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Initial SCD30 Support

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seiichiro 2021-03-31 16:07:14 +02:00
parent c63132ebe0
commit b3ae34e730
3 changed files with 233 additions and 2 deletions
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155
lib/SCD30/SCD30.cpp Normal file
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/*
SCD30.cpp - Sensirion SCD30 CO2-Sensor Library
Copyright (c) 2020-2021, Stefan Brand
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Arduino.h>
#include <inttypes.h>
#include <Wire.h>
#include "SCD30.h"
// Default Constructor
SCD30::SCD30() {};
// Constructor with Measuring Interval and Autocalibration Status
SCD30::SCD30(uint8_t interval, bool selfcalib) {
this->interval = interval;
this->selfcalib = selfcalib;
}
// Initialize the Sensor, Enable Constant Measurement, Set Autocalibration and Interval
void SCD30::initialize(void) {
uint8_t fw[3];
// Soft Reset
reset();
// Send Get Firmware, Workaround to Avoid First Real Command to be Ignored
getBytes(SCD30_GET_FW_VER, fw, 3);
delay(10);
// Start Continous Measurement
sendCmd(SCD30_CONT_MEASURE, 0);
// Enable/Disable Autocalibration
if (selfcalib) {
sendCmd(SCD30_AUTOCAL, 1);
} else {
sendCmd(SCD30_AUTOCAL, 0);
}
delay(10);
// Measurement Interval
sendCmd(SCD30_SET_INTERVAL, interval);
}
// Read Data From Sensor and Put Them Into the Payload Array
uint8_t SCD30::getSensorData(char *payload, uint8_t startbyte) {
uint8_t ready[2] = {0};
uint8_t data[18] = {0};
// Check if Sensor Data is Available
getBytes(SCD30_DATA_READY, ready, 2);
if (ready[1] == 1){
// Get All Measurements (18 Bytes)
getBytes(SCD30_GET_MEASURE, data, 18);
// CO2 PPM
int16_t value = (int16_t)(byteToFloat(data[0], data[1], data[3], data[4]));
int16ToPayload(value, payload, startbyte);
// Temperature
value = (int16_t)(byteToFloat(data[6], data[7], data[9], data[10])*100);
int16ToPayload(value, payload, startbyte+2);
// Humidity
value = (int16_t)(byteToFloat(data[12], data[13], data[15], data[16])*100);
int16ToPayload(value, payload, startbyte+4);
}
return startbyte+6;
}
// Calibrate the Sensor to 400ppm (Outside Level)
void SCD30::calibrate() {
sendCmd(SCD30_SET_RECALIB, 400);
}
// Sensor Soft Reset
void SCD30::reset(void) {
sendCmd(SCD30_RESET);
delay(2000); // Bootup Time
}
// Send a Command with Argument
void SCD30::sendCmd(uint16_t cmd, uint16_t arg) {
uint8_t args[2], crc;
args[0] = (arg >> 8);
args[1] = (arg & 0xFF);
crc = calcCrc(args, 2);
Wire.beginTransmission(SCD30_ADDR);
Wire.write(cmd >> 8);
Wire.write(cmd & 0xFF);
Wire.write(args[0]);
Wire.write(args[1]);
Wire.write(crc);
Wire.endTransmission();
}
// Send only a Command
void SCD30::sendCmd(uint16_t cmd) {
Wire.beginTransmission(SCD30_ADDR);
Wire.write(cmd >> 8);
Wire.write(cmd & 0xFF);
Wire.endTransmission();
}
// Read len Number of Bytes from Register reg into Array bytes
void SCD30::getBytes(uint16_t reg, uint8_t bytes[], uint8_t len) {
sendCmd(reg);
delay(3);
Wire.requestFrom((uint8_t)SCD30_ADDR, (uint8_t)len);
if (Wire.available()) {
for (uint8_t i = 0; i<len; i++)
bytes[i] = Wire.read();
}
}
// Calculate CRC8
uint8_t SCD30::calcCrc(uint8_t bytes[], uint8_t len) {
uint8_t crc8 = 0xFF;
for (uint8_t i = 0; i < len; i++)
{
crc8 ^= bytes[i];
for (uint8_t j = 0; j < 8; j++)
{
if (crc8 & 0x80)
crc8 = (uint8_t)((crc8 << 1) ^ 0x31);
else
crc8 <<= 1;
}
}
return crc8;
}
// Convert 4 Bytes from the Measurement to a Float Value
float SCD30::byteToFloat(uint8_t mmsb, uint8_t mlsb, uint8_t lmsb, uint8_t llsb) {
uint32_t iValue = (uint32_t)((((uint32_t)mmsb) << 24) | (((uint32_t)mlsb) << 16) | (((uint32_t)lmsb) << 8) | ((uint32_t)llsb));
float fValue = *(float*)&iValue;
return fValue;
}

69
lib/SCD30/SCD30.h Normal file
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/*
SCD30.h - Sensirion SCD30 CO2-Sensor Library
Copyright (c) 2020-2021, Stefan Brand
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SCD30_H
#define SCD30_H
#include "../../include/attsensor.h"
// Sensor I2C Address
#define SCD30_ADDR 0x61
// Commands and Registers
#define SCD30_CONT_MEASURE 0x0010
#define SCD30_SET_INTERVAL 0x4600
#define SCD30_DATA_READY 0x0202
#define SCD30_GET_MEASURE 0x0300
#define SCD30_AUTOCAL 0x5306
#define SCD30_SET_RECALIB 0x5204
#define SCD30_SET_TEMPOFFSET 0x5403
#define SCD30_SET_ALTCOMP 0x5102
#define SCD30_RESET 0xD304
#define SCD30_STOP_MEAS 0x0104
#define SCD30_GET_FW_VER 0xD100
class SCD30 : public AttSensor {
private:
bool selfcalib = false;
uint16_t interval = 2;
void reset(void);
void sendCmd(uint16_t cmd, uint16_t arg);
void sendCmd(uint16_t cmd);
void getBytes(uint16_t register, uint8_t bytes[], uint8_t len);
uint8_t calcCrc(uint8_t bytes[], uint8_t len);
float byteToFloat(uint8_t mmsb, uint8_t mlsb, uint8_t lmsb, uint8_t llsb);
public:
SCD30();
SCD30(uint8_t interval, bool selfcalib);
void initialize(void);
uint8_t numBytes(void) {return 6;};
uint8_t getSensorData(char *payload, uint8_t startbyte);
void calibrate();
};
#endif

11
src/main.cpp
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@ -27,6 +27,9 @@
#ifdef HAS_SENSAIRS8 #ifdef HAS_SENSAIRS8
#include <SENSAIRS8.h> #include <SENSAIRS8.h>
#endif #endif
#ifdef HAS_SCD30
#include <SCD30.h>
#endif
#ifdef HAS_BME280 #ifdef HAS_BME280
#include <BME280.h> #include <BME280.h>
#endif #endif
@ -301,12 +304,16 @@ void setup()
sensors[i] = new SENSAIRS8(); sensors[i] = new SENSAIRS8();
i++; i++;
#endif #endif
#ifdef HAS_BME280 #ifdef HAS_SCD30
sensors[i] = new SCD30();
i++;
#endif
#ifdef HAS_BME280
sensors[i] = new BME280(); sensors[i] = new BME280();
i++; i++;
#endif #endif
#ifdef HAS_SHT21 #ifdef HAS_SHT21
sensors[i] = new SHT21() sensors[i] = new SHT21();
i++; i++;
#endif #endif
#ifdef HAS_DS18B20 #ifdef HAS_DS18B20