hi i need some help in implementing LED and push button

[Hashwanth]

hi i’m very new to controller and i’m trying myself with pic16f877A. here is my doubt, when i deal with push button and LED, i have some trouble in switching my LED’s off, i need to on and off the LED by using same button,here is my code.

 

can anyone please help me solve this issue,,

 

void lcd_cmd(char a);

void lcd_disp(char b);

 

void main()

{

char a[]={“LED1 ON led2off”};

char a1[]={“LED3 OFF”};

char b[]=”LED1OFF LED2ON”;

char c[]=”LED1OFF LED2OFF”;

char d[]=”LED3 ON”;

int i;

char x;

 

   setup_adc_ports(NO_ANALOGS);

   setup_adc(ADC_OFF);

   setup_psp(PSP_DISABLED);

   setup_spi(FALSE);

   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);

   setup_timer_1(T1_DISABLED);

   setup_timer_2(T2_DISABLED,0,1);

   setup_comparator(NC_NC_NC_NC);

   setup_vref(FALSE);

 

   // TODO: USER CODE!!

 lcd_cmd(0x01);

 lcd_cmd(0x06);

 lcd_cmd(0x0e);

 lcd_cmd(0x38);

 

while(1)

{

lcd_cmd(0x80);

switch(1)

{

 

case 1:  if(input(pin_c0)==0)

{

output_low(pin_d7);

delay_ms(10);

lcd_cmd(0x01);

delay_ms(10);

for(i=0;a!=’’;i++)

{

x=a;

lcd_disp(x);

delay_ms(10);

}

lcd_cmd(0xc0);

for(i=0;a1!=’’;i++)

{

x=a1;

lcd_disp(x);

delay_ms(10);

}

while(input(pin_c0)==0);

 

}

 

 

 

 

case 2: if(input(pin_c1)==0)

{

output_low(pin_d6);

delay_ms(10);

lcd_cmd(0x01);

delay_ms(10);

for(i=0;b!=’’;i++)

{

x=b;

lcd_disp(x);

delay_ms(10);

}

lcd_cmd(0xc0);

for(i=0;a1!=’’;i++)

{

x=a1;

lcd_disp(x);

delay_ms(10);

}

while(input(pin_c1)==0);

}

 

case 3: if(input(pin_c2)==0)

{

output_low(pin_d5);

delay_ms(10);

lcd_cmd(0x01);

delay_ms(10);

for(i=0;c!=’’;i++)

{

x=c;

lcd_disp(x);

delay_ms(10);

}

lcd_cmd(0xc0);

for(i=0;d!=’’;i++)

{

x=d;

lcd_disp(x);

delay_ms(10);

}

while(input(pin_c2)==0);

}

 

 

}

}

}

 

 void lcd_cmd(char a)

{

output_low(pin_d1);

output_low(pin_d0);

output_b(a);

output_high(pin_d1);

delay_ms(10);

output_low(pin_d1);

}

 

void lcd_disp(char b)

{

output_low(pin_d1);

output_high(pin_d0);

output_b(b);

output_high(pin_d1);

delay_ms(10);

output_low(pin_d1);

}

[SAAD ABDULLAH]

As mentioned in your code 

*

switch(1)

{

*

 

which variable are u using in switch case? it only mentions a constant  integer.

[AJISH ALFRED]

Hi Hashwanth,

 

I read that “hi i’m very new to controller“

 So i would suggest you not to make the code this much complex. Write a seperate small code for interfacing the switch and led only and test it.

[Ashutosh Bhatt]

you said you want just a switch and LED

and in your program I see LCD, ADC

why do you need these?

i suggest you start with the tutorials given on this site

EG labs / micro controller / PIC

[Hashwanth]

Hi all,

 

  Thanks for your reply, i have completed that coding without using switch case and this looks much complex than the one which i posted earlier. And i have to go with some tutorials first so that i can handle this like situations. 

[Author]

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