PIC16f877a coding error

[Meyou_22]

Hi, I am trying to build an automatic temperature controller with a PIC16f877a. I was able to code to enable both the heating and cooling motors to turn on for their respective conditions. However, I want to attach another "pump"motor that would activate every 30 seconds but I am confused on how to use timer0module or interrupt. Can you help code so that the "pump" can move every 30 seconds without delaying the main loop.

Code: Select all

sbit LCD_D7 at RB2_bit;
sbit LCD_D6 at RB3_bit;
sbit LCD_D5 at RB4_bit;
sbit LCD_D4 at RB5_bit;
sbit LCD_EN at RB6_bit;
sbit LCD_RS at RB7_bit;

sbit LCD_D7_Direction at TRISB2_bit;
sbit LCD_D6_Direction at TRISB3_bit;
sbit LCD_D5_Direction at TRISB4_bit;
sbit LCD_D4_Direction at TRISB5_bit;
sbit LCD_EN_Direction at TRISB6_bit;
sbit LCD_RS_Direction at TRISB7_bit;
//************************temperature variables****************
int temp,temp1,mv;
char temper[7];
//**************************************************************

void READ_temp(void)
{
temp=ADC_Read(0);
mV= (temp* 5000.0)/1024.0;
temp1=mV/10.0;
//temp=temp1*5/1023;
//temp2=temp*100;
}
void data_conversion(void)
{
inttostr(temp1,temper);
}


void display1(void)
{
lcd_out(1,1,"TEMPERATURE=");
lcd_out(1,13, Ltrim(temper));
Lcd_Chr_Cp(0xdf);
Lcd_Chr_Cp('C');
Lcd_Chr_Cp(' ');
}


 }
void main()
{
PORTD = 0;
PORTC = 0;
TRISC = 0x00;
TRISD = 0x00;
ADC_Init();
Lcd_Init(); // Initialize LCD
Lcd_Cmd(_LCD_CLEAR); // Clear display
lcd_cmd(_LCD_CURSOR_OFF);
lcd_out(1,4,"DIGITAL TEMPERATURE");
lcd_out(2,6,"SENSOR");
delay_ms(1000);
Lcd_Cmd(_LCD_CLEAR); // Clear display
PORTD=0         ;
PORTC=0;
READ_temp();
data_conversion();
display1();


  PWM2_Init(1000);  // Initialize PWM2
  PWM2_Start();  // start PWM2
  PWM1_Init(1000);  // Initialize PWM2
  PWM1_Start();  // start PWM2


while(1)
{
PORTD.B0 = temp1 >= 80 ? 1 : 0;
 if (Button(&PORTD, 0, 1000, 1)){
     PWM2_Set_Duty(200); // increment current_duty_1
    }
    {

{
 if (Button(&PORTD, 0, 1000, 1)){
     Lcd_Out(2, 1, "HOT");
     delay_ms(1000);
          Lcd_Cmd(_LCD_CLEAR);
     }

    {
PORTD.B3 = temp1 <= 65 ? 1 : 0;
 if (Button(&PORTD, 3, 1000, 1)){
     PWM1_Set_Duty(200); // increment current_duty_1
    }
    {
 if (Button(&PORTD, 3, 1000, 1)){
     Lcd_Out(2, 1, "COLD");
     delay_ms(1000);
          Lcd_Cmd(_LCD_CLEAR);
     }
READ_temp();
data_conversion();
display1();

}
}}}}     }