main.cpp

00001 /* Copyright (c) 2010-2011 mbed.org, MIT License
00002 *
00003 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004 * and associated documentation files (the "Software"), to deal in the Software without
00005 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
00006 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
00007 * Software is furnished to do so, subject to the following conditions:
00008 *
00009 * The above copyright notice and this permission notice shall be included in all copies or
00010 * substantial portions of the Software.
00011 *
00012 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017 */
00018 
00019 #include "mbed.h"
00020 #include "freetronicsLCDShield.h"
00021 
00022 Serial pc(SERIAL_TX, SERIAL_RX);
00023 
00024 DigitalOut myled(LED1);
00025 AnalogIn analog_value(A0);
00026 
00027 #define MV(x) ((0xFFF*x)/3300)
00028 #define V25 1.398
00029 #define SLOPE 0.0043
00030 
00031 int main()
00032 {
00033     wait(0.1);
00034 
00035     freetronicsLCDShield lcd(D6, D7, D2, D3, D4, D5, D8, A1);
00036     // turn on the back light (it's off by default)
00037     lcd.setBackLight(true);
00038 
00039 
00040     
00041   
00042     
00043     
00044     
00045     // print the first line and wait 3 sec
00046     lcd.cls();
00047 
00048     int i = 1;
00049     float meas=0;
00050     float LP=0.025;
00051     float LPT=0.0025;
00052     float temp=0;
00053     lcd.setCursorPosition(0, 0);
00054     lcd.printf("Napeti");
00055     ADC1->CR2|=ADC_CR2_TSVREFE;
00056     while(1) {
00057         meas = LP*analog_value.read()+(1-LP)*meas; // Converts and read the analog input value
00058         
00059     ADC_RegularChannelConfig(ADC1, 16, 1, ADC_SampleTime_7Cycles5);
00060     
00061    //// Temperature (in °C) = {(V25 - VSENSE) / Avg_Slope} + 25.
00062    //v25 = 1.43
00063    //avg_slope 4.3mv/c
00064 
00065     ADC_SoftwareStartConvCmd(ADC1, ENABLE); // Start conversion
00066 
00067     while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET); // Wait end of conversion
00068 
00069     temp= LPT*((V25-(float)(ADC_GetConversionValue(ADC1))*3.3/4096)/SLOPE+25)+(1-LPT)*temp; // Get conversion value
00070           
00071         
00072         if(meas > 0.5) { // If the value is greater than 1000 mV toggle the LED
00073             myled = 1;
00074         } else {
00075             myled = 0;
00076         }
00077         i++;
00078         if(i==200) {
00079             i=0;
00080             lcd.setCursorPosition(0, 0);
00081             lcd.printf("%2.2f C ", temp);
00082             lcd.setCursorPosition(1, 0);
00083             lcd.printf("%1.4f V", meas*3.3);
00084         }
00085         wait(0.001);
00086     }
00087 }