PIC PIC16F876A based panoramic camera controller.

by Jody Wisman

for the Olimex sponsored PCB contest

It is a Design to control a camera.

I have put the camera on a stepper motor and let the pic control the motor. {ed: The PIC puts out Step and Direction signals which will direct a stepper motor controller to actually move the motor. See Stepper Motor Controllers for a list of options}

It turns the camera and, with the relays output connected to the shutter, it takes a picture...

Works fine and makes nice panorama pictures...

I am now working on one which can control two motors so the camera can also take pictures above and below the horizon..

Included is the code in CCS C, and the Schematic and PCB designed in Mentor Graphics.....

Schematic:

Sample Stepper Motor Driver schematic (not included on this board)

Code:

camstepcode.zip

Camera_Stepper.c 

#include "Camera_Stepper.h"


// Defines
#define	RELAY				PIN_C0
#define	DIRECTION_IMT_1			PIN_A2
#define	STEP_IMT_1			PIN_A3
#define	DIRECTION_IMT_2			PIN_A4
#define	STEP_IMT_2			PIN_A5
#define	START_STOP			PIN_B0
#define	LEFTSOM				PIN_B1
#define	RIGHTSOM			PIN_B2

int1 	START 		=		FALSE;
int1 	STOP 		=		FALSE;
int16	MAX_STEP	=		1023;
 
#int_EXT 
void EXT_ISR() 
 { 
   	if(START == FALSE)// First times printed on start_stop
	{
	START = TRUE; 
	}else
	{
	STOP = TRUE;
	}
 }
void CAMERA_STEP()
{
int16 i, j;
	for (j = 0; j < 33; j++)
	{
	delay_ms(1000);
	output_high(RELAY);
	delay_ms(250);	
	output_low(RELAY);
		for(i = 0; i < MAX_STEP; ++i)
		{
		output_low(DIRECTION_IMT_1);
		delay_us (250);
		output_high (STEP_IMT_1);
		delay_us (250);
		output_low (STEP_IMT_1);
	/*	if (STOP == TRUE)
		{
		i = MAX_STEP;
		}*/
		}
	}
	START = FALSE;
	STOP = FALSE;
}

void initSystem(void)
{
   // System initialisation
 setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   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(FALSE);
   enable_interrupts(INT_EXT);
   enable_interrupts(GLOBAL);
}



void main()
{

initSystem();

   	while(1)
	{
		if(START)//We need to run a round.....
		{
		CAMERA_STEP();
		}
		if(!(input(LEFTSOM)))
		{
		output_low(DIRECTION_IMT_1);
		delay_us (250);
		output_high (STEP_IMT_1);
		delay_us (250);
		output_low (STEP_IMT_1);
		}
		if(!(input(RIGHTSOM)))
		{
		output_high(DIRECTION_IMT_1);
		delay_us (250);
		output_high (STEP_IMT_1);
		delay_us (250);
		output_low (STEP_IMT_1);
		}
	}
}

Camera_Stepper.h

#include <16F876A.h>
#device ICD=TRUE
#device adc=8

#FUSES NOWDT                 	//No Watch Dog Timer
#FUSES HS                    	//High speed Osc (> 4mhz)
#FUSES NOPUT                 	//No Power Up Timer
#FUSES NOPROTECT             	//Code not protected from reading
#FUSES NODEBUG               	//No Debug mode for ICD
#FUSES NOBROWNOUT              	//No Reset when brownout detected
#FUSES NOLVP                   	//No Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOCPD                 	//No EE protection
#FUSES NOWRT                 	//Program memory not write protected

#use delay(clock=12000000)

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