This device can be used to
remotely control the speed of an AC fan and to switch it on or off. The remote
control is a cheap NEC Format
remote, usually supplied with
small DVD players. Three buttons are used to command the circuit. The UP key
increase the fan's speed while
the DOWN key decrease it. The
ENTER key is used to switch on or off the fan. The unit provides 10 way speed
control from 0 to 9. The
current speed is displayed in a
seven segment display. The yellow LED on the PCB indicates the power status of
the load. If the load is
switched off using the R/C then
the LED will also be switched off.
The main parts of the circuit is
labeled below.
1. The seven segment display used
to show the current speed level.
2. The TSOP1738 sensor is used to
pick up commands from remote control.
3. The Yellow LED indicates the
power status of the load.
4. OUT - Here the AC load is
connected in series. Tested on 220v 50Hz AC line.
5. IN - Power supply from a
12-0-12 transformer is applied here.
6. MCU - ATmega8 AVR 8 bit
Microcontroller.
7. SWITCH - Manual Switch used to operate the unit
without the remote control.
Construction of Remote Controlled Fan Regulator.
You can make the circuit
as per the schematic on any general purpose PCB. To ease your job we are giving
the PCB Layouts too, so that you can make the PCB at your home using the Etching Method. You
may also have the PCBs made from any fabrication house too. To further easy the
job and save your money we have already made the PCBs from a good fabrication
house .
Start assembly process by first soldering the jumper1. Then you
can mount the resistors. After that solder the diodes, remember to properly
orient the diodes. They are polar and don't work if installed other way round.
Then solder the IC U4 and U2, this time too take care of the orientation. The
small round circle on the IC package marks the PIN number 1.
|
|
|
Fig.: Proper IC Installation.
|
After that you can solder the ceramic disk capacitors, the 16MHz
crystal, 7805, Triac, TSOP Sensor, Display. Finally Connect the 12-0-12
Transformer and apply power. The display should show '0'. Then you can press
the up/down key in remote control to adjust the speed. The display should
change accordingly. This ensures that the circuit is running properly.
Its time to connect a real AC load.
Connect a 220V 100W incandescent lamp (NO CFL Please). As shown in the above
wiring diagram. Replace the fan with bulb because its easier to test.
|
WARNING !!!
|
|
Never Touch any part of the
circuit when AC load is connected. It can give you a fatal shock !!!
|
Now you can can use the remote
control to increase/decrease the lamp's brightness using the remote control.
You can also switch it on and off using the ENTER key.
Troubleshooting
If the unit does not
respond to the remote control signals then look for the following.
1. AVR ATmega8's Fuse BIT is programmed to
o HIGH=0xC9 LOW=0xFF
2. AVR is clocked with 16MHz crystal (other value
won't work)
3. Remote Control is NEC Format Only (Chinese
DVD/CD player remote works good, TV Remote Generally do not work as these are
RC5 coded)
4.
Remote Key codes has
been feed to rckey.h file. Build and run this demo and press
UP,DOWN and ENTER keys to get their keycode and put them in rckeys.h file. All remotes available in market has
random key code, so This part is very important. After editing the rckeys.h
file the project must be Rebuild. (I hope you know what does that means).
5. IR sensor is of good quality and must be
labeled TSOP1738 (other values won't work).
Part list for Remote Controlled Fan Regulator.
|
Part
List
|
||
|
01
|
330 ohm resistor (9 Nos)
|
R2-R9, R14
|
|
02
|
4k7 Resistor (2 Nos)
|
R1,R11
|
|
03
|
1K Resistor
|
R12
|
|
04
|
39 ohm Resistor
|
R13
|
|
05
|
1K5 Resistor
|
R15
|
|
06
|
22pF Ceramic Disk Capacitor (2 Nos)
|
C1,C2
|
|
07
|
0.1uF Ceramic Disk Capacitor 250V(1 Nos)
|
C3
|
|
08
|
0.1uF Ceramic Disk Capacitor (2 Nos)
|
C5,C6
|
|
09
|
470uF 50v Electrolytic Capacitor
|
C4
|
|
10
|
16 MHz Crystal Half Size
|
X1
|
|
11
|
1N4007 Diode (6 Nos)
|
D2,D3,D4,D5,D6,D7
|
|
12
|
LED 5mm Any Colour
|
D1
|
|
13
|
MCT2E Opto Coupler
|
U4
|
|
14
|
MOC3021 Opto Triac Driver
|
U2
|
|
15
|
ATmega8-16PU General purpose 8 bit MCU
|
U1
|
|
16
|
Triac BT136
|
U3
|
|
17
|
7805 Voltage Regulator
|
U5
|
|
18
|
Common Anode Display
|
DISP11
|
|
19
|
TSOP1738 IR Sensor
|
X2
|
|
220V AC to 12-0-12 Center Tapped Transformer500mA minimum.
