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pic16F887 & LCD Problem
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pyu



Joined: 04 Feb 2009
Posts: 51

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PostPosted: Thu Feb 05, 2009 3:32 pm     Reply with quote

Yes now it's working, it's working. I change two wires Smile

But I have one more question: how can I use backlight for this lcd?
PCM programmer



Joined: 06 Sep 2003
Posts: 21477

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PostPosted: Thu Feb 05, 2009 4:28 pm     Reply with quote

Here is a web page with an LED series resistor calculator:
http://www.bowdenshobbycircuits.info/led.htm
You can put in these values:
(These numbers come from the RC2004 data sheet in your link)
Code:

Total LEDs   LED voltage   LED current   Total Voltage       
    1            4.2           280            5

Then press the "Find Resistor" button to calculate the series resistor value
and watts.

I got 3 ohms, and .213 watts, so you really should use a 1/2 watt resistor.

Connect +5v to the 3 ohm resistor, then connect the other side of the
resistor to the "A" pin on the LCD. Connect the "K" pin to ground.
Make sure your voltage regulator and power supply for your board can
supply the extra 280 ma to run the backlight.

----------------
Edit: Updated the link.


Last edited by PCM programmer on Sat Jan 22, 2011 1:24 pm; edited 1 time in total
pyu



Joined: 04 Feb 2009
Posts: 51

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PostPosted: Sat Feb 07, 2009 10:54 am     Reply with quote

Thanks... The backlight it's working now Smile

But now I had another problem :(
I try to make a thermostat with DS18B20 sensor.
I used some sources from http://loginway.net/the-ds18b20-digital-thermometer-and-pic16f877a-microcontroller-on-pic-01-development-board/

main.c:

Code:

#include <16F887.H>

#device adc=8

#include <math.h>

#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP, NOCPD

#use delay(clock = 20000000)
#include "Flex_LCD416.c"
#include "1wire.h"

int i,read_ok;
byte buffer[8];
signed int16 t,t1;
int fTemp=0;
int iWrite=0;

void main()
{

float temperature;

SET_TRIS_B(0x01);
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(VREF_LOW|-2);

delay_ms(50);

// The lcd_init() function should always be called once,
// near the start of your program.
lcd_init();

// Clear the LCD.
printf(lcd_putc, "\f");

//start here
printf(lcd_putc, "\fThis is a test");
printf(lcd_putc, "   program!");
delay_ms(1000);
printf(lcd_putc, "\f");

while(1)
     {


if(init_1wire())
{
   write_1wire(0xcc); //skip ROM
   write_1wire(0x44); //convert T
}
if(init_1wire())
{
   write_1wire(0xcc); //skip ROM
   write_1wire(0xbe); //read scratchpad
   for(i=0;i<8;i++)
     buffer[i]=read_1wire();
   read_ok=1;
}
if(read_ok)
{
   t=make16(buffer[1],buffer[0]); //calculate temperature
   t=(float)t/16.0; //Calculation 0.1 deg C resolution

printf(lcd_putc, "\f");
printf(lcd_putc, "ok = true");
fTemp = (int)t/16.0;
temperature = (float)t/16.0;

delay_ms(500);
}

lcd_gotoxy(1,1);
//printf(lcd_putc,"Temp= %3.1f \uC", t);
printf(lcd_putc, "\f");
printf(lcd_putc,"Temp1= %2.1f \uC", temperature);
lcd_gotoxy(1,2);
printf(lcd_putc,"X= %3i \ori", iWrite);
lcd_gotoxy(1,3);
printf(lcd_putc,"Temp2= %3.1d \uC", fTemp);
iWrite++;
//\u displays degree sign
delay_ms(500);

     }   

}


and 1wire.h:
Code:

//-----------------------------------------------------
// 1wire.h
//-----------------------------------------------------
//-------------------------data pin definition-----------
#define DQ pin_a1
//I used RA1.

//--------------------------1wire reset-----------------


and the result is:
Temp1 = 0.0 uc
Temp2 = 0 uc
x= ... (is not importing)
and ok = true ...

Can you help me with this problem ?
Thanks ;)
PCM programmer



Joined: 06 Sep 2003
Posts: 21477

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PostPosted: Sat Feb 07, 2009 12:44 pm     Reply with quote

I have not used the DS18B20 sensor. There are many posts on the
forum with sample code for that chip. Use the forum's search page to
find it. There is code in the Code Library forum.
pyu



Joined: 04 Feb 2009
Posts: 51

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PostPosted: Mon Feb 09, 2009 2:13 am     Reply with quote

I made some researches, and in this moment it's showing a 16 time smaller temperature.
I don't know what the problem is, but here
Code:
t=(float)t/16.0; //Calculation 0.1 deg C resolution

it showing 1.5 deg C, and here
Code:
t=(float)t; //Calculation 0.1 deg C resolution

It is showing 25 deg C, and a camera thermometer is showing 26 deg.
I will test it with lower and higher temperatures.
pyu



Joined: 04 Feb 2009
Posts: 51

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PostPosted: Tue Feb 10, 2009 1:11 am     Reply with quote

I have another question. I want to use 4 proximity sensors in my application.
I found GP2Y0A02YK0F 200-1500mm, but the price is not very good (4 * 25 $ = 100 $). Doesn't exist something cheaper?
A Golden Eye parking system (http://www.autoaccesorii.ro/standard_products.php?id=3184 ) is only 70$.
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