Ascensor Controlado por Assembler 1. Objetivos 1.1.
Objetivo General
Diseñar un programa en assembler, capaz de controlar un ascensor, mediante el puerto paralelo.
1.2.
Objetivos específicos
Diseñar un la arquitectura de un ascensor para poder realizar la prueba del programa controlador.
Poner en práctica los conocimientos adquiridos en clases en la aplicación de los proyectos.
Conocer y aplicar el puerto paralelo para la implementación en la union de software y hardware en el proyecto.
2. Antecedentes
El uso de las computadoras computadoras analógicas y digitales ha posibilitado la aplicación de ideas de control automático a sistemas físicos que hace apenas pocos años era imposibles de analizar o controlar. La automatización del control de plantas se va desarrollando de acuerdo a cada necesidad existente ya sea en la sociedad o en ámbito profesional, para esto es necesario obtener un conocimiento sobre la programación necesaria para el control específico de plantas. La gama de programas existentes que permiten controlar plantas, poseen distintas características que permiten al usuario elegir aquel que le facilite más su tarea, existen programas de bajo nivel hasta alto nivel, programas que permiten la creación de interfaces y aquellos que se especializan solo en la programación.
3. Fundamento Teórico 3.1.
Puerto Paralelo
El puerto paralelo de una PC es ideal para ser usado como herramienta de control de motores, relés, LED's, etc. El mismo posee un bus de datos de 8
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bits (Pin 2 a 9) y muchas señales de control, algunas de salida y otras de entrada que también pueden ser usadas fácilmente.
En este conector:
8 líneas (pines) son para salida de datos (bits de DATOS). Sus v alores son únicamente modificables a través de software, y van del pin 2 (dato 0, D0) al pin 9 (dato 7, D7). 5 líneas son de entrada de datos (bits de ESTADO), únicamente modificables a través del hardware externo. Estos pines son: 11, 10, 12, 1 2, 13 y 15, del más al menos significativo. 4 líneas son de control (bits de CONTROL), numerados del más significativo al menos: 17, 16, 14 y 1. Habitualmente son salidas, aunque se pueden utilizar también como entradas y, por tanto, se pueden modificar tanto por software como por hardware. las líneas de la 18 a la 25 son la tierra.
En la siguiente tabla se detallan la nomenclatura y descripción de cada línea. La columna "Centronics pin" se refiere a las líneas del conector tipo Centronics usado en las impresoras. La columna E/S se refiere al dato visto desde el lado del PC. DB25 Centronics Tipo pin
pin
(E/S)
1
1
S
Señal
Strobe
Descripción
Si está bajo más de 0.5 µs, habilita a la impresora para que reciba los datos enviados.
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3
3
S
D1
Bit 1 de datos
4
4
S
D2
Bit 2 de datos
5
5
S
D3
Bit 3 de datos
6
6
S
D4
Bit 4 de datos
7
7
S
D5
Bit 5 de datos
8
8
S
D6
Bit 6 de datos
9
9
S
D7
Bit 7 de datos, bit más significativo (MSB) Un pulso bajo de ~11µs indica que se han recibido datos
10
10
E
Ack
en la impresora y que la misma está preparada para recibir más datos.
11
11
E
12
12
E
PaperEnd En alto indica que no hay papel.
13
13
E
SelectIn En alto para impresora seleccionada.
14
14
S
AutoFeed
15
32
E
Error
16
31
S
Init
17
36
S
Select
1825 1825
19-30,33
16
Busy
GND
En alto indica que la impresora está ocupada.
Si está bajo, el papel se mueve una línea tras la impresión. En bajo indica error (no hay papel, está fuera de línea, error no det.). Si se envía un pulso en bajo > 50 µs la impresora se reinicia. En bajo selecciona impresora (en gral. no se usa, ya que SelectIn se fija a alto).
Masa retorno del par trenzado.
Masa lógica
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3.2.
Compilador Assembler
3.3.
Userport
UserPort.SYS es un modo de núcleo para Windows NT/2000/XP usermode que da acceso a los programas de E/S por puerto. Esto hace que sea posible acceder al hardware directamente desde un ejecutable normal de la misma manera que en virtud de Windows 95/98/ME. Este controlador no funciona en Windows 95/98/ME y realmente no hay necesidad de ejecutarlo de todos modos porque puertos I/0 son siempre usermode concedidas a los programas de estos sistemas operativos.
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sea para ascender o descender en un edificio o una construcción subterránea. Se conforma con partes mecánicas, eléctricas y electrónicas que funcionan conjuntamente para lograr un medio seguro de movilidad. 4. Fundamento Practico 4.1.
Materiales
4 Transistores TIP32
4 Transistores TIP31
7 Transistores BC548
4.2.
