Termómetro con 16F877A

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El proyecto Termómetro digital con PIC 16F877A, LM35 Y LCD puede ser distribuido tal cual solamente si se enlaza la página fuente en proyectoslibres.com

Contenido

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1 Termómetro digital con PIC 16F877A, LM35 Y LCD 2 Errores comunes 3 Lista de materiales 4 Simulación 5 Código para mikroC 6 Código ensamblador 7 Hexadecimal 8 Ver también 9 Fuentes

partner-pub-3293 FORID:10 ISO-8859-1

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[editar] Termómetro digital con PIC 16F877A, LM35 Y LCD

El siguiente proyecto de electrónica es un termómetro digital hecho con un PIC 16F877A, como sabemos, este PIC contiene un convertidor analógico/digital que se puede aprovechar para representar cualquier señar física en un un LCD.El circuito se basa en 2 componentes principales el sensor de temperatura LM35 y el PIC 16F877A. El LM35 actúa es el sensor de temperatura, convierte la temperatura ambiente en una señal de eléctrica, cada 10mV representan 1°C. Esta señal de voltaje pasa por el convertidor A/D a nuestro PIC que muestra los datos en el LCD.La forma más fácil de hacer el código para el PIC es mediante mikroC, el texto ("text=") puede ser cambiado por uno personalisado.

Vista previa del proyecto implementado

[editar] Errores comunes

Nunca hay que olvidar agregar retardos por medio de Delay_ms para que el LCD inicie correctamente y no aparezca el LCD con signos extraños.

En la simulación de Proteus no es necesario conectar las entradas restantes (sin conexión) a tierra, pero implementando el circuito si no se conectan a tierra el LCD no enciende o se corren en la pantalla símbolos raros.

[editar] Lista de materiales

LM35 PIC 16F877A 2 Capacitores 22pF Cristal de 10Mhz o 4MHz LCD 16x2 Resistencia 100 Ohms Resistencia 10K Ohms Resistencia 1.7K Ohms Capacitor 0.1uF

[editar] Simulación

Dudas y aclaraciones sobre el diseño, escríbelas en los comentarios.

Simulación en ProteusArchivo de simulación en Proteus

[editar] Código para mikroC

unsigned char ch;unsigned int adc_rd;char *text,*text1;long tlong;int i,j;void main() { INTCON = 0; Lcd_Config(&PORTB, 4, 5, 6, 3, 2, 1, 0); LCD_Cmd(LCD_CURSOR_OFF); LCD_Cmd(LCD_CLEAR); for(i=0;i<5;i++){ LCD_Cmd(LCD_CLEAR); text = "INGENIERIA";

LCD_Out(1,i,text); Delay_ms(100); } text1 = "ELECTRONICA"; LCD_Out(2,3,text1); ADCON1 = 0x82; TRISA = 0xFF; Delay_ms(1000); LCD_Cmd(LCD_CLEAR);

text = "Temperatura:"; for(j=16;j>0;j--){ LCD_Cmd(LCD_CLEAR); LCD_Out(1,j,text); Delay_ms(100); }

while (1) { adc_rd = ADC_read(2);

tlong = (long)adc_rd * 5000; tlong = tlong / 1023 - 40; ch = tlong / 1000;

if(ch==0) LCD_Chr(2,6,' '); else LCD_Chr(2,6,48+ch);

ch = (tlong / 100) % 10;

LCD_Chr_CP(48+ch); ch = (tlong / 10) % 10; LCD_Chr_CP(48+ch); LCD_Chr_CP('.');

ch = tlong % 10; LCD_Chr_CP(48+ch); LCD_Chr_CP('C'); Delay_ms(10000); }}}

Archivo mikroC

[editar] Código ensamblador

Desargar termómetro con PIC16F877A archivo .asm

[editar] Hexadecimal

Desargar termómetro con PIC16F877A archivo .hex

[DeviceName]Value=P16F877A[DeviceClock]Value=4[MainUnit]Value=[DeviceFlags]Count=3Value0=_LVP_OFF = $3F7FValue1=_WDT_OFF = $3FFBValue2=_XT_OSC = $3FFD[BuildType]bType=0[ProjectFiles]Count=1Value0=termometro.c[HeaderFiles]Count=0[ObjLibFiles]Count=0[PLDFiles]Count=0[EEPROMinfo]isused=0[SearchPath]Count=4Value0=C:\Archivos de programa\Mikroelektronika\mikroC\Defs\Value1=C:\Archivos de programa\Mikroelektronika\mikroC\Uses\p16\Value2=C:\Documents and Settings\Propietario\Escritorio\temperatura\Value3=C:\Archivos de programa\Mikroelektronika\mikroC\Examples\EasyPic5\P16F887\LED_Blinking\[IncludePath]Count=0

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