % 100) / 10) << " %" << endl;
		}
		if (sen66.temperature != sen66.TEMPERATURE_INVALID) {
		kout << "Temperature: " << (sen66.temperature / 200) << "." << ((sen66.temperature % 200) / 20) << " °c" << endl;
		}
		if (sen66.voc != sen66.VOC_INVALID) {
		kout << "VOC index: " << (sen66.voc / 10) << "." << (sen66.voc % 10) << endl;
		}
		if (sen66.nox != sen66.NOX_INVALID) {
		kout << "NOx index: " << (sen66.nox / 10) << "." << (sen66.nox % 10) << endl;
		}
		} else {
		kout << "SEN66 error" << endl;
		}
		if (sen66.readStatus()) {
		if (sen66.fan_speed_warning) {
		kout << "SEN66 warning: fan speed out of range" << endl;
		}
		if (sen66.co2_sensor_error) {
		kout << "SEN66 error: CO₂ sensor" << endl;
		}
		if (sen66.gas_sensor_error) {
		kout << "SEN66 error: Gas (VOC, NOx) sensor" << endl;
		}
		if (sen66.rht_sensor_error) {
		kout << "SEN66 error: Temperature and Humidity sensor" << endl;
		}
		if (sen66.pm_sensor_error) {
		kout << "SEN66 error: PM sensor" << endl;
		}
		if (sen66.fan_error) {
		kout << "SEN66 error: Fan" << endl;
		}
		}
		#endif

		#ifdef CONFIG_driver_veml6075
		float uva, uvb;
		if (veml6075.readUV(&uva, &uvb)) {
		@@ -392,6 +450,10 @@ int main(void)
		sen5x.start();
		#endif

		#ifdef CONFIG_driver_sen66
		sen66.start();
		#endif

		#ifdef CONFIG_driver_veml6075
		veml6075.init();
		#endif

src/driver/Kconfig

+4 −0

Original line number	Diff line number	Diff line
		@@ -145,6 +145,10 @@ config driver_sen5x
		bool "Sensirion SEN5x PM Sensor"
		depends on meta_driver_i2c

		config driver_sen66
		bool "Sensirion SEN66 PM+CO2 Sensor"
		depends on meta_driver_i2c

		config driver_veml6075
		bool "VEML6075 UV Sensor"
		depends on meta_driver_i2c

src/driver/sen66.cc

0 → 100644

+113 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright 2025 Birte Kristina Friesel
		*
		* SPDX-License-Identifier: BSD-2-Clause
		*/
		#include "arch.h"
		#include "driver/sen66.h"
		#if defined(CONFIG_meta_driver_hardware_i2c)
		#include "driver/i2c.h"
		#elif defined(CONFIG_driver_softi2c)
		#include "driver/soft_i2c.h"
		#endif

		void SEN66::cleanFan()
		{
		txbuf[0] = 0x56;
		txbuf[1] = 0x07;
		i2c.xmit(address, 2, txbuf, 0, rxbuf);
		}

		void SEN66::start()
		{
		txbuf[0] = 0x00;
		txbuf[1] = 0x21;
		i2c.xmit(address, 2, txbuf, 0, rxbuf);
		}

		void SEN66::stop()
		{
		txbuf[0] = 0x01;
		txbuf[1] = 0x04;
		i2c.xmit(address, 2, txbuf, 0, rxbuf);
		}

		bool SEN66::read()
		{
		txbuf[0] = 0x03;
		txbuf[1] = 0x00;

		if (i2c.xmit(address, 2, txbuf, 0, rxbuf)) {
		return false;
		}
		arch.delay_ms(20);
		if (i2c.xmit(address, 0, txbuf, 27, rxbuf)) {
		return false;
		}

		if (!crcValid(rxbuf, 27)) {
		return false;
		}

		pm1 = (rxbuf[0] << 8) + rxbuf[1];
		pm2_5 = (rxbuf[3] << 8) + rxbuf[4];
		pm4 = (rxbuf[6] << 8) + rxbuf[7];
		pm10 = (rxbuf[9] << 8) + rxbuf[10];
		humidity = (rxbuf[12] << 8) + rxbuf[13];
		temperature = (rxbuf[15] << 8) + rxbuf[16];
		voc = (rxbuf[18] << 8) + rxbuf[19];
		nox = (rxbuf[21] << 8) + rxbuf[22];
		co2 = (rxbuf[24] << 8) + rxbuf[25];
		return true;
		}

		bool SEN66::readStatus()
		{
		txbuf[0] = 0xd2;
		txbuf[1] = 0x06;
		if (i2c.xmit(address, 2, txbuf, 0, rxbuf)) {
		return false;
		}
		arch.delay_ms(20);
		if (i2c.xmit(address, 0, txbuf, 6, rxbuf)) {
		return false;
		}

		if (!crcValid(rxbuf, 6)) {
		return false;
		}

		fan_speed_warning = rxbuf[1] & 0x20;
		co2_sensor_error = rxbuf[3] & 0x12;
		pm_sensor_error = rxbuf[3] & 0x08;
		gas_sensor_error = rxbuf[4] & 0x80;
		rht_sensor_error = rxbuf[4] & 0x40;
		fan_error = rxbuf[4] & 0x10;

		return true;
		}

		unsigned char SEN66::crcWord(unsigned char byte1, unsigned char byte2)
		{
		unsigned char crc = 0xff ^ byte1;
		for (unsigned char bit = 8; bit > 0; bit--) {
		crc = (crc << 1) ^ (crc & 0x80 ? 0x31 : 0);
		}
		crc ^= byte2;
		for (unsigned char bit = 8; bit > 0; bit--) {
		crc = (crc << 1) ^ (crc & 0x80 ? 0x31 : 0);
		}
		return crc;
		}

		bool SEN66::crcValid(unsigned char* data, unsigned char length)
		{
		for (unsigned char i = 0; i < length; i += 3) {
		if (crcWord(data[i], data[i+1]) != data[i+2]) {
		return false;
		}
		}
		return true;
		}

		SEN66 sen66;

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