42 lines
1.6 KiB
C
42 lines
1.6 KiB
C
/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/** library to query measurements from Aosong DHT22 (aka. AM2302) temperature and relative humidity sensor (API)
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* @file sensor_dht22.h
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2017
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* @note peripherals used: timer channel @ref sensor_dht22_timer (add external pull-up resistor)
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*/
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#pragma once
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/** a measurement response has been received */
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extern volatile bool sensor_dht22_measurement_received;
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/** measurement returned by sensor */
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struct sensor_dht22_measurement_t {
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float humidity; /**< relative humidity in %RH (0-100) */
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float temperature; /**< temperature in °C (-40-80) */
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};
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/** setup peripherals to communicate with sensor */
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void sensor_dht22_setup(void);
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/** request measurement from sensor
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* @return request started successfully
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*/
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bool sensor_dht22_measurement_request(void);
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/** decode received measurement
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* @return decoded measurement (0xff,0xff if invalid)
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*/
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struct sensor_dht22_measurement_t sensor_dht22_measurement_decode(void);
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