sht11.h

00001 /*
00002  * Copyright (c) 2007, Swedish Institute of Computer Science
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * @(#)$Id: sht11.h,v 1.2 2008/07/08 08:23:47 adamdunkels Exp $
00030  */
00031 
00032 #ifndef SHT11_H
00033 #define SHT11_H
00034 
00035 void sht11_init(void);
00036 void sht11_off(void);
00037 
00038 unsigned int sht11_temp(void);
00039 unsigned int sht11_humidity(void);
00040 unsigned int sht11_sreg(void);
00041 int      sht11_set_sreg(unsigned);
00042 
00043 /*
00044  * Relative Humidity in percent (h in 12 bits resolution)
00045  * RH = -4 + 0.0405*h - 2.8e-6*(h*h)
00046  *
00047  * Temperature in Celsius (t in 14 bits resolution at 3 Volts)
00048  * T = -39.60 + 0.01*t
00049  */
00050 
00051 #endif /* SHT11_H */

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