I want to interface following relay board to PIC controller This relay become active on low logic


The relay is active low If I connect any input IN1, IN2, IN2 and IN3 pin to ground relay would be activated so How to connect this board with microcontrolle

#include <xc.h>
#define _XTAL_FREQ 20000000 //Specify the XTAL crystall FREQ
#define  Sensor      RC0
#define  Fan         RB2
#define  ON           1
#define  Off          0
#define  High         1
void main(void)
{
    TRISB=0X00; //PORTB pins are used as Output.
    TRISC=0Xff; //PORTB pins are used as Input.
    PORTB=0X00; //Make all output of RB3 LOW
while(1)
{
    if(Sensor ==High)
    {
        Fan = ON;
        __delay_ms(1000);
    }
    else
    {
        Sensor = Off;
    }
    return;
}
}

I have written this program and it's working I have tested it with led but not working with relay because need to send 0 to relay

How to send 0 to relay ?

 

To cope with the active low instead of active high you invert the output signals.
Line 12: PORTB=0xFF;
Line 17: Fan = Off;

 

Did you check to see if there is an option of connecting the input as Active Hi or Active Low?
Usually when the input shows both +5 and GND the option is to sink or source.
Max.

 

To cope with the active low instead of active high you invert the output signals.
Line 12: PORTB=0xFF;
Line 17: Fan = Off;

Perhaps the following code may be work

#define _XTAL_FREQ 20000000 //Specify the XTAL crystal FREQ
#include <xc.h>

#define  Sensor      RC0
#define  Fan         RB2
#define  ON           1
#define  Off          1
#define  High         0
void main(void)
{
    TRISB1 = 1; //PORTB pins are used as Output.
    TRISC=0Xff; //PORTB pins are used as Input.
    PORTB=0X00; //Make all output of RB3 LOW
while(1)
{
    if(Sensor ==High)
    {
        Fan = ON;
        __delay_ms(1000);
    }
    else
    {
        Sensor = Off;
    }
  
}
}

I haven't tested code because I am outside from home

 

Did you check to see if there is an option of connecting the input as Active Hi or Active Low?
Usually when the input shows both +5 and GND the option is to sink or source.
Max.

I don't see the option, there is a jumper on the board but when I removed and test it with high active relay doesn't isolate