ssControl.py

import gphoto2 as gp #NOT NECESSARY
import subprocess
from time import sleep
import serial

#this funtions uses linux terminal to auto detect attached camera
def detect_cam():
	detect = subprocess.Popen(["gphoto2", "--auto-detect"], stdout=subprocess.PIPE)
	print detect.communicate()[0] + "Connection Successful"
	pkill = subprocess.Popen(["pkill", "-f", "gphoto2"], stdout=subprocess.PIPE)
	print pkill.communicate()[0]

#the iso setting variable has to be one of the array position; 
#[100,200,400,800,1600,3200,6400,12800,25600] -> [0,1,2,3,4,5,6,7,8]
def set_iso():
	isoSet = subprocess.Popen(["gphoto2", "--set-config", "iso=0"], stdout=subprocess.PIPE)
	print isoSet.communicate()[0] + "ISO set"

#the shutter speed as well operates using the array position, thus the value for
#this exposure setting is 
def set_shutter_speed():
	ssSet = subprocess.Popen(["gphoto2", "--set-config", "shutterspeed=41"], stdout=subprocess.PIPE)
	print ssSet.communicate()[0] + "Shutter Speed Set"

#simple function for triggering the capture mode of the camera
def capture():
	cap = subprocess.Popen(["gphoto2", "--capture-image"], stdout=subprocess.PIPE)
	print cap.communicate()[0] + "T"

# file-selector
f = open("cameraAPI/text.txt","r")
	
# serial setup; "sudo chmod 666 /dev/ttyACM0" this code has to be written on terminal
#in order to access the port to which the arduino is connected
laserElectronics = serial.Serial(
	port = '/dev/ttyACM0',
	baudrate = 9600,
	timeout = 5
)

detect_cam()
set_iso()
set_shutter_speed()
capture()

# transmit to Arduino
for line in f:
	laserElectronics.write(line.encode())
	sleep(2)
f.close()


while(laserElectronics.in_waiting < 3):
	continue

response = (laserElectronics.read(laserElectronics.in_waiting).decode())

if(response == "ACK"):
	print("acknowledgement received")