7404
7432
7408
Lm555
Capacitores de diferentes valores
Resistencias varias
Cables
Protoboards
Leds
Procedimiento 4.2.1. Programación
El código para la implementación se baso en sumas para determinar el número que saldría por el puerto paralelo (el diagrama de flujo se encuentra en anexos), estas sumas tendría que hacer lo siguiente: Habilitar el infrarrojo de Planta baja Habilitar el infrarrojo de primer paso Habilitar el infrarrojo de segundo piso Habilitar el infrarrojo de tercer piso Habilitar el infrarrojo de cuarto piso Habilitar el motor subida (en caso
00000001 00000010 00000100 00001000 00010000
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sea para cerrar el bit es igual a 0) Como se puede ver al hacer la combinación del piso q se habilita y determinar si el motor sube o baja, esto permitía al ascensor realizar la acción que pedíamos ya sea subir o bajar a determinado lugar, también se tuvo que determinar si en el programa poníamos un numero que no estaba dentro del rango o si se ponía una letra al poner cualquiera de estos, el programa bota un mensaje que dice ‘Ingrese otro piso’, también se enviaba este mensaje si el piso en el
que se encuentra es igual al piso al que desea ir. Para el controla de las puertas es solo era necesario introducir el numero uno para abrir la puerta y 0 para cerrarlas. Para ir de una parte del programa a otro se aplico los comandos para salto los cuales nos permiten comparar los números que introducimos y ver si es una opción válida dentro del programa. 4.2.2. Circuito
Para poder realizar el armado de todo el ascensor primeramente ser realizó el armazón que estaba basado en una estructura de 5 pisos como se puede observar en la imagen:
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En cada piso se coloco un infrarrojo , cada infrarrojo en su pin positivo iba conectado al emisor de un transistor, mientras que su pin negativo a una resistencia de 100 Ω y a tierra, esta tierra deberá conectarse con las tierras de los demás circuitos caso contrario los
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permitiría que cuando se encuentre con el infrarrojo de cada piso este pueda detener el motor. La salida del sumador de todos los l os pisos también se dirige a ser la entrada de dos diferentes AND cuya otra entrada será la entrada normal y negada que activara el motor de izquierda a derecha, cada salida del AND va conectado al puente H. La entrada que activara el motor para que cambie de sentido será enviada por el programa esto es decir que se conecta esta vez a otro AND para que su salida salida de ese AND ira al puerto paralelo. paralelo. La otra entrada de ese AND se dirige a voltaje, para el otro AND cuya salida ira al puerto paralelo tendrá como entrada a VCC mientras que la otra será la salida de abrir o cerrar puertas. Para armar este circuito de abrir y errar puerta se conecto otro motor cuyas entradas serán del puente H pero las entradas del puente H serán las salidas de dos AND , cada uno tendrá 3 entradas, el primer OR estará conectado con la salida de las suma de las 5 entradas de los infrarrojos , el bit que activara 0 o 1 para que se abra o cierre la puerta y a la salida del contador (reloj) , este reloj se tenia como entrada a un OR que sumaba a los dos flancos positivo y negativo que hacían que se active el motor un determinado tiempo y que cuando cambie de sentido se cierre la puerta y luego vuelva a cambiar de piso, cada flanco tenia como entrada al bit que se botaría por puerto para el flanco positivo y su negado del mismo al flanco negativo, la otra entrada del AND se conectaba al negado de las entradas de los infrarrojos, también al negado de la entrada botada por puerto y al contador. En las imágenes se muestra el circuito descrito anteriormente:
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Contador (reloj)
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Detector de Flancos
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Sumador de las entradas de los pisos y el fototransistor
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Unión de todo el circuito
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cien DB 100 .code .startup inicio: mov ax,0600h mov bh,08h mov cx,00h mov dx,314fh int 10h
;limpia la pantalla
;-----------------------------------------------------------mov ah,02h mov bh,00 mov dh,00 mov dl,00 int 10h mov ax,@data
; posiciona el cursor
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mov var2,AL ;----------------------------------------------------------------------------------------------------;Comprobamos piso en el que se encuentra error01: cmp var1, 6 jge compara1 jmp falla01 compara1: mov ah,09h lea dx,msg3 int 21h jmp llamada ;------------------------------------------------------------------------------------------------------falla01:
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compara2: mov ah,09h lea dx,msg3 int 21h jmp llamada ;------------------------------------------------------------------------------------------------------falla02: cmp var2, 0 jz verificar2 jmp Comparador verificar2: mov ah,09h lea dx,msg3 int 21h
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MOV var2,2 jmp comp piso3: MOV var2,4 jmp comp piso4: MOV var2,8 jmp comp piso5: MOV var2,16 jmp comp comp: cmp var1,al ja mayor jb menor je igual
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MOV DL,BL INT 21H jmp Puerta menor: MOV AH,9 LEA DX,ms2 INT 21H MOV AL,var2 ADD AL,64
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Puerta: mov dx, offset texto4 mov ah, 09h int 21h mov ah,01h int 21h SUB AL,30H mov var3,AL cmp var3, 0
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jmp llamada abrir: cmp var3,1 je abrir1 jne error03 abrir1: MOV AH,9 LEA DX,ms2
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;----------------------------------------------------------------------llamada: mov dx, offset texto3 mov ah, 09h int 21h mov ah,01h int 21h
SUB AL,30H mov var3,AL
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