Diff: main.cpp

Revision:

0:ea560af47ab9

Child:

1:eb4b08eb62d6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Mar 19 05:23:48 2018 +0000
@@ -0,0 +1,113 @@
+#include "mbed.h"
+#include "DHT.h"
+#include "TextLCD.h"
+
+#define BUFFER_SIZE 3
+#define ON "on"
+#define OFF "of"
+#define LOW "lo"
+#define MEDIUM "me"
+#define HIGH "hi"
+
+TextLCD lcd(PTC2,PTA2,PTB23,PTA1,PTB9,PTC17);
+UARTSerial bluetooth(PTC15, PTC14, 38400);
+Serial pc(USBTX, USBRX);
+DHT temperature(D0, DHT11);
+PwmOut motor(PTC3); // PWM pin
+DigitalOut ON_led(D15);
+DigitalOut OFF_led(D14);
+
+int dutycycle = 15;
+int desired_temp = 76;
+
+int main(){
+    
+    //switch ON green LED and off red LED
+    OFF_led = 1;
+    ON_led = 0;
+    
+    //character array to receive BT commands
+    char command[BUFFER_SIZE];
+
+    //initialize temperature variable
+    float temp = 0.0f;
+    
+    //temperature sensor error indicator
+    int sensor_input_error = 0 ;
+    
+    //system status flag: ON or OFF
+    int on_flag = 0;
+    
+    //set the PWM period for the motor
+    motor.period(0.01);
+    
+    //make bt reading non blocking
+    bluetooth.set_blocking(false);
+    
+    while(true){       
+            
+            //Read the temperature sensor data
+            sensor_input_error = temperature.readData();
+        
+            //if no error, read temperature in Farenheit
+            if(sensor_input_error == 0){
+                temp = temperature.ReadTemperature(FARENHEIT);
+            }
+            
+            //print the serial the currently measured temperature
+            pc.printf("temperature is %2d F\n",int(temp));
+            
+            //print the temperature on the LCD
+            lcd.cls();
+            lcd.printf("Temperature is:");
+            lcd.locate(6,1);
+            lcd.printf("%2.0f F", temp);
+        
+            //compare the ambian temperature to the desired temperature
+            //when flag is on
+            if(on_flag == 1 ){
+                ON_led = 1;
+                OFF_led = 0;
+                if(temp > desired_temp){
+                    motor = (float)dutycycle/100.0;
+                }else{
+                    motor = 0;
+                }
+            //when flag is off
+            }else{
+                motor = 0;
+                ON_led = 0;
+                OFF_led = 1;
+            }
+            wait(1);
+        
+            //Poll command from bluetooth
+            bluetooth.read(command, BUFFER_SIZE);
+            
+            //compare incoming data with NULL
+            //then parse each one as a specific command
+            if(strncmp(command,"\0",3) != 0){
+                if(strncmp(command,ON,3) == 0){
+                    on_flag = 1;
+                }else if(strncmp(command,OFF,3) == 0){
+                    on_flag = 0;
+                  }else if(strncmp(command,LOW,3) == 0){
+                    dutycycle = 12;
+                    }else if(strncmp(command,MEDIUM,3) == 0){
+                        dutycycle = 15;
+                     }else if(strncmp(command,HIGH,3) == 0){
+                        dutycycle = 20;
+                    }else {
+                        sscanf(command, "%d", &desired_temp);
+                    }
+            }//end of command null compare
+         //print the command received
+         //wait(1);
+          //pc.printf("Command was : %2s \n",command);
+          //pc.printf("Duty Cycle is : %d \n",dutycycle);
+          //pc.printf("Motor flag is : %d \n", on_flag);
+          //pc.printf("Desired Temp is : %d \n", desired_temp);
+          //reset the command back to NULL
+            strcpy(command, "\0");
+    }
+}
\ No newline at end of file