mirror of
https://github.com/nymea/nymea-plugins.git
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71 lines
2.6 KiB
C++
71 lines
2.6 KiB
C++
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*
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* Copyright 2013 - 2021, nymea GmbH
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* Contact: contact@nymea.io
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*
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* This file is part of nymea.
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* This project including source code and documentation is protected by
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* copyright law, and remains the property of nymea GmbH. All rights, including
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* reproduction, publication, editing and translation, are reserved. The use of
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* this project is subject to the terms of a license agreement to be concluded
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* with nymea GmbH in accordance with the terms of use of nymea GmbH, available
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* under https://nymea.io/license
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*
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* GNU Lesser General Public License Usage
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* Alternatively, this project may be redistributed and/or modified under the
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* terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation; version 3. This project is distributed in the hope that
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* it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this project. If not, see <https://www.gnu.org/licenses/>.
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*
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* For any further details and any questions please contact us under
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* contact@nymea.io or see our FAQ/Licensing Information on
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* https://nymea.io/license/faq
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#include "sht30.h"
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#include "extern-plugininfo.h"
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#include <unistd.h>
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#include <QThread>
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SHT30::SHT30(const QString &portName, int address, QObject *parent) :
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I2CDevice(portName, address, parent)
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{
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}
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QByteArray SHT30::readData(int fileDescriptor)
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{
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// Send measurement command: 0x2C
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// High repeatability measurement: 0x06
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char config[2] = {0};
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config[0] = 0x2C;
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config[1] = 0x06;
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if (write(fileDescriptor, config, 2) != 2) {
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qCWarning(dcI2cDevices()) << "SHT30: could not configure sensor.";
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return QByteArray();
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}
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QThread::msleep(500);
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// Read 6 bytes of data
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// Temperature msb, Temperature lsb, Temperature CRC, Humididty msb, Humidity lsb, Humidity CRC
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char data[6] = {0};
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if (read(fileDescriptor, data, 6) != 6) {
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qCWarning(dcI2cDevices()) << "SHT30: could not read sensor values.";
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return QByteArray();
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}
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// Convert the data
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int temperatureRaw = (data[0] << 8) | data[1];
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double temperature = -45 + (175 * temperatureRaw / 65535.0);
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double humidity = 100 * ((data[3] << 8) | data[4]) / 65535.0;
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emit measurementAvailable(temperature, humidity);
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return QByteArray(data, 6);
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}
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