A simply library for the LM75B I2C temperature sensor

Dependents:   LM75B-HelloWorld app-board-Sprint-SMS-LM75B SprintUSBModemWebsocketTest-Temp app-board-Ethernet-Websocket ... more

LM75B.cpp

Committer:
chris
Date:
2012-10-26
Revision:
0:1be38995591b
Child:
1:6a70c9303bbe

File content as of revision 0:1be38995591b:


/*
Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

#include "LM75B.h"

LM75B::LM75B(PinName sda, PinName scl) : i2c(sda, scl)
{
   char cmd[2];
   cmd[0]    = LM75B_Conf;
   cmd[1]    = 0x0;   
   i2c.write( LM75B_ADDR, cmd, 2);
}



LM75B::~LM75B()
{

}

float LM75B::read()
{
    char cmd[2];
    cmd[0] = LM75B_Temp;
   
    i2c.write( LM75B_ADDR, cmd, 1); // Send command string
    i2c.read( LM75B_ADDR, cmd, 2); // Send command string    
    return (   float((cmd[0]<<8)|cmd[1]) / 256.0   );
}