main.cpp

00001 #include "mbed.h"
00002 #include "freetronicsLCDShield.h"
00003 #include "DHT.h"
00004 
00005 freetronicsLCDShield lcd(D8, D9, D4, D5, D6, D7, D3, A0);
00006 DHT sensor(A5, DHT11);
00007 DigitalOut myled(LED1);
00008 Ticker flipper;
00009 bool up=true;
00010 void readBP()
00011 {
00012     float bp=lcd.readButton();
00013     if (bp<0.25)
00014         up=true;
00015     else if (bp<0.5)
00016         up=false;
00017 }
00018 int main()
00019 {
00020     flipper.attach(&readBP, 0.1);
00021     int error = 0;
00022     float h = 0.0f, c = 0.0f, f = 0.0f, k = 0.0f, dp = 0.0f, dpf = 0.0f;
00023     // turn on the back light (it's off by default)
00024     lcd.setBackLight(true);
00025     lcd.cls();
00026     // print the first line and wait 3 sec
00027     lcd.printf("mbed DHT11");
00028     wait(3);
00029 
00030     // print the counter prefix; the number will be printed in the while loop
00031 
00032 
00033 
00034 
00035     while (1) {
00036 
00037         error = sensor.readData();
00038         if (0 == error) {
00039             c   = sensor.ReadTemperature(CELCIUS);
00040             f   = sensor.ReadTemperature(FARENHEIT);
00041             k   = sensor.ReadTemperature(KELVIN);
00042             h   = sensor.ReadHumidity();
00043             dp  = sensor.CalcdewPoint(c, h);
00044             dpf = sensor.CalcdewPointFast(c, h);
00045             if(up==true) {
00046                 lcd.setCursorPosition(0, 0);
00047                 lcd.printf("Temperature %4.2f   ",c);
00048                 lcd.setCursorPosition(1, 0);
00049                 lcd.printf("Humidity %4.2f   ", h);
00050             }
00051             if(up==false) {
00052 
00053                 lcd.setCursorPosition(0, 0);
00054                 lcd.printf("Humidity %4.2f   ", h);
00055                 lcd.setCursorPosition(1, 0);
00056                 lcd.printf("Dew point %4.2f  ",dp);
00057             }
00058         } else {
00059 
00060             lcd.setCursorPosition(0, 0);
00061             lcd.printf("mbed DHT11     ");
00062             lcd.setCursorPosition(1, 0);
00063             lcd.printf("Error: %d      ", error);
00064         }
00065 
00066 
00067         wait(0.5f);
00068     }
00069 }