Bhakti Kulkarni
/
IOT_HW_6_THREADS
Important changes to repositories hosted on mbed.com
Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.
To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.
It is also possible to export all your personal repositories from the account settings page.
Dependencies: C12832_lcd LM75B MMA7660 NTPClient WiflyInterface HOMEWORK_6 mbed
Revision 0:ec9669ff706c, committed 2014-06-09
- Comitter:
- bhakti08
- Date:
- Mon Jun 09 21:12:22 2014 +0000
- Commit message:
- Homework 6
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/C12832_lcd.lib Mon Jun 09 21:12:22 2014 +0000 @@ -0,0 +1,1 @@ +https://mbed.org/users/dreschpe/code/C12832_lcd/#c9afe58d786a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/LM75B.lib Mon Jun 09 21:12:22 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/chris/code/LM75B/#6a70c9303bbe
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MMA7660.lib Mon Jun 09 21:12:22 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/Sissors/code/MMA7660/#a8e20db7901e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/NTPClient.lib Mon Jun 09 21:12:22 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/donatien/code/NTPClient/#881559865a93
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/WiflyInterface.lib Mon Jun 09 21:12:22 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/teams/mbed/code/WiflyInterface/#a27cf731e79a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon Jun 09 21:12:22 2014 +0000
@@ -0,0 +1,244 @@
+/****************************************************************************************/
+/* INTERNET OF THINGS ASSIGNMENT 6 */
+/*This assignment implements a thermostat which turns ON/OFF depending on the set and */
+/*current temperature. The thermostat can be turned ON/OFF by following ways: */
+/* 1. Joustick up button on the application board. */
+/* 2. Depending on if there is movement or not */
+/* 3. Remotely through wifly(Telnet) */
+/****************************************************************************************/
+
+#include "mbed.h"
+#include "rtos.h"
+#include "C12832_lcd.h"
+#include "NTPClient.h"
+#include "WiflyInterface.h"
+#include "LM75B.h"
+#include "DebouncedIn.h"
+#include "MMA7660.h"
+
+#define SEC 1000 //macro for no. of msec in sec
+#define MIN 60*SEC //macro for no. of msec in min
+#define hys 3
+#define TIME 20 //Time after which system should turn OFF if
+ //no movement detected
+#define ECHO_SERVER_PORT 7 //Server port for HTTP client.
+
+Mutex LCD;
+C12832_LCD lcd;
+Serial pc (USBTX,USBRX);
+LM75B current(p28,p27);
+MMA7660 MMA(p28,p27);
+BusOut move(p23,p24,p25);
+
+//System ON/OFF
+BusIn heat_on (p16,p13);
+
+//Increase Temperature
+DebouncedIn temp_up (p15);
+
+//Decrease Temperature
+DebouncedIn temp_down (p12);
+
+//System ON/OFF LED
+DigitalOut thermostat (LED1);
+
+//Heater ON/OFF LED. This can be furthur connected to the relay
+DigitalOut heater (LED2);
+
+
+int temp = 10;
+bool status = 0;
+
+void update_lcd(void const *args); //Thread 1
+void Thermostat_logic (void const *args); //Thread 2
+void check_movement(void const *args); //Thread 3
+
+bool no_move;
+float acc_x = MMA.x();
+float acc_y = MMA.y();
+float acc_z = MMA.z();
+float acc_x_old,acc_y_old,acc_z_old;
+bool wifly_on = 0;
+
+WiflyInterface wifly(p9, p10, p30, p29, "MY_WIFI", "", NONE);
+
+/****************************************************************************************/
+/*Thread update_lcd: This thread is used to update the lcd. The LCD will dispaly current*/
+/*time, Set temperature and the actual temperature. If the system is OFF lcd will show */
+/*current time and message 'System OFF' */
+/****************************************************************************************/
+void update_lcd(void const *args)
+{
+ set_time(1391739990);
+ while (true) {
+ time_t seconds = time(NULL);
+ LCD.lock();
+ lcd.locate(0,0);
+ lcd.printf("%s",ctime(&seconds));
+ lcd.locate(0,10);
+ if (status) {
+ lcd.printf("Current: %.2f",current.read());
+ lcd.locate(1,20);
+ lcd.printf("Set: %d",temp);
+ } else {
+ lcd.printf("System OFF");
+ }
+ LCD.unlock();
+ Thread::wait(200); //LCD will update after every 200msec.
