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thinkpositivex23
Joined: 20 Dec 2009
Posts: 7
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| thinkpositivex23 |
 Posted: Sat Feb 27, 2010 4:13 am |
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HELLO......plzz help me
I have compiled the 2 parts of circuit with zero error.
1part - lcd voltmeter
| Code: |
#include <16F877a.H>
#device adc =10;
#fuses XT,NOWDT,NOPROTECT,BROWNOUT,PUT,NOLVP
#use delay (clock=4000000)
#include <LCD.C>
void main()
{
int16 adc_value;
float volts;
float setup;
lcd_init();
setup_adc (ADC_CLOCK_DIV_32);
setup_adc_ports(AN0);
set_adc_channel(0);
delay_us(10);
while(1)
{
adc_value = read_adc();
volts = (float)(adc_value * 5)/1023.0;
setup = volts*2.4;
printf(lcd_putc, "\fVOLT:%3.2f", setup);
delay_ms(500);
}
}
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2part - keypad
| Code: |
#include <16f877a.h>
#fuses XT,NOWDT,PUT,NOBROWNOUT,NOLVP
#use delay(clock=4000000)
#define use_portb_kbd TRUE
#include <LCD.C>
#include <KBD.C>
void main()
{
char k;
lcd_init();
kbd_init();
lcd_putc("\f ENTER VOLTAGE:\n");
while (TRUE)
{
k=kbd_getc();
if(k!=0)
if(k=='*')
lcd_putc('\f');
else
lcd_putc(k);
}
}
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My problem is what should I do in order to combine the two parts
in order to make sure my project operate. The operation of my project is
I want to make the circuit lcd voltmeter operate and display on the LCD,
after that the user is capable to enter the voltage by using keypad.
The circuit that I combine is as shown below:
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Feb 28, 2010 1:01 am |
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Tell us the overall purpose of your project. Are you trying to make
a piece of test equipment for a lab ? What type of test equipment ?
What is the purpose ? |
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thinkpositive
Guest
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| Posted: Sun Feb 28, 2010 5:26 am |
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No...actually my project is a monitoring system.
The circuit that I design its capable to sense the voltage (Va) by using a
variable resistor and the voltage output will be display on the lcd, after
that the user is capable to enter the voltage or Vrated or desired voltage
(Vb) by using the keypad.
The next stage of this project is, the difference between the value of
voltage entered and the voltage sensed by the variable resistor will be
compared. If the voltage (Va) is less than Vrated (Vb) the lcd will initiate
the user to charged. |
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thinkpositive
Guest
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| Posted: Sat Mar 06, 2010 8:44 pm |
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| plz help me..... |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Mar 08, 2010 4:50 pm |
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I did the first part of your program for you. Let's see if you can finish it.
This program combines your two programs. In "Normal" mode, it
displays the A/D value on the LCD. When you press a key on the
keypad, it goes into "Setup" mode. Then you can enter 3 numbers.
When you press a 4th key, it exits Setup mode and goes back to normal
mode.
In the keypad driver file, the debounce factor must be set to 0.
(It was 33). Example:
| Code: |
#define KBD_DEBOUNCE_FACTOR 0
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| Code: |
#include <16F877.H>
#device adc=10
#fuses XT, NOWDT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#include "flex_lcd.c"
#include "flex_kbd.c"
// Wait for a key to be pressed. Then return it.
char keypad_getc(void)
{
char retval;
while(1)
{
retval = kbd_getc();
if(retval)
return(retval);
delay_ms(10);
}
}
//--------------------------------------
void lcd_setcursor_vb(short visible, short blink)
{
lcd_send_byte(0, 0xC | (visible<<1) | blink);
}
//======================================
void main()
{
char k;
int16 adc_value;
float volts;
float setup;
int8 loop_count;
int8 setup_count;
lcd_init();
kbd_init();
setup_adc (ADC_CLOCK_DIV_8);
setup_adc_ports(AN0);
set_adc_channel(0);
delay_us(20);
loop_count = 0;
while(1)
{
// Update LCD every 500 ms (50 * 10ms = 500ms)
if(loop_count++ == 50)
{
loop_count = 0;
adc_value = read_adc();
volts = (adc_value * 5) / 1023.0;
printf(lcd_putc, "\fVOLT: %3.2f", volts);
}
// Poll keypad driver every 10 ms
k = kbd_getc();
// Press any key to go into Setup mode.
