adc configuration and conditional statement using micro c

glenndingding · Feb 23, 2012

hi everyone,

i am using MICRO C for my PIC16f877a micro controller but i have a problem encountered regarding the adc configuration and and making conditions in comparing constants.

i have 3 inputs which in need to be read in adc.....

1st input ...the adc read it. then it compares to a constant value of 12. then it gives 2 outputs. first output is switch relay and second output led blink.
2nd input ...the adc read it. then it compares to a constant value of 16. then it gives 2 outputs. first output is switch relay and second output led blink.
3rd input ...the adc read it. then it compares to a constant value of 24. then it gives 2 outputs. first output is switch relay and second output led blink.

here is my code .....please help me to correct..

Code C - [expand]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
void ADCInit(){         //configuring adc module
}
unsigned int ADCRead(){
 
ADCON1 = 0xFF;          //configuring AN0-AN7 as analog inputs and  VREF
ADCON0   = 0x07;        //configuring  analog channels  AN0, AN1, AN2
ADON_BIT     = 1;       //switch on adc module
GO_DONE_BIT   =1 ;      //start conversion
 
while(GO_DONE_BIT);      //wait for the condition to finish
ADON_BIT= 0;            //switch off adc
}
 
void main(){
 
ADCInit();                 //initializes adc in the main program
 
TRISB = 0x00;
PORTB = 0x00;              //putting port B as output   for LED indicator
TRISD = 0X00;
PORTD = 0x00;              //putting port D as output for relay switching
 
 
while(1){
unsigned int sensor1_15A;   //assigning variable for input1
unsigned int sensor2_20A;   //assigning variable for input2
unsigned int sensor3_30A;   //assigning variable for input3
 
unsigned int reading1;      //assigning variable for adc reading1 for input1
unsigned int reading2;      //assigning variable for adc reading2 for input2
unsigned int reading3;      //assigning variable for adc reading3 for input3
 
reading1 = sensor1_15A-511*0.012207;    //assigning variables with constants
reading2 = sensor2_20A-511*0.012207;    //assigning variables with constants
reading3 = sensor3_30A-511*0.012207;    //assigning variables with constants
 
 
sensor1_15A = ADCRead(1);      //the adc reading of input 1 will be placed in the first variable sensor1_15A
sensor2_20A = ADCRead(2);      //the adc reading of input 2 will be placed in the first variable sensor2_20A
sensor3_30A = ADCRead(3);      //the adc reading of input 3 will be placed in the first variable sensor3_30A
 
 
while(1){
    if (reading1>12){       // condition when the (adc reading-511*0.012207) is greater to the set value of 12 amperes
                            //adc reading-511*0.012207 = amperes.......
        PORTD.6 = 0xFF;      //port D is used fOr switching relay1  at RD6 at pin 29 of PIC16f877a is set to input for relay switching
                                     // I do not know if it is PORTD.6..  i consider RD0, RD1, RD2, RD3, RD4, RD5,RD6, RD7 = pin 0,1,2,3,4,5,6,7
        PORTD.6 = 0x00;
        delay_ms(5000);     //port D at at RD6 at pin 29 of PIC16f877a is set to output for relay switching
 
        PORTB.7 = 0x00;      //PORT B AT rb7 at pin 40 of pic16f877a is set to output for led blinking
        delay_ms(1000);
        PORTB.7 = 0xFF;      //PORT B AT rb7 at pin 40 of pic16f877a is set to input for led blinking
        delay_ms(1000);
    else
        PORTD.6 = 0xFF;      //PORT D AT  RD6 is nothing to do
        PORTB.6 = 0x00;      //PORT B AT rb6 at pin 39 of pic16f877a is set to output for led steady light
    }
 
    if (reading2>16){          // condition when the (adc reading-511*0.012207) is greater to the set value of 16 amperes
                                    //adc reading-511*0.012207 = amperes.......
        PORTD.5 = 0xFF;     //port D is used fpr switching relay2  at RD5 at pin 28 of PIC16f877a is set to input for relay switching
                                     // I do not know if it is PORTD.5..  i consider RD0, RD1, RD2, RD3, RD4, RD5,RD6, RD7 = pin 0,1,2,3,4,5,6,7
        delay_ms(5000);
        PORTD.5 = 0x00;
        delay_ms(5000);
        
        PORTB.5 = 0x00;      //PORT B AT rb5 at pin 38 of pic16f877a is set to output for led blinking
        delay_ms(1000);
        PORTB.5 = 0xFF;     //PORT B AT rb5 at pin 38 of pic16f877a is set to input for led blinking
        delay_ms(1000);
    else
        PORTD.5 = 0xFF;      //PORT D AT  RD5 is nothing to do
        PORTB.4 = 0x00;     //PORT B AT rb4 at pin 37 of pic16f877a is set to output for led steady light
    }
 
    if (reading3>24){            // condition when the (adc reading-511*0.012207) is greater to the set value of 16 amperes
                                    //adc reading-511*0.012207 = amperes.......
        PORTD.4 = 0xFF;     //port D is used fpr switching relay3  at RD4 at pin 28 of PIC16f877a is set to input for relay switching
                                     // I do not know if it is PORTD.5..  i consider RD0, RD1, RD2, RD3, RD4, RD5,RD6, RD7 = pin 0,1,2,3,4,5,6,7
        delay_ms(5000);
        PORTD.4 = 0X00;
        delay_ms(5000);
        
        PORTB.3 = 0x00;       //PORT B AT rb3 at pin 36 of pic16f877a is set to output for led blinking
        delay_ms(1000);
        PORTB.3 = 0xFF;      //PORT B AT rb3 at pin 36 of pic16f877a is set to output for led blinking
        delay_ms(1000);
    else
        PORTD.4 = 0xFF;      //PORT D AT  RD4 is nothing to do
        PORTB.2 = 0x00;      //PORT B AT rb2 at pin 35 of pic16f877a is set to output for led steady light
    }
}
 
