ORYON TECHNOLOGY
www.oryontech.in
AUTOMATIC ROOM TEMPERATURE CONTROLLER
This is a smart room temperature control system. It controls your room
temperature using a fan and a room heater. Atmega16 micro-controller is the
heart of this system. 16x2 LCD display used to display information about your
room temperature. You can adjust your room temperature between 15 degree to
55 degree celcius. There are 4 temperature sensor used to sense room
temperature accurately. If temperature is lower than defined temperature then
system switched ON room heater. If temperature is higher than defined
temperature then system switched ON fan. If temperature is equals to set
temperature than room heater and fan both OFF.
ADVANTAGE:
 It manages automatically temperature of the room.
 Less expensive then air-conditioned.
 It reduces electric power consumption.
 Easily install at any place.
DISADVANTAGE:
 It require additional electrical power for working
 It consumes more space than the traditional fan regulator.
APPLICATIONS:
 It can used in offices, class rooms, kitchens, living rooms, bed rooms etc.
 It manages temperature in tunnels and mines.
Automatic room temperature controller..
ORYON TECHNOLOGY
Automatic room temperature controller..
www.oryontech.in
ORYON TECHNOLOGY
Automatic room temperature controller..
www.oryontech.in
ORYON TECHNOLOGY
Automatic room temperature controller..
www.oryontech.in
ORYON TECHNOLOGY
www.oryontech.in
CIRCUIT DESCIPTION:
A 12-0-12/0.5 AMP TRANSFORMER use for converting 230V ac into 12V ac. We
used two diodes (D1, D2) for converting 12V AC into 12V pulsating DC then we
use capacitor C1 (1000uF) for filtering DC power supply. 7805 regulator convert
12V DC to 5V DC for microcontroller and LCD because both works on 5V DC
supply.C2 filter the 5V supply after regulation.
Pin 1 of all LM 35 is connected to 5V DC, Pin 3 of all LM 35 is connected with
GROUND and P2 of all LM 35 is connected with Pin 40,39,38,37 of
microcontroller.
UP switch and DOWN switch connected with Pin1 and 2 of microcontroller.R13
and R14 connected with both UP, DOWN switch and with the circuit ground.
LCD1 is a 16x2 LCD which connected with Pin 14, 15, 16, 17, 18, 19 of MCU.R1
connected with Pin3 of LCD and ground.LCD Pin 2 connect with +5 volt and Pin 1
Connect with ground. Pin 22 of MCU use for control ROOM HEATER and Pin 23,
24, 25, 26, 27 of MCU use for control of FAN REGULATOR. Pin 32 and 30 connect
with +5 volt. Resistor R2, R4, R6, R8, R10 and R12 connect with base of transistor
Q1, Q2, Q3, Q4, Q5, Q6 for controlling current on the base of transistors. LED D1,
D4, D6, D8, D10, D12 indicates status of relays which ON/OFF. Resistors
R1,R3,R5,R7,R9,R11 use for controlling current of LED’s which shows status of
RELAYs. Diodes D1, D3, D5, D7, D9, D11 use as the free-wheeling diodes. Relay 1
use for control ROOM HEATER and RELAY 2, 3, 4, 5, 6 use for controlling speed of
FAN, they connected with fan regulator resistor for increasing and decreasing AC
current for FAN.
Automatic room temperature controller..
ORYON TECHNOLOGY
www.oryontech.in
WORKING:
We use four temperature sensors (LM 35) for measuring room temperature.
Microcontroller read analog data from these sensors through their ADC pins then
converts into digital data.
Microcontroller calculates Average temperature or room temperature by using
this formula.
Average temperature = (T1 + T2 + T3 + T4) / 4
Room temperature = average temperature
T1, T2, T3, T4 are the temperature sensed by all four temperature sensors.
Room temperature is equal to average temperature and shows in LCD’s first line
as “Room Temp”. Switch UP and DOWN is use for set reference temperature of
the room that we want. The reference temperature shows in LCD’s second line as
“Set temp”.
Microcontroller continuously compare room temperature and set temperature.
If room temperature is smaller than set temperature then microcontroller
automatically ON the room heater.
If room temperature is greater than the set temperature then microcontroller
automatically ON the FAN and regulate the FAN speed according to the
difference between set temperature and room temperature.
If room temperature is equals to the set temperature then both FAN and ROOM
HEATER become OFF.
Automatic room temperature controller..
ORYON TECHNOLOGY
www.oryontech.in
COMPONENTS USED:
S.NO
COMPONENTS
QUANTITIES
1.
LM 35
4
2.
ATMEGA16
1
3.
16X2 LCD
1
4.
PUSH SWITCH
2
5.
DIODES(1N4007)
8
6.
ON/OFF SWITCH
1
7.
CAPACITOR 1000uF
1
8.
CAPACITOR 1Uf
1
9.
REGULATOR(LM7805)
1
10.
TRANSISTORS(BC548)
6
11.
RELAYS(12V)
6
12.
LED’S
6
13.
RESISTORS(10K)
2
14.
RESISTORS(1K)
7
15.
RESISTORS(4.7K)
6
16.
FAN REGULATOR RESISTOR COIL
1
17.
TEANSFORMER(12-0-12)
1
18.
GENERAL BOARD,WIRES,BULBS
POWER CHORD ETC.
Automatic room temperature controller..
ORYON TECHNOLOGY
www.oryontech.in
We are manufacturing electronics , mechanical and robotics projects for diploma,
B.tech, M.tech and Phd students.
We are also make electronic , mechanical and robotics kits and devices as per user
requirement.
Contact – 9457815918,9457656002,oryon.tech@gmail.com,www.oryontech.in
Automatic room temperature controller..