if(k)
{
printf(lcd_putc, "\fSETUP: ");
lcd_setcursor_vb(TRUE, TRUE); // LCD cursor on
setup_count = 0;
// Get setup number in this loop. Example 1.23
while(1)
{
k = keypad_getc(); // Wait for keypress
lcd_putc(k); // Display key
setup_count++;
if(setup_count == 1) // After first number,
lcd_putc('.'); // display decimal point
// If user has entered 3 numbers, then exit the loop.
if(setup_count == 3)
{
lcd_setcursor_vb(FALSE, FALSE); // LCD cursor off
break;
}
}
// Wait for any keypress to exit Setup mode.
keypad_getc();
}
delay_ms(10);
}
}
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thinkpositivex23
Joined: 20 Dec 2009
Posts: 7
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| Program not function |
| Posted: Sun May 02, 2010 7:54 pm |
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Thank for your reply PCM programmer. For your information I already compile the previous program n it function the keypad not display the number that I press....
Below program show the lcd will display the voltage VOLT:..... at normal condition, and after 500ms the LCD display " Enter voltage" : at setup condition. The user able to enter the value and the value is shown on the lcd then after the 3 number is press the lcd back to normal condition and display the status of volt.
What should I add in the program after 3 number is press on the LCD to ensure that lcd back to normal condition.
| Code: |
#include <16f877a.h>
#device adc =10;
#fuses XT,NOWDT,PUT,NOBROWNOUT,NOLVP
#use delay(clock=4000000)
#define use_portb_kbd TRUE
#include <LCD.C>
#include <KBD.C>
// Wait for a key on the keypad to be pressed. Then return it.
char wait_kbd_getc(void)
{
char retval;
while(1)
{
retval = kbd_getc();
if(retval)
return(retval);
delay_ms(10);
}
}
void main()
{
int16 adc_value;
float volts;
float setup;
char k;
lcd_init();
kbd_init();
setup_adc (ADC_CLOCK_DIV_32);
setup_adc_ports(AN0);
set_adc_channel(0);
delay_us(10);
while(1)
{
adc_value = read_adc(); // read value adc
volts = (float)(adc_value * 5)/1023.0; // 1023.0 display float on LCD
setup = volts*2.4; // ratio between 12v/5v
printf(lcd_putc, "\fVOLT:%3.2f", setup);
delay_ms(500);
// delay 500 ms,display ENTER VOLTAGE on LCD//
lcd_putc("\f ENTER VOLTAGE:\n");
while (TRUE)
{
k=kbd_getc();
if(k!=0)
if(k=='*')
lcd_putc('\f');
else
lcd_putc(k);
}
}
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun May 02, 2010 9:17 pm |
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I think you are asking how to break out of the while() loop if you get a key.
Just add a break statement for the 'else' condition, as shown below.
| Code: | while(TRUE)
{
k=kbd_getc(); // Wait for key to be pressed
if(k=='*')
lcd_putc('\f');
else
{
lcd_putc(k);
break; // Break out of loop if get 0-9 or # keys.
}
}
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Also, you don't need to test if k!=0. That's because the kbd_getc()
function only returns if it gets a non-zero value from the kbd.c driver.
I have deleted the line that tests for k!=0. |
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thinkpositivex23
Joined: 20 Dec 2009
Posts: 7
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| not function |
| Posted: Mon May 03, 2010 1:45 pm |
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I already compile program as below but I am not able to enter the
voltage because the display enter voltage is display in short time...what
should I add in program to ensure that the user able to enter the value ?
| Code: |
#include <16f877a.h>
#device adc =10;
#fuses XT,NOWDT,PUT,NOBROWNOUT,NOLVP
#use delay(clock=4000000)
#define use_portb_kbd TRUE
#include <LCD.C>
#include <KBD.C>
// Wait for a key on the keypad to be pressed. Then return it.
char wait_kbd_getc(void)
{
char retval;
while(1)
{
retval = kbd_getc();
if(retval)
return(retval);
delay_ms(10);
}
}
void main()
{
int16 adc_value;
float volts;
float setup;
char k;
lcd_init();
kbd_init();
setup_adc (ADC_CLOCK_DIV_32);
setup_adc_ports(AN0);
set_adc_channel(0);
delay_us(10);
while(1)
{
adc_value = read_adc(); // read value adc
volts = (float)(adc_value * 5)/1023.0; // 1023.0 display float on LCD
setup = volts*2.4; // ratio between 12v/5v
printf(lcd_putc, "\fVOLT:%3.2f", setup);
delay_ms(500);
// delay 500 ms,display ENTER VOLTAGE on LCD//
lcd_putc("\f ENTER VOLTAGE:\n");
}
while(TRUE)
{
k=kbd_getc(); // Wait for key to be pressed
if(k=='*')
lcd_putc('\f');
else
{
lcd_putc(k);
break; // Break out of loop if get 0-9 or # keys.