|
|
|
|
20
|
Hobby Remote Control (NEC)
|
|
#include <avr/io.h>
#include
<util/delay_basic.h>
#include
<avr/interrupt.h>
#include
"remote.h"
#include
"rckeys.h"
#define
FAN_POWER_LED_PORT PORTD
#define
FAN_POWER_LED_DDR DDRD
#define
FAN_POWER_LED_BIT 7
#define
POWER_LED_ON()
FAN_POWER_LED_PORT&=(~(1<<FAN_POWER_LED_BIT))
#define
POWER_LED_OFF() FAN_POWER_LED_PORT|=(1<<FAN_POWER_LED_BIT)
uint8_t
table[10]={141,125,109,94,78,62,47,31,16,1};
uint8_t
speed=0;
uint8_t
fan_on=0;
void Initialize()
{
FAN_POWER_LED_DDR|=0B10000000;
POWER_LED_OFF();
DDRC|=0b00111111; //Seven segment
DDRB|=0b00000010; //Middle segment G
Display(0);
RemoteInit();
//Initialize the zero crossing
detector INT(1)
MCUCR|=((1<<ISC11)|(1<<ISC10)); //INT in Rising edge
GICR|=(1<<INT1); //Enable INT1
//Output
DDRD|=(1<<PD5);
PORTD|=(1<<PD5); //High = TRIAC Off
//Set Timer 2
TCCR2|=(1<<WGM21); //CTC
TIMSK|=(1<<OCIE2); //Enable OCI2
sei();
}
/*
Zero Crossing Detect.
*/
ISR(INT1_vect)
{
if(!fan_on)
{
PORTD|=(1<<PD5); //High = TRIAC Off
return;
}
if(speed==9)
{
PORTD&=(~(1<<PD5)); //low = TRIAC ON
return;
}
PORTD|=(1<<PD5); //High = TRIAC Off
OCR2=table[speed];
TCNT2=0x00;
TCCR2|=((1<<CS22)|(1<<CS21)|(1<<CS20)); //Start Timer prescaler =1024
}
/*
Timer2 Compare ISR
*/
ISR(TIMER2_COMP_vect)
{
PORTD&=(~(1<<PD5)); //low = TRIAC ON
TCCR2&=(~((1<<CS22)|(1<<CS21)|(1<<CS20))); //Stop Timer
}
/*
Simple Wait Function
*/
void Wait()
{
char i;
for(i=0;i<100;i++)
_delay_loop_2(0);
}
/*
Displays a number in Seven Seg
Display
*/
void Display(uint8_t num)
{
if(num>9)
return;
switch (num)
{
case 0:
PORTC=0B00000000;
PORTB|=0B00000010;
break;
case 1:
// xxfedcba
PORTC=0B00111001;
PORTB|=0B00000010;
break;
case 2:
// xxfedcba
PORTC=0B00100100;
PORTB&=(~(0B00000010));
break;
case 3:
// xxfedcba
PORTC=0B00110000;
PORTB&=(~(0B00000010));
break;
break;
case 4:
// xxfedcba
PORTC=0B00011001;
PORTB&=(~(0B00000010));
break;
case 5:
// xxfedcba
PORTC=0B00010010;
PORTB&=(~(0B00000010));
break;
case 6:
// xxfedcba
PORTC=0B00000010;
PORTB&=(~(0B00000010));
break;
case 7:
// xxfedcba
PORTC=0B00111000;
PORTB|=0B00000010;
break;
case 8:
// xxfedcba
PORTC=0B00000000;
PORTB&=(~(0B00000010));
break;
case 9:
// xxfedcba
PORTC=0B00010000;
PORTB&=(~(0B00000010));
break;
}
}
void main()
{
uint8_t cmd; //Command received from remote
Initialize();
while(1)
{
//Get Command For the Remote
Control
cmd=GetRemoteCmd(1);
//Now process the command
//UP Key
if(cmd==RC_UP)
{
if(speed<9)
speed++;
}
//DOWN Key
if(cmd==RC_DOWN)
{
if(speed>0)
speed--;
}
//Enter Key
if(cmd==RC_ENTER)
{
if(fan_on)
{
POWER_LED_OFF();
fan_on=0; //Turn Off
}
else
{
POWER_LED_ON();
fan_on=1; //Turn On
}
}
Display(speed);
}
}
No comments:
Post a Comment