+ }
+}
+/****************************************************************************************/
+
+/****************************************************************************************/
+/*Thread: thermostat logic: This thread implements the logic of the thermostat. It turns*/
+/*ON/OFF the thermostat depending on temperature, movement and the web control. It also */
+/*allows the user to set the temperature from the push button switches. The setting of */
+/*temperature can also be done remotely through xively. Currently the program just */
+/*controls turning ON/OFF the system remotely. */
+/****************************************************************************************/
+void Thermostat_logic(void const *args)
+{
+ while (true) {
+ if (heat_on == 0x2 || wifly_on || !no_move)
+ {
+ thermostat = 1;
+ status = 1;
+ wifly_on = 1;
+ } else if ( wifly_on == 0 ){
+ thermostat = 0;
+ heater = 0;
+ status = 0;
+ wifly_on = 0;
+ }
+ else if (heat_on == 0x1 || no_move ) {
+ thermostat = 0;
+ heater = 0;
+ status = 0;
+ wifly_on = 0;
+ }
+
+ /*If the joystick is pushed upwards increase set temperature by 2
+ And print the set temperature on LCD.*/
+ if (temp_up.rising()) {
+ temp = temp + 0x2;
+ }
+
+ /*else if the joystick is pushed downwards decrease set temperature by 2
+ And print the set temperature on LCD.*/
+
+ else if (temp_down.rising()) {
+ temp = temp - 0x2;
+ }
+
+ //Comparison logic and turn Heater ON/OFF
+ if ((temp > (current.read()+ hys)) && thermostat == 1)
+ heater = 1;
+ else if ((temp < (current.read()- hys)) || thermostat == 0)
+ heater = 0;
+
+ if (acc_x_old != MMA.x() || acc_y_old != MMA.y() || acc_z_old != MMA.x())
+ {
+ no_move = 0;
+ }
+
+ Thread::wait(100); //Temperature comparison will take place after
+ //every 100msec.
+ }
+}
+/****************************************************************************************/
+
+
+/****************************************************************************************/
+/*Thread check movement: This thread detects if there is movement nearby the thermostat.*/
+/*If there is no movement this thread sets a variable called no_move which is furthur */
+/*used to turn ON/OFF the system. Logic implemented for movement detection is as follows*/
+/*This thread is executed once every minute. Every time this thread is executed it */
+/*compares the accelerometer reading with its previous value. If the reading is same */
+/*(no movement detected) it increments a counter. When this counter reaches 20 (which */
+/*means there is no movement for 20 mins) it sets the variable no_move to turn OFF the */
+/*system. When a different accelerometer value is detected(movement present) it resets */
+/*the variable which will in turn turn the system ON. */
+/****************************************************************************************/
+void check_movement(void const *args)
+{
+ static int move_cntr = 0;
+ while (true) {
+ acc_x_old = acc_x;
+ acc_y_old = acc_y;
+ acc_z_old = acc_z;
+ acc_x = MMA.x();
+ acc_y = MMA.y();
+ acc_z = MMA.z();
+ if (acc_x_old == acc_x && acc_y_old == acc_y && acc_z_old == acc_z)
+ {
+ move_cntr++;
+ pc.printf("Value of move_cntr = %d\r\n",move_cntr);
+ move = 011;
+ }
+ else {
+ move_cntr = 0;
+ pc.printf("Move_cntr reset\r\n");}
+ if (move_cntr >= TIME) //If the Accelerometer value remains constant for 20 mins no movement detected
+ no_move = 1;
+ else
+ no_move = 0;
+ Thread::wait(1*MIN);
+ }
+
+}
+/****************************************************************************************/
+
+
+/****************************************************************************************/
+/*Thread main: This is the main thread which instantiates all other threads. The main */
+/*thread also initializes the wifly module and communicates with the mbed via wifly. */
+/*If the HTTP client is not connected, the main thread continues its operation through */
+/*the on board joystick. Turning ON/OFF the thermostat remotely is not possible in such */
+/*a case. The other controls like the joystick and the accelorometer operate normally. */
+/****************************************************************************************/
+int main() {
+
+ Thread lcd_display(update_lcd,NULL, osPriorityAboveNormal);
+ Thread thermostat_thread(Thermostat_logic,NULL, osPriorityAboveNormal);
+ Thread accel_thread(check_movement,NULL,osPriorityAboveNormal);
+
+ wifly.init(); //Use DHCP
+ while (!wifly.connect());
+ pc.printf("IP Address is %s\n\r", wifly.getIPAddress());
+
+ TCPSocketServer server;
+
+ server.bind(ECHO_SERVER_PORT);
+ server.listen();
+
+ printf("\nWait for new connection...\r\n");
+ TCPSocketConnection client;
+ server.accept(client);
+ char buffer[3];
+ // NTPClient ntp;
+ //ntp.setTime("nist1.symmetricom.com");
+
+ while (true) {
+ if (client.is_connected()){
+ int n = client.receive(buffer, sizeof(buffer));
+ if (n <= 0)continue;
+ buffer[n] = 0;
+ pc.printf("Buffer is %s\r\n",buffer);
+ if (!(strcmp(buffer,"o")))
+ wifly_on = 1;
+ else if (!(strcmp(buffer,"f"))){
+ wifly_on = 0;
+ pc.printf("wifi off\r\n");
+ }
+ Thread::wait(100);
+ client.send_all(buffer,n);
+ pc.printf("Sent data is %s\r\n",buffer);
+ }
+ else
+ Thread::wait(1*SEC);
+ Thread::wait(100); //This wait is necessary for the condition in which http
+ //client is connected but it does not receive anything.
+ //if n<= 0
+ }
+}
+/****************************************************************************************/
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-rtos.lib Mon Jun 09 21:12:22 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/bhakti08/code/HOMEWORK_6/#4309b1a91247
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Jun 09 21:12:22 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/0b3ab51c8877 \ No newline at end of file