This document summarizes an EE-323 semester project on a home automation system. It includes sections that describe the project plan involving fan speed control using temperature sensors, indoor light control using IR sensors, outdoor light dimming using LDR sensors, and automatic and manual control modules. It provides schematics, flow charts, code explanations, and simulations for each module. The document aims to provide details on implementing a home automation system by concatenating different control modules together using a microcontroller.

1. HOME AUTOMATION
SYSTEM
EE-323 SEMESTER PROJECT

2. COURSE INSTRUCTOR:
LAB INSTRUCTOR:

3. “
”
Heights that great men reached and kept
Were not attained in sudden flight
They while their companions slept
Were toiling upwards in the night
• 2010079
• 2010105
• 2010131
• 2010279

4. FAN RPM CONTROL
THROUGH
TEMPERATURE
SENSORS
INDOOR LIGHT
CONTROL USING IR
SENSORS
OUTDOOR LIGHT
DIMMING USING
LDRs
AUTOMATIC CONTROL
MODULES
MANUAL OVERWRITE
CONTROL
C
O
N
C
A
T
I
N
A
T
I
O
N
BASIC PLAN

5. F A N R P M C O N T R O L
T H R O U G H
T E M P E R A T U R E
S E N S O R S
2010131

6. SCHEMATICS

7. LM-35
ANALOG DATA
ADC
CONVERSION
DIGITAL DATA
TEST VALUE
FLOW-CHART SUMMARIZATION

8. CODE EXPLAINATION
ADC
INTERNAL
CLOCK
TIMER
2
AN0
CCP1
-PWM
NO UNIVERSAL
VARIABLE
DECLARATIONS

9.  setup_adc_ports(AN0);
 setup_adc(ADC_CLOCK_INTERNAL);
 setup_psp(PSP_DISABLED);
 setup_spi(SPI_SS_DISABLED);
 setup_wdt(WDT_OFF);
 setup_timer_0(RTCC_INTERNAL); [SLEEP MODE]
 setup_timer_1(T1_DISABLED);
 setup_timer_2(T2_DIV_BY_16,155,1);
 setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
 setup_ccp1(CCP_PWM);
 set_pwm1_duty(0);
 setup_comparator(NC_NC_NC_NC);
 setup_vref(FALSE);
 setup_low_volt_detect(FALSE);
 set_timer2(0);
CODE EXPLAINATION

10.  while(1)
 { set_adc_channel(0);
 value=read_adc();
 if (value <= 12)
 set_pwm1_duty(0);
 else if (value > 12 && value <= 15)
 set_pwm1_duty(25);
 else if (value > 15 && value <= 18)
 set_pwm1_duty(50);
 else if (value > 18 && value <= 20)
 set_pwm1_duty(75);
 else
 set_pwm1_duty(100);}
CODE EXPLAINATION

11.  if (value <= 12)
 set_pwm1_duty(0);
CODE EXPLAINATION
VALUE <=12

12.  else if (value > 12 && value <= 15)
 set_pwm1_duty(25);
CODE EXPLAINATION
12<VALUE <=15

13.  else if (value > 15 && value <= 18)
 set_pwm1_duty(50);
CODE EXPLAINATION
15<VALUE <=18

14.  else if (value > 18 && value <= 20)
 set_pwm1_duty(75);
CODE EXPLAINATION
18<VALUE <=20

15.  else
 set_pwm1_duty(100);}
CODE EXPLAINATION
VALUE >=20

16. [SIMULATION]
PROTEUS SIMULATION OF CIRCUIT

17. I N D O O R L I G H T
C O N T R O L U S I N G
I R S E N S O R S
2010105

18. SCHEMATICS

19. FLOW-CHART SUMMARIZATION
START
INTERRUPT?
INT-IN OR INT
OUT
INT IN
CHECK OUT
FLAG
DECREMENT
PERSON
COUNTER
COUNTER=0?
OFF LIGHTS
SET LIGHTS
SET IN
INT OUT
CHECK IN
FLAG
SET OUT
INC COUNTER SET LIGHTS

20. CODE EXPLAINATION
GLOBAL
INTERRUPT
INTERRUPT
EXT1
INTERRUPT
EXT 0
short IN, OUT
int COUNT

21.  setup_adc_ports(NO_ANALOGS);
 setup_adc(ADC_OFF);
 setup_psp(PSP_DISABLED);
 setup_spi(SPI_SS_DISABLED);
 setup_wdt(WDT_OFF);
 setup_timer_0(RTCC_INTERNAL);
 setup_timer_1(T1_DISABLED);
 setup_timer_2(T2_DISABLED,0,1);
 setup_comparator(NC_NC_NC_NC);
 setup_vref(FALSE);
 enable_interrupts(INT_EXT);
 enable_interrupts(INT_EXT1);
 enable_interrupts(GLOBAL);
 setup_low_volt_detect(FALSE);
CODE EXPLAINATION

