def main():
print("initializing")
pool = ThreadPool(processes=1)
#Time operator have to push button after product is detected
IMG_SAVE_DELAY = 500
#This is used to signal that if operator dont push button then save image to approved folder
flagPhotoSensor = False
#Resolution on image
resolution = (1280, 720)
#Paths to put images
path_approved = '/media/storage/good/'
path_not_approved = '/media/storage/bad/'
#Create camera object that takes images and store in approved or not approved folder
camera = Camera(resolution, 'png', path_approved, path_not_approved)
#GPIO stuff
on_off = GPIO(7, 'in')
disallowed_img = GPIO(138, 'in')
disallowed_img.edge = 'rising'
photoSensor = GPIO(140, 'in')
photoSensor.edge = 'rising'
#Create Display object
display = Display()
#Variable to handle debounce on input from photosensor
lastPhotoSensorValue = False
#Variable to handle debounce on input from operator button
lastOperatorBtnValue = False
#Get time in ms
currentTime_ms = lambda: int(round(time.time() * 1000))
#Calculate new time - old time to get time difference between two events
deltaTime_ms = lambda oldTime_ms: int(round(time.time() * 1000)
) - oldTime_ms
#Store time to calculate time difference
oldTime_ms = currentTime_ms()
print("initialization done")
#Run forever
while True:
#If system is turned on by switch, run program
display.off()
if on_off.read() or True:
print("System started")
#Make sure no old values are stored
flagPhotoSensor = False
camera.camera.start()
#Stay in loop as long as system is turned on
while on_off.read() or True:
#If there is a product in front of camera, take a picture and record the time
if photoSensor.read(
) and not lastPhotoSensorValue and not flagPhotoSensor:
#img = camera.camera.get_image()
async_img = pool.apply_async(camera.take_image)
oldTime_ms = currentTime_ms()
#Save that photo sensor has been high
flagPhotoSensor = True
#If operator push button before IMG_SAVE_DELAY time, save image to not approved folder
#and blink red light once to inform operator
while deltaTime_ms(oldTime_ms) <= IMG_SAVE_DELAY:
if disallowed_img.read() and not lastOperatorBtnValue:
img = async_img.get()
threading.Thread(target=display.show_img,
args=(img, False)).start()
camera.save_img(img, False)
flagPhotoSensor = False
lastOperatorBtnValue = disallowed_img.read()
#if operator dont push button before IMG_SAVE_DELAY time run out, save
#image to approved folder and blink green light.
if (deltaTime_ms(oldTime_ms) >
IMG_SAVE_DELAY) and flagPhotoSensor:
img = async_img.get()
threading.Thread(target=display.show_img,
args=(img, True)).start()
camera.save_img(img, True)
flagPhotoSensor = False
camera.camera.stop()
lastPhotoSensorValue = photoSensor.read()
