Ceiling Fan Digital Speed Control using MCU

haxan said:

Its a simple AC motor which runs on 220V in one direction. Its not like drill machine motor.

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haxan said:

But it says "it's sutable For Lamp Dimming OR Fan Speed Controlling".

Do you think there is no way to control speed of fan digitally?

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haxan said:

I have done that. I broke the Fan dimmer which was already installed in my wall. It contains "z0409mf" which is a Triac from ST. Then there is a "ST DB3 C148", i think its a DIAC maybe.

Then there is a 683J in silver packing with two legs. A variable rotator and a resistance of 4.1K ohms.

Does this make any sense? I believe the Triac means that it can be phased control correct?

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#include <p18cxxx.h>
#include <delays.h>
#include <timers.h>
#include <pwm.h>

#pragma config WDT = OFF

/*function prototypes, reproduced from Header Files for information
void OpenPWM1 (char);
void OpenPWM2 (char);
void OpenTimer2 (unsigned char);
void Delay10KTCYx (unsigned char);
*/

unsigned int dimmer1 = 0;
unsigned int dimmer2 = 0;
unsigned int dutycycle1 = 0;
unsigned int dutycycle2 = 0;

void main (void)
{
ADCON1 = 0b00000110; //Set Port A for digital i/o
TRISA = 0x00;
TRISB = 0xF0;
TRISC = 0xF0;
PORTA = 0;
PORTB = 0;
PORTC = 0;

OpenTimer2 (TIMER_INT_OFF & T2_PS_1_16 & T2_POST_1_1);
OpenPWM1 (0xFF); //Enable PWM1 and set period
OpenPWM2 (0xFF); //Enable PWM2 and set period

while (1)
{
dimmer1 = PORTC & 0xF0;
dimmer2 = PORTB & 0xF0;
dimmer1 = dimmer1 >> 4;
dimmer2 = dimmer2 >> 4;
if(dimmer1 > 0 && dimmer1 < 11)
{
dutycycle1 = dimmer1 * 100; // Scaling out (Max 1000)
}
else
{
dutycycle1 = 0;
}

if(dimmer2 > 0 && dimmer2 < 11)
{
dutycycle2 = dimmer2 * 100; // Scaling out (Max 1000)
}
else
{
dutycycle2 = 0;
}

SetDCPWM1 (dutycycle1);
SetDCPWM2 (dutycycle2);
}
}

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