Car Backseat Table System using PIC Micro-controller

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Before installing micro controller to operate car backseat table read previous posts about how to install mechanical parts, installing dc motor and position sensors

First of all select any micro-controller  which is available and have external interrupts.
I am using PIC-16f1789 in car backseat tray table

 Identify signals to operate the system
To operate Car back seat table using micro-controller we need 3 signals for each table.

  1. One signal from open and close command to each table
  2. Detect open position of each table
  3. Detect close position of each table
Here we are operating two tables so we need total six signals which are connected to port A through current limiting resistors(value of which depends on device type, specified on datasheet of I.C. you  are using).
Car backseat tray using microcontroller
Electrical specifications for PIC 16f1789

Port A is used for interrupt input.Connections will be as follows.

  1. port A,1 connect with open/close button for table 1.
  2. port A,2 connect with open/close button for table 2.
  3. port A,3 connect with open position sensor for table 1.
  4. port A,4 connect with close position sensor for table 1.
  5. port A,5 connect with open position sensor for table 2.
  6. port A,6 connect with close position sensor for table 2.
Port B is used for output, Connections will be as follows

  1. port B,1 to one pin of motor 1.
  2. port B,2 to other pin of motor 1.
  3. port B,3 to one pin of motor 2.
  4. port B,4 to other pin of motor 2.
pin diagram of PIC 16f1789
pin diagram of PIC 16f1789
to synchronize direction of rotation you may have to swap pin connections of motors.
Give on/off signal from micro-controller to the motor through transistors as shown below
write code for Pic 16f1789 using Mplab and make hex file . upload in your vsm modeling tool like proteus and burn in the ic using pickit3.
Car backseat table using pic micro-controller
Car backseat table using pic micro-controller


Here is complete code .


#include "p16F1789.inc"
; CONFIG1
; __config 0xFFE4
 __CONFIG _CONFIG1, _FOSC_INTOSC & _WDTE_OFF & _PWRTE_OFF & _MCLRE_ON & _CP_OFF & _CPD_OFF & _BOREN_ON & _CLKOUTEN_OFF & _IESO_ON & _FCMEN_ON
; CONFIG2
; __config 0xFEFF
 __CONFIG _CONFIG2, _WRT_OFF & _VCAPEN_OFF & _PLLEN_OFF & _STVREN_ON & _BORV_LO & _LPBOR_OFF & _LVP_ON
ORG 000H
GOTO MAIN
ORG 0004H
BTFSS INTCON,IOCIF
RETFIE
GOTO TABLE_SELECT
ORG 0020H
TABLE_SELECT
BANKSEL INLVLA
BTFSC IOCAF,2
    GOTO STOP_M1
BTFSC IOCAF,3
    GOTO STOP_M1
BTFSC IOCAF,4
    GOTO STOP_M2
BTFSC IOCAF,5
    GOTO STOP_M2
BTFSC IOCAF,0
     GOTO TABLE_1
BTFSC IOCAF,1
    GOTO TABLE_2
        RETFIE
    
TABLE_1
    BANKSEL PORTA
    BTFSS PORTA,2 ;SENSOR TO READ OPEN POSITION CONNECTED TO PIN 3 OF PORTA//
    GOTO OPEN_M1
    BTFSS PORTA,3 ;SENSOR TO READ CLOSE POSITION CONNECTED TO PIN 4 OF PORTA//
    GOTO CLOSE_M1
    RETFIE
TABLE_2
    BANKSEL PORTA
    BTFSS PORTA,4  ;SENSOR TO READ OPEN POSITION CONNECTED TO PIN 5 OF PORTA
    GOTO OPEN_M2
    BTFSS PORTA,5  ;SENSOR TO READ CLOSE POSITION CONNECTED TO PIN 6 OF PORTA
    GOTO CLOSE_M2
    RETFIE
OPEN_M1                    ; turns on motor to open table 1
    BANKSEL LATA
    BSF LATB,0
    BCF LATB,1
    BANKSEL INLVLA
    BCF IOCAF,0
    ;add
    RETFIE
CLOSE_M1     ; reverses the motor to close table 1
    BANKSEL LATA
    BCF LATB,0
    BSF LATB,1
    BANKSEL INLVLA
    BCF IOCAF,0
    RETFIE
OPEN_M2     ; turns on motor to open table 2
    BANKSEL LATA
    BSF LATB,2
    BCF LATB,3
    BANKSEL INLVLA
    BCF IOCAF,1
    RETFIE
CLOSE_M2     ; reverses the motor for table 2
    BANKSEL LATA
    BCF LATB,2
    BSF LATB,3
    BANKSEL INLVLA
    BCF IOCAF,1
    RETFIE
STOP_M1     ;stop motor for table 1
    BANKSEL LATA
    BCF LATB,0
    BCF LATB,1
    BANKSEL INLVLA
    BCF IOCAF,2
    BCF IOCAF,3
    RETFIE
STOP_M2 ;stop motor for table 2
    BANKSEL LATA
    BCF LATB,2
    BCF LATB,3
    BANKSEL INLVLA
    BCF IOCAF,4
    BCF IOCAF,5
    RETFIE
MAIN
    BANKSEL INTCON      ; selecting bank
    BSF INTCON,GIE ; enable global interrup
    BSF INTCON,PEIE ; enable periphiral interrupt
    BSF INTCON,IOCIE ; enable interrupt on change
    BANKSEL TRISA ; bank select
    MOVLW B'11111111' ; port A as input
    MOVWF TRISA
    BANKSEL INLVLA
    MOVLW B'00111111'
    MOVWF IOCAP ; selecting interrup on change pins for positive edge interrup
    MOVLW B'00000011'
    MOVWF IOCAN ; selecting interrup on change pins for negative edge interrup
HERE
    GOTO HERE
    END

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