}
}
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon May 03, 2010 1:51 pm |
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How many numbers do you want the user to enter for the voltage ?
Is it just one number, such as '3' ? |
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thinkpositivex23
Joined: 20 Dec 2009
Posts: 7
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| Posted: Mon May 03, 2010 8:23 pm |
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I want to enter 2 decimal places such as... "3.70". Below is my circuit...
Uploaded with ImageShack.us |
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thinkpositivex23
Joined: 20 Dec 2009
Posts: 7
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| Posted: Tue May 04, 2010 8:24 am |
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| helo PCM programmer...i need guide from you.....plz help me |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue May 04, 2010 2:27 pm |
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I wrote some code for you in a earlier post in this thread. It gets 3
numbers. I've done enough on this thread. |
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thinkpositivex23
Joined: 20 Dec 2009
Posts: 7
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| update lcd |
| Posted: Tue May 04, 2010 3:59 pm |
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i already compile the previous coding but i can't enter the 2 decimal places....
please check my code...
| Code: |
#include <16f877a.h>
#device adc =10;
#fuses XT,NOWDT,PUT,NOBROWNOUT,NOLVP
#use delay(clock=20000000)
#define use_portb_kbd TRUE
#include <LCD.C>
#include <KBD.C>
// Wait for a key on the keypad to be pressed. Then return it.
char wait_kbd_getc(void)
{
char retval;
while(1)
{
retval = kbd_getc();
if(retval)
return(retval);
delay_ms(10);
}
}
//--------------------------------------
void lcd_setcursor_vb(short visible, short blink)
{
lcd_send_byte(0, 0xC | (visible<<1) | blink);
}
//======================================
void main()
{
int16 adc_value;
float volts;
float setup;
char k;
int8 loop_count;
int8 setup_count;
lcd_init();
kbd_init();
setup_adc (ADC_CLOCK_DIV_32);
setup_adc_ports(AN0);
set_adc_channel(0);
delay_us(10);
while(1)
{
// Update LCD every 500 ms (50 * 10ms = 500ms)
if(loop_count++ == 900)
{
loop_count = 0;
adc_value = read_adc(); // read value adc
volts = (float)(adc_value * 5)/1023.0; // 1023.0 display float on LCD
setup = volts*2.4; // ratio between 12v/5v
printf(lcd_putc, "\fVOLT:%3.2f", setup);
}
// Poll keypad driver every 10 ms
k = kbd_getc();
// Press # key to go setup mode
if(k=='#')
{
printf(lcd_putc, "\fENTER VOLTAGE: ");
lcd_setcursor_vb(TRUE,TRUE); //LCD cursor on
setup_count = 0;
// Get setup number in this loop. Example 1.23
while (1)
{
k=wait_kbd_getc(); // wait key press
lcd_putc(k); // display key
setup_count++;
if(setup_count == 1) // After first number,
lcd_putc('.');
// If user has entered 3 numbers, then exit the loop.
if(setup_count == 3)
{
lcd_setcursor_vb(FALSE, FALSE); // LCD cursor off
break;
}
}
// Wait for any keypress to exit Setup mode.
wait_kbd_getc();
}
delay_ms(10);
}
}
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Wed May 05, 2010 3:06 am |
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| Code: | // Update LCD every 500 ms (50 * 10ms = 500ms)
if(loop_count++ == 900) |
Loop_count is an int8, it can only count up to 255. Change to an int16.
Also your comments and code don't match.
Note:
You might have thought this part of the code to work correct but that's only by chance. The 900 value is truncated to an int8 --> 900 dec == 0x384, trunk to int8 becomes 0x84 == 132 dec.
So instead of updating each 500ms it updates every 1.3s but this is easy to overlook.
What is your problem in creating the value with 2 decimal places?
Your current code will accept the user to enter 3 digits and you show these on the screen. So the only thing left to do is to assemble these 3 digits into a single variable. Is this the step you have problems with? |
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