ECE595_G6
Automatic Cooling system using K64F board featuring: Set desired temperature from phone app using Bluetooth DC motor based fan at three speeds to choose from: slow, medium and fast (to be selected on app) Ambient temperature measured constantly using DHT11 sensor Amibent temperature displayed on LCD LEDs to show status of the system: On or Off
Dependencies: DHT TextLCD mbed
Revision 0:ea560af47ab9, committed 2018-03-19
- Comitter:
- urvishpatel12
- Date:
- Mon Mar 19 05:23:48 2018 +0000
- Child:
- 1:eb4b08eb62d6
- Commit message:
- LCD_added
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DHT.lib Mon Mar 19 05:23:48 2018 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/Wimpie/code/DHT/#9b5b3200688f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TextLCD.lib Mon Mar 19 05:23:48 2018 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/simon/code/TextLCD/#308d188a2d3a
--- /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
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Mar 19 05:23:48 2018 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/mbed_official/code/mbed/builds/aa5281ff4a02 \ No newline at end of file