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TempSensor_LM75B_test.cpp
- Committer:
- okano
- Date:
- 2010-01-23
- Revision:
- 0:b1a5601983d4
File content as of revision 0:b1a5601983d4:
/*
* I2C digital temperature sensor "LM75B" library test app
*
* LM75B is an I2C based digital temperature sensor
* http://www.nxp.com/pip/LM75B_2.html
*
* Expecting to use the pins 9 and 10 for I2C bus
* these pins should be pulled-up properly.
*
* The temperature read out will be shown on terminal on the PC screen.
*
* In this demo code, two LM75B devices can be driven.
* These two devices should have different I2C address setting
* using its address pins (LM75B's A0 to A2 (pins 5 to 7)).
* One LM75B should have all those pins tied to GND.
* And another should have the pin A0(pin7) pulled-up.
*
* From the software, those devices can be accessed by I2C addresses
* "0x90" and "0x92".
* It will not be as "0x90" and "0x91" because the address has
* 7 bit only and stuffed to left. So the "A0" setting become 0xX2.
* The LSB does not care because it will be set by I2C libraly when
* it transfer the data for read and write.
*
* This code is new version that can handle the LM75B are the objects.
*
* Copyright (c) 2010 Tedd OKANO
* Released under the MIT License: http://mbed.org/license/mit
*
* revision 1.0 16-Jan-2010 a. 1st release
* revision 1.1 23-Jan-2010 a. class name has been changed from LM75B to TempSensor_LM75B
* b. copyright notice added
*/
#include "mbed.h"
#include "TempSensor_LM75B.h"
Serial pc(USBTX, USBRX); // tx, rx
I2C i2c( p9, p10 ); // sda, scl
TempSensor_LM75B thermo_sensor_0( &i2c ); // sensor_0 using with default I2C address "0x90".
TempSensor_LM75B thermo_sensor_1( &i2c, 0x92 ); // sensor_1 gaved I2C address since that address pin A0=HIGH.
int main() {
int i = 0;
while (1) {
pc.printf( " (%d) sensor_0= %4.1f, sensor_1= %4.1f(degree-C)\n", i++, (float)thermo_sensor_0, (float)thermo_sensor_1 );
wait( 1 );
}
}