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79 lines
2.8 KiB
79 lines
2.8 KiB
3 years ago
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/*
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The MIT License (MIT)
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Copyright (c) 2016 winlin
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#ifndef __SIMPLE_DHT_H
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#define __SIMPLE_DHT_H
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#include <Arduino.h>
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/*
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Simple DHT11
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Simple, Stable and Fast DHT11 library.
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The circuit:
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* VCC: 5V or 3V
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* GND: GND
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* DATA: Digital ping, for example, 2.
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23 Jan 2016 By winlin <winlin@vip.126.com>
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https://github.com/winlinvip/SimpleDHT#usage
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*/
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class SimpleDHT11 {
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public:
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// to read from dht11.
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// @param pin the DHT11 pin.
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// @param ptemperature output, NULL to igore.
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// @param phumidity output, NULL to ignore.
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// @param pdata output 40bits sample, NULL to ignore.
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// @remark the min delay for this method is 1s.
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int read(int pin, byte* ptemperature, byte* phumidity, byte pdata[40]);
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private:
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// confirm the OUTPUT is level in us,
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// for example, when DHT11 start sample, it will
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// 1. PULL LOW 80us, call confirm(pin, 80, LOW)
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// 2. PULL HIGH 80us, call confirm(pin, 80, HIGH)
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// @return 0 success; oterwise, error.
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// @remark should never used to read bits,
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// for function call use more time, maybe never got bit0.
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// @remark please use simple_dht11_read().
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int confirm(int pin, int us, byte level);
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// @data the bits of a byte.
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// @remark please use simple_dht11_read().
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byte bits2byte(byte data[8]);
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// read temperature and humidity from dht11.
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// @param pin the pin for DHT11, for example, 2.
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// @param data a byte[40] to read bits to 5bytes.
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// @return 0 success; otherwise, error.
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// @remark please use simple_dht11_read().
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int sample(int pin, byte data[40]);
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// parse the 40bits data to temperature and humidity.
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// @remark please use simple_dht11_read().
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int parse(byte data[40], byte* ptemperature, byte* phumidity);
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};
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#endif
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