7 years ago I blogged about…

Digitizing my Beer Can Collection

…

Photo Studio Setup

Stepper Motor with a ULN2003APG controller Aukey HD Webcam

#!/usr/bin/env python
from time import sleep, time
import RPi.GPIO as GPIO
import os
import pygame
import pygame.camera
 
# GPIO pins to use for stepper
pins = [ 24, 25, 8, 7 ]
 
button = 11
 
# stepper sequences
sequences = [[1,0,0,1],
       [1,0,0,0],
       [1,1,0,0],
       [0,1,0,0],
       [0,1,1,0],
       [0,0,1,0],
       [0,0,1,1],
       [0,0,0,1]]
 
# global camera instance
cam = None
 
def setup():
    """ initialize everythin """
    global cam
 
    # use GPIO numbers
    GPIO.setmode(GPIO.BCM)
 
    # set up stepper pins
    for pin in pins:
        GPIO.setup(pin, GPIO.OUT)
        GPIO.output(pin, 0)
 
    # set up button pin
    GPIO.setup(button, GPIO.IN, pull_up_down=GPIO.PUD_UP)
 
    pygame.camera.init()
    camlist = pygame.camera.list_cameras() #Camera detected or not
    print "using camera %s" % camlist[0]
    cam = pygame.camera.Camera(camlist[0],(2048, 1080))
    cam.start()
 
    cam.get_image()
    sleep(3) #wait for white balance
    cam.get_image()
 
def sequence(seq):
    """ execute a single step sequence, eight of them make one step """
 
    # set pins to correct sequence
    for idx, val in enumerate(seq):
        GPIO.output(pins[idx], val)
 
    # give it a bit to move
    sleep(0.005)
 
    # reset all pins to off
    for pin in pins:
        GPIO.output(pin, 0);
 
 
 
def left(step):
    """ do this many steps to the left """
    for i in range (step):  
        for seq in sequences:
            sequence(seq)
 
def right(step):
    """ do thi many steps to the right """
    for i in range (step):
        for seq in reverse(sequences):
            sequence(seq)
 
 
def run():
    out = "out/%s" % time()
    os.mkdir(out)
    for x in range(8):
        # take picture
        cam.get_image()
        cam.get_image()
        img = cam.get_image()
        pygame.image.save(img, "%s/image%d.jpg" % (out, x))
        print "saved %s/image%d.jpg" % (out, x)
        left(512/8) # turn an eigth
 
setup()
while True:
    run()
    while True:
        input_state = GPIO.input(button)
        if input_state == False:
            break
        sleep(0.2)
 
GPIO.cleanup()