/*#############################################################

Program Name    : ex1_DHT11_measure
Author          : Grant Phillips
Date Modified   : 2/05/2016
Compiler        : ARMmbed
Tested On       : STM32F4-Discovery

Description     : Example program that demonstrates the use of
                  a DHT11 Humidity-Temperature Sensor. It is 
                  recommended not to initiate a read() quicker
                  than every 200ms, otherwise the DHT11 will
                  respond with an error. 
                  
                  The output is displayed on a PC using the
                  Serial Wire Viewer (SWV).  See the SWV examples
                  for an explanation of the use of this feature. 

Requirements    : * STM32F4-Discovery Board
              
Circuit         : * The DHT11 sensor connected as:
                    1. VCC          -       3V
                    2. DATA         -       PE15    (with a 5K6 pull-up 
                                                     resistor to 3V; pin is 5V tolerant)
                    3. NC           -       Not connected
                    4. GND          -       GND
                  * A wire link between PB3 and pin6 of the SWD
                    connector (CN2) as explained in the SWV
                    examples section

##############################################################*/

#include "mbed.h"
#include "SWO.h" 
#include "Dht11.h"   //Eric Fossum's class library (Feb 2015)

SWO_Channel SWO;

Dht11 dht(PE_15);    //Create a Dht11 object with DATA on PE_15 (must be DigitalInOut compatible pin)

int main() {
    int hum, tempc;
    float tempf;
    
    while(1){
        if(dht.read() == 0) {                        //initiate a read from the DHT11 sensor and check if the result is OK ( = 0)
            //get the values if result is OK   
            hum = dht.getHumidity();     
            tempc = dht.getCelsius();
            tempf = dht.getFahrenheit();
            //display the values                     
            SWO.printf("Humidity = %d   Temp (Celsius) = %d   Temp (Fahrenheit) = %.1f\n", hum, tempc, tempf);  
        }
        else {
            SWO.printf("Error!\n");
        }
        wait(0.5);
    }
}