}
}

..............the problems occur:
1. line 38 , 39, 40 .......too many parameters
2. line 46, .......;expected, but '6' found
3. line 46, .......'{' expected, but ';' found
4. line 95..........specifier needed
5. line 95........invalid declarator expected '(' or identifier
6. line 95.......internal error"

please help me to correct the configuration and the errors please

xpress_embedo · Feb 23, 2012

PORTD.6 = 0xFF; //port D is used fOr switching relay1 at RD6 at pin 29 of PIC16f877a is set to input for relay switching
// I do not know if it is PORTD.6.. i consider RD0, RD1, RD2, RD3, RD4, RD5,RD6, RD7 = pin 0,1,2,3,4,5,6,7
PORTD.6 = 0x00;
delay_ms(5000); //port D at at RD6 at pin 29 of PIC16f877a is set to output for relay switching

PORTB.7 = 0x00; //PORT B AT rb7 at pin 40 of pic16f877a is set to output for led blinking
delay_ms(1000);
PORTB.7 = 0xFF; //PORT B AT rb7 at pin 40 of pic16f877a is set to input for led blinking
delay_ms(1000);
else
PORTD.6 = 0xFF; //PORT D AT RD6 is nothing to do
PORTB.6 = 0x00; //PORT B AT rb6 at pin 39 of pic16f877a is set to output for led steady light
}

if (reading2>16){ // condition when the (adc reading-511*0.012207) is greater to the set value of 16 amperes
//adc reading-511*0.012207 = amperes.......
PORTD.5 = 0xFF; //port D is used fpr switching relay2 at RD5 at pin 28 of PIC16f877a is set to input for relay switching
// I do not know if it is PORTD.5.. i consider RD0, RD1, RD2, RD3, RD4, RD5,RD6, RD7 = pin 0,1,2,3,4,5,6,7
delay_ms(5000);
PORTD.5 = 0x00;
delay_ms(5000);

PORTB.5 = 0x00; //PORT B AT rb5 at pin 38 of pic16f877a is set to output for led blinking
delay_ms(1000);
PORTB.5 = 0xFF; //PORT B AT rb5 at pin 38 of pic16f877a is set to input for led blinking
delay_ms(1000);
else
PORTD.5 = 0xFF; //PORT D AT RD5 is nothing to do
PORTB.4 = 0x00; //PORT B AT rb4 at pin 37 of pic16f877a is set to output for led steady light
}

All this are errors..
You are trying to access single bits and sending 8-bit data on a single bit pin..
How is it possible.

void ADCInit(){ //configuring adc module
}
unsigned int ADCRead(){

ADCON1 = 0xFF; //configuring AN0-AN7 as analog inputs and VREF
ADCON0 = 0x07; //configuring analog channels AN0, AN1, AN2
ADON_BIT = 1; //switch on adc module
GO_DONE_BIT =1 ; //start conversion

What is all this

ADCON0 = 0x07;
Means u are enabling A/D converter and also starting the conversion
Strange..
Let me give you a sample code..

glenndingding · Feb 24, 2012

that is why sir arun i am opening this problem because i am new to this micro c just a couple of days. i appreciate if you give me a sample code sir thank u so much

xpress_embedo · Feb 24, 2012

Here is the Code..
The code is self explanatory

Code:

// LCD module connections
sbit LCD_RS at RC0_bit;
sbit LCD_RW at RC1_bit;
sbit LCD_EN at RC2_bit;
sbit LCD_D4 at RB4_bit;
sbit LCD_D5 at RB5_bit;
sbit LCD_D6 at RB6_bit;
sbit LCD_D7 at RB7_bit;

sbit LCD_RS_Direction at TRISC0_bit;
sbit LCD_EN_Direction at TRISC2_bit;
sbit LCD_D4_Direction at TRISB4_bit;
sbit LCD_D5_Direction at TRISB5_bit;
sbit LCD_D6_Direction at TRISB6_bit;
sbit LCD_D7_Direction at TRISB7_bit;
// End LCD module connections


unsigned int temp_data;
unsigned char adc_data[16];
void main()
{
 //Configuring all as  Analog Channels and Display Data on Channel-0 on LCD
 //Data Displayed on LCD is as it is.
 //No Conversion Occurs
 ADCON0 = 0x81;
 ADCON1 = 0xC0;      //Made all channel as analog channels
 Lcd_Init();
 Delay_ms(100);
 LCD_RW = 0;
 Lcd_Cmd(_LCD_CLEAR);
 Lcd_Cmd(_LCD_CURSOR_OFF);
 ADC_Init();
 Delay_ms(100);
 while(1)
 {
  Lcd_Cmd(_LCD_CLEAR);
  Lcd_Out(1,1,"ADC DATA");
  temp_data = ADC_Read(0);
  IntToStr(temp_data,adc_data);
  Lcd_Out(2,1,adc_data);
  Delay_ms(1000);
 }
}

Here is the Circuit Diagram

Here is simulation.. that is working fine

alexan_e · Feb 24, 2012

This thread is duplicate so I'm locking it.
You can continue the discussion in https://www.edaboard.com/threads/241955/

Welcome to EDAboard.com

adc configuration and conditional statement using micro c

glenndingding

Newbie level 5

xpress_embedo

Advanced Member level 4

glenndingding

Newbie level 5

xpress_embedo

Advanced Member level 4

alexan_e

Administrator

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Connect with us

Online statistics

Forum statistics