22.  void EXT_isr(void)
 {
 if (OUT)
 {COUNT -= 1;
 if (COUNT == 0)
 {output_bit( PIN_E0, 0); }
 else
 {output_bit( PIN_E0, 1); }
 OUT = 0;
 IN = 0;}
 else
 {IN = 1;}
 }
CODE EXPLAINATION
INTERRUPT
EXTERNAL_0

23.  void EXT1_isr(void)
 {
 if (IN)
 {
 COUNT+=1;
 output_bit( PIN_E0, 1);

 OUT = 0;
 IN = 0;
 }
 else
 {
 OUT = 1;
 }
 }
CODE EXPLAINATION
INTERRUPT
EXTERNAL_1

24.  void main()
 {
 IN=0;
 OUT=0;
 while(1);
 }
CODE EXPLAINATION
MAIN
PROGRAM

25. [SIMULATION]
PROTEUS SIMULATION OF CIRCUIT

26. O U T D O O R L I G H T
D I M M I N G U S I N G
L D R s
2010279

27. SCHEMATICS

28. CODE EXPLAINATION
long high_time
long low_time
int value
int lst_value
short high
short low
ADC
INTERNAL
CLOCK
TIMER
0
GLOBAL
AN0

29.  setup_adc_ports(AN0);
 setup_adc(ADC_CLOCK_INTERNAL);
 setup_psp(PSP_DISABLED);
 setup_spi(SPI_SS_DISABLED);
 setup_wdt(WDT_OFF);
 setup_timer_0(RTCC_INTERNAL);
 setup_timer_1(T1_DISABLED);
 setup_timer_2(T2_DISABLED,0,1);
 setup_comparator(NC_NC_NC_NC);
 setup_vref(FALSE);
 enable_interrupts(INT_TIMER0);
 enable_interrupts(GLOBAL); set_timer0(0);
 lst_value = 0;
CODE EXPLAINATION

30. CODE EXPLAINATION
FUNCTION
ZERO DUTY
 void zero_duty()
 { output_low(PIN_C0);
 disable_interrupts(INT_TIMER0);
 }

31. CODE EXPLAINATION
FUNCTION
FULL DUTY
 void full_duty()
 {
 output_high(PIN_C0);
 disable_interrupts(INT_TIMER0);
 }

32. CODE EXPLAINATION
FUNCTION
X DUTY
(25% / 75%)
 void x_duty(int pcnt_duty)
 {
 if (pcnt_duty == 25)
 {
 high_time = 0x0271;
 low_time = 0xFD8E;
 }
 else
 {
 high_time = 0xFD8E;
 low_time = 0x271;
 }
 output_high(PIN_C0);
 set_timer0(high_time);
 high = 1;
 low = 0;}

33. CODE EXPLAINATION
TIMER-0
INTERRUPT
 #int_TIMER0
 void TIMER0_isr(void)
 {
 if (high)
 {
 set_timer0(low_time);
 output_low(PIN_C0);
 high = 0;
 low = 1;
 }
 else
 {
 set_timer0(high_time);
 output_high(PIN_C0);
 high = 1;
 low = 0; }}

34. CODE EXPLAINATION
MAIN
PROGRAM
 while(1)
 { set_adc_channel(0);
 value=read_adc();
 if(value != lst_value)
 { lst_value = value;
 if (value <= 20)
 full_duty();
 else if (value > 20 && value <= 60)
 {enable_interrupts(INT_TIMER0);
 x_duty(75); }

 else if (value > 60 && value < 142)
 { enable_interrupts(INT_TIMER0);
 x_duty(25); }
 else
 zero_duty();}}

35. [SIMULATION]
PROTEUS SIMULATION OF CIRCUIT

36. M A N U A L
O V E R WR I T E
C O N T R O L
2010079

37. FLOW-CHART SUMMARIZATION

38.  EXTERNAL 0 - MODE SWITCHING
 EXTERNAL 1 - IR SENSORS (IN)
 EXTERNAL 2 - IR SENSORS (OUT)
CODE EXPLAINATION
AUTO/MANUAL MODE SWITCHING
INTERRUPT

39. CODE EXPLAINATION
Flag bit= high
Manual
Mode
Disable
interrupts
Flag bit= low Auto Mode
Enable
interrupts
 EXTERNAL 0 - MODE SWITCHING
 A bit is initialized with the value 0 (auto
mode), every time the interrupt EXT_0
occurs, the value of the bit is toggled.

40. C O N C A T I N A T I O
N O F T H E
M O D U L E S
2010079

41. FLOW-CHART SUMMARIZATION
START
AUTO MODE
MAIN
ENABLE INTERRUPTS
TEMP SENSOR
FUNCTION
DIMMER FUNCTION
RETURN TO MAIN

42. FLOW-CHART SUMMARIZATION
EXT 0
SWITCH
MODE
AUTO TO
MANUAL
DISABLE EXT
INTERRUPTS
MANUAL
TO AUTO
ENABLE EXT
INTERRUPTS

43. T